ilovepdf_merged-compressed.pdf Refrigeration Exam Questions PDF

1. Two kilogram of gas is confined ina 1 m^3 tank b)Superheated temperature 200kpa and 88degC. What type of gas is in the c) Critical temperature tflnk? d) Dew point temperature a). Helium...

1. Two kilogram of gas is confined ina 1 m^3 tank b)Superheated temperature 200kpa and 88degC. What type of gas is in the c) Critical temperature tflnk? d) Dew point temperature a). Helium b). Ethane 8. Any refrigerant that exists asa liquid under c). Methane normal atmospheric pressure and temperature d). Ethane must be vaporized in an evaporator undera pressure below atmospheric. This is sometimes 2. In Refrigeration, how do you call a heat referred to as: exchanger in which low-pressure refrigerant a) Halogenated refrigerant boils or vaporizes, thus absorbing heat that was b) Freon refrigemnt removed from the refrigerated area by the c) Vacuum refrigerant cooling medium (water)? d) Halocarbon refrigerant a) Evaporator b) Chiller 9. It is any one ofa group of refrigerants that have c) Cooler been developed since about 1925 to overcome d) Flooded Evaporator the irritating or toxic effects of refrigerants, such as ammonia and sulfiir dioxide and the 3. It isa type of refrigeration system where only high condensing pressures required with carbon part of the circulated refrigerant is evaporated, dioxide. How do you call these refrigerants? with the remainder being separated from the a) Halogenated refrigerants vapor and then reciiculated. How do you call b) Freon refrigerants this system? c) Vacuum refrigerants a)Absorption refrigeration system d) Halocarbon refrigerants b) Vacuum refrigeration system c)Vapor-compression refrigeration system 10. This refrigeration system component combines d) Flooded refrigeration system the functions of a cooling tower and a condenser. It consists ofa casing enclosinga 4. How do you call the mixtures or substances that fan or blower section, water eliminators, are used in laboratory methods of producinga refrigerant condensing coil, water pan, float dmp in temperature? The most common valve, and spray pump outside the casing. How example is the mixture of iceand salt. do you call this component? a) Calorific mixture a)Water-cooled condenser b) Water-ammonia mixture b) Evaporative condenser c) Frigorific mixture c) Atmospheric condenser d) Hygroscopic mixture d) Chiller 5. Which ofthefollowing isa scale of temperature 11. It refers toa factor used incalculating the over- in which themelting point of ice is taken as0 o all heat transfer through the tube walls ofa and the boiling point of water is 80o? condenser tube or other heating surface. It a)Reaumur Scale includes the sum of the heat transfer rate of the b) Carrene Scale layer of dirt and foreign material that builds up c) Genetrnn Scale on the water side of the tube. What is this d) Frigorie Scale factor? a) Cooling factor 6. What is the amount of heat energy required to b) Contact factor raise the temperature of one pound ofwater one c) By-pass factor degree Fahrenheit? It is 1/180 of the heat d) Fouling factor required to raise the temperature of one pound of water from 32 to 212 oF at constant 12. It isa refrigeration system evaporator which is atmospheric pressure of 14,696 psi absolute. arranged with a tank or a single drum a) Specifc heat (accumulator) located above thecoil so that the b) British thermal unit inside of.the evaporator is full of refrigerant. c) Calorie How do you call this type of evaporator2 d) Sensible heat a) Flooded_evaporator b) Dry evaporator 7. It the nmmum tempemture ofany gasorvapor c) Cooing coil evaporator at which it may be condensed intoa liquid; d) Headered coil evaporator above this tempemture, it is impossible tO condense regardless of the pressure applied. 13. What is the standardized temi used by the How do you call this temperature? industry to describe any device that meters or a) Saturation temperature ME 430 ME Practice with Comprehensive Examination Pagei of3o CamScanner  i‹› « ‹I) ”I h«y can i›nIy rte filtc‹l ‹›n Iriw prc4xurc xlcnm eynlcmx 21.What lire ll›c tnninci›nsi‹Icr»ii‹›nx f‹ir slcam trahi csIcclii›n’/ 14. I3cliltcu “c‹›i1lr‹›l Yalvc“. h) Air v«nIing, plam pcrfrirmarx:c, ftr›w fi) 1t VEîÎltO Nùt y\l1 Îlyÿ NCfj|0 fy{“ )|ytj ÿ‹Ijylr‹jI c«px«ity xn‹l rolinhilily üÿ' IûIfl iit ‹1Ftl.Ur t‹› ‹›htfIilt t|1¿ r¿qjj rtjt| «) L'‹›nn«oIi‹›ns ct›n‹lili‹›t› ‹IQ ’I”hc map mu iI be Ihc same tixc a» the *) *”!*^ quenlity Nr c‹›l1‹liIi‹›lt ‹›l'tlic c‹›tttr‹›Ilc‹l oc›n‹lcnsalc drnin line lt1c‹lium c) The l1‹›w t›r prcxxuru i›l'thc.xlcilln (‹›r l)uitIj 22. ¢'xn temperature-t:‹›nIr‹›llcJ a l›catir›n« bg hcing mnt\iytilntc‹l ) ’Sl1C VülVC III ÎÑU t£ïnÎrtîllÿçt ¿jyn€Îjti‹yn u) ’Frapx xh‹iuIJ n‹›t rte fittcd undm any aClua!lY ITtaintnin«tl un‹lcr xlca‹Jy ktgtc circumxtanc:u'î cnnditit›ns It) Only iF Ihurc is n‹› Iif\ after the trap c) lfthu prc»nuru c›n the trap is always higher IS.A pnuumatic icmycraturc c‹›ntr‹›I is uscd ‹›n the than hackpr«»ur« slcam supply toa nc›n-ntc›ragC hCa( cxchangur d.}Pumyn h‹›uld always he fitted tr› r«move that hcats water scrving an nfïicc h«ating cundcnsalu system. What is referred to as manipu[atcd variahle"? 23. What arcihcmain considerations for steam cap a) The water bcing hcatcJ b) The air signal From thc cnntrollcr t‹› tho valve aclualor b) Air venting, plant performance, flow e) The steam supplier capacity and reliability d) The temperature of the air being hcated c) Conncctions d} The trap must be the samc size as the l6. How do you classifya solenoid valve? condensate drain line a)A thermal valve b)A magnetic stop valves 24. Can temperature-controlled applications be c)A bellows valves d)A bi-metallic valve a) Traps should not be fitted under any eircumstances l7. What isa thermostat? b) Only ifthere is no lift after the trap a)A temperature-operated switch c) Ifthe pressure on the trap is always higher b)A pressure-operated switch than backpressure c)A superheat-operated switch d) Pumps should always be fitted to remove d)A back pressure-operated switch condensate l8. Which ofihefollowing is the one of the main 25. Unless they are designed to flood, what is ihe purposes of refractory ina boiler furnace7 important when removing condensate from heat a) Help preheat the airfor the furnace exchangers'* b) Help preheat the feed water a) Condensate is allowed to sub-cool before c) Protect economizer from excessive heat reaching the trap d) Prevent excessive furnace heat losses b) Condensate is removed at steam temperature 19. Balance pressure traps are what type of steam e) Condensate should back-up into the steam trap? pipe a) jtermodynamic d) That thetrap is fatted level wiih or above b) Mechanical theheater outlet e)Thermostatic d) They do notbelong to any specific type of 26. How is flash steam produced? trap family a) From condensats passing from high to low pressure systems 20. What is a characteristic feature of b) From saturated steam thermodynamic steam traps’/ c) From superheated steam a) They pass condensate atsteam temperature d) Prom steam mixed with high tempemture b) They operate by holding back condensate air until it has cooled ME d3o MB Practice with Compréhensive Rxaminatinn ragea or3o CamScanner  b)With make-up water totheboiler feed tank c) With condensate entering the boiler feed tank b) Only when thetrap has passed all the d) All items a, b,& c condensate e)Air should be removed assoon asit reaches 35. Why should strainers installed on steam lines be the tmp fitted on lheir sides† d) Only on high pressure steam system a) To prevent the build-up of water in the strainer body 28. How do you call a system employing open b)To trap more dirt sprinklers attached to a piping system c) To reduce the frequency of cleaning connected toa water supply through which is d) To provide maximum screening area for opened by the operation ofa fire detection the steam system installed in the same areas as the sprinklers? 36.What is the result of usinga heat exchanger a) Mechanical sprinkler rating to calculate its steam consumption? b) Automatic system a) The tiue connected heat load may be c) Wet pipe system different from therated figure. d) Deluge system b) The rating does not take account of the temperature of the secondaiy medium 29. What is probably the first consideration when c)The rating is based ona steam pressure of selectinga control system? 1.0 bar a) What degree of accuracy is required? d) The rating does not allow for condensate b) 1s the control for heating or cooling? forming in the heat exchanger c) Isa two or three port valve required? d) ln the event of power failure, must the 37.A heat exchanger hasa design rating based on valve fail-open or fail-closed? a working pressure of7 bar g. What would be the effect of supplying the exchanger with 30. When adding the refrigerant ina refrigeration steam at3 bar g? system, it shall be charge into which of the a) The heat output would be greater because following parts of the system? the enthalpy of evaporation at3 bar g is a) High pressure side higher than at7 bar g. b) The heat output would be greater because b) Low pressure side steam at 3barg hasa greater volume than c) low- and high-pressure side steam at7 bar g. d) Compressor discharge line c) less weight of steam would be required because steam at3 barg hasa higher enthalpy 31. Why is a boiler feed tank heated to of evaporation than7 bar g. approximately 85 oC? d) The output would be reduced because the a) To reduce the energy required to raise difference in temperature between thesteam steam and produGt is reduced. b) To reduce the content of total dissolved solids in the water supplied to the boiler 38. For any particular tank temperature how does c) To reduce thegas content of the water the heat loss from the lid of a closed tank d) To reduce the content of suspended solids compare with that of bottom? in the water a)They areapproximately double those from thebottom 32. What is used todry air? b) Losses from the top are approximately a) A separator double those from thebottom b)A strainer c) losses from thebottom areapproximately c) A steam traps double those from thetop d) A tee pieces d) losses from the top are approximately4 times those from thebottom 33. What causes water hammer intheboiler? a) Suspended water droplets 39. What is the disadvantage of heatinga tank by b) An air/water mixture direct steam injection? c) Strainers fitted on their sides a) It agitates the solution d) Slugs of water in the steam b) Some oftheenthalpy of water is used c) Steam traps are not required 34. How does air entera steam system? d) It dilutes the tank content a)Through joints, Oil Shut down ofthesteam system ME 43 ME Practice ss5th Comprehensia'e £ xamination Page3 of3o CamScanner 40. you are assigned as Enginecr, must bc rcplaced. b) Dry-Bulb temperature Which ofthefollowing types most likcly to be c)Range installcd† d)Appronch a) Screw chillcr b) Scroll Chillcr 46. It isa space, or several rooms, or units of space c) Reciprccating cliillcr having some sort of coincident loads or similar d) Ccnlrifugal cliillcr operating characteristics. It may or may not be an enclosed space, or it may consist of many Nole: Centrifugal cliillcrs rire geticrally pañitioned rooms. How do you call this? sclccted for their high coefficient of a) Zone performance, good part-load pcrfonnnnce, b)Room and cooling capacity. Tlic econoinics of c)Space lai ge-scale applicalions (sucli as hospital) d) Plenum geiierally favor more efficicnt machines sueh cenlrifusäl 47.Inair conditioning, it indicates eithera volume CllÎllcrs. In this case,a centrifugal chiller is ora site withouta partition or a partitioned also the only one of the types listed that can room orgroup of rooms. How do you call this? provide the needed capaeity. a) Zone b)Room 41. Refrigeration condensers are rated based upon c)Space their ability to reject the total heat that cornes d) Plenum from which ofthefollowing? a) Compressor work and net refrigeration 48.It is an enclosed or partitioned space that is effect usually treated asa single load. If conditioned, b) Superheating it often has an individual control system. What e) Subcooling is this? d) Compressor work a) Zone b) Room 42.A published ‘U’ value froma steam coil toa water-based solution is given as 550 — 1300 c) Space W/m2-oC. When would be figure near the d) d) Plenum lower end of therange be used? a) When thesteam is known tobe ofgood 49. It represents the rate, in Btu/hr or W, at which quality heat entersa conditioned space from an external b) For short coils source or is released to the space from an c) For small diameter coils internal source duringa given time interval. d) When scaling or fouling of the coil takes a) Space heat gain place b) Space cooling load c) Space heating load 43. Steam coils should enter and leave the top ofa d) Space heat extraction rate tank when: a)The tank containsa corrosive solution 50. It is the rate, in Btu/hr or W, at which heat must b) When agitation of the tank solution is be removed froma conditioned space so as to required maintaina constant temperature and acceptable c) When steam locking the trap draininga relative humidity. Its sensible load component base coil could occur is equal to the sum of the convective heat d) When good heat distribution is required transfer from the surfaces of the building envelope, furnishings, occupants, appliances, 44.A tank is to be heated by direct steam injection. and equipment. How do you call this? How will the quantity of heat required compare a) Space heat gain with steam coil heating? b) Space cooling load a) It depends on thetemperature of the water c) Space heating load being heated d) Space heat extraction rate b) More heat will be required c) The same amount ofheat will be required 51. An Engineer claims to have createda heat d) less heat will be required engine that produces 15 kW of power for a 20- kW input while operating between energy 45. Which of the following parameters has the reservoirs at 37 oC and 400 oC. Is the greatest? limiting effect on the thermal Engineer's claim valid? performance of an open, evaporative cooling a) Valid tower? b) Not valid a)Wet-Bulb temperature c) Probably ME 43 ME Practice with Comprehensis'e Examination Page4 ofgo CamScanner  d) May be valid c)Bone-dry-weight d) Gross weight 52.A process that the body uses to convert energy in food into heat end work, or it is the process 60.What is the advantage of a pressurized that determines the rate at which energy is deaerator oven an atmospheric deaerator? converted from chemical to thermal form a)A boiler feed tank is no longer required within the body. b) less over all energy will be required to a) Metabolism produce thesteam b) Eating c) It can be fitted at ground level c) Body food processing d) It removes more oxygen. d) Blood circulation 61. In proximate analysis, the coal analysis is 53. What is a body insulation that is usually consisting of moisture content, fixed carbon, described asa single equivalent uniform layer ash, and which ofthefollowing? over the whole body? a) Sulfur a) Skin b) Hydrogen b) Blood c)Nitrogen c)Clothing d) Volatile matter d) Water 62. How do you call the heating value of the fuel if 54.What is ihe insulating value of clothing? the water intheproducts ofcombustion is in the a) Btu unit liquid state? b) Clo units a) Higher heating value e) Calorie unit b) lower heating value d) Frigorie Unit c) Proximate heating value d) Gravimetric heating value 55. What is the basic index used to describe the radiant conditions ina space, it is the mean 63. What is the rate, in Btu/h or W, at which heat temperature of an individual; exposed surfaces must be added to the conditioned space to in the environment? maintaina constant temperature and sometimes a)Index temperature a specified relative humidity? b) Mean radiant temperature a) Space heat gain c) Space temperature b) Space cooling load d) Dry bulb temperature c) Space heating load d) Space heat extraction rate 56. In order to avoid cavitation ina centrifugal pump, which ofthefollowing is true? 64. Space heat extraction rate 9e.r, Btu fh (W), is a) Installation NPSH is greater than or equal the rate at which heat is actually removed from pump NPSH the conditioned space by the air system. Its b)Installation NPSH less than or equal pump sensible heat rate component is equal to the NPSH sensible cooling load only when thespace air c)Installation NPSH < pump NPSH temperature remains constant. d)Installation NPSH should be negative a) Space heat gain 57. What always accompanies an isentropic b) Space cooling load expansion of steam? c) Space heating load a) An increase in entropy d) Space heat extraction rate b) An increase in enthalpy 65. It is the rate, in Btu/h or W, of heat transfer at c)A decrease in entropy the coil. Its cooling load component is the rate d) A decrease in enlhalpy at which heat is removed by thechilled water 58. Those substance that are particularly variable in flowing through the coil or is absorbed by the the moisture content that they can possess at refrigerant inside the coil. What do you call different times. this? a) Wet materials a) Coil load b) Hygroscopic materials b) Heating coil load c) Gross materials c) Refrigerating load d) Bone-dry-weight material d) Coolin8 load 59. The hygroscopic moisture content of a 66. It is the rate, in Btu/hr or W, at which heat is substance expressed as a percentage of the added totheconditioned airfrom thehotwater, bone-dry-weight of the material. steam, or electric heating elements inside the a) Moisture content coil. b) Regain a) Coil load ME 43º ME Practiœ with Comprehensive Examination Page5 ofpo CamScanner  b) Heating coil load 72. It 1Sä bitumifioUs coal that contains plenty of c) Refrigerating load hydrocarbons, Vorming lumped masses when d) Cooling load bumed. This coal is ideal for forming carbonaceous gases for reduction of ore. What 67. absorbed by lhe refrigerant et the evRpOrator. do youcall this coal7 For central hydronic systems, it is the sum of a) Coking orcoking coal the coil load plus the chilled water piping heat b) Free buming coal gain, pump power heat gain, end storage tank c) Peat coal heat gain. For most water systems in d) lignite coal conunercial buildings, the water piping and pump power heat gain is only about5 to 10 73. It is the temperature at which theoil vapors will percent of the coil load. In an air conditioning continue to bum when ignited. system using DX coil(s), it is equal to the DX a) Fire point coil load. b) Flash point a) Coil load c) Ignition temperature b) Heating coil load d) Creep temperature c) Refrigerating load d) Cooling load 74. It is the temperature to which oil has to be heated until sufficient flammable vapor is 68. It isa humidity sensor used to measure relative driven off to fiash when brought inio humidity, dew point, or absolute humidity of momentary contact witha flame. How do you ambient or moving air. This device could be call this temperature? mechanical or electronic. How do you call this? a) Fire point a) Hydrometer b) Flash point b) Hygrometer c) Ignition temperature c)Psychrometer d) Creep temperature d) Barometer 75. The color ofa lubricating oil is obtained by reference to transmitted light; the color by 69.It isa device designed to control the flow of reflected light is referred to as: steam, water, gas, or other fluids. It can be a) Bloom considereda variable orifice positioned by an b)Reflection acmator inresponse to impulses or signals from c) Deflection thecontroller. It may be equipped with eithera d) Residue thronling plug, V-port, or rotating ball specially designed to provide a desired flow 76. How do you call the material left after heating characteristic. How do you call this device? an oil under specified conditions at high a) Automatic Valve temperature, and is useful asa quality control b) Automatic flow meter tool in the refining of viscous oils, particularly c)Thermostat residual oils7 d) Pyrometer a) Ash b) Color 70.Assume that you are checking thewater level in c)Carbon residue a boiler which is on the line ina power plant. d) Coke Upon opening the gage cocks, you determine that the water level was above the top gage 77.Petroleum oils, when cooled, may become cock. Of the following actions, the best one to plastic solids, either from wax formation or take first in this situation would be to: from thefluid congealing. With some oils, the a) Shut-off the fuel and air supply initial wax crystal formation becomes visible at b) Surface-blow the boiler temperatures slightly above the solidification c) Close the steam outlet valve from the point. When that temperature is reached at boiler specific test conditions, it is known asthe d) Increase the speed of the feed water a)Cloud point 71. It isa component ina hydro plant that absorbs b) Pour point water hammer during load fluctuations and c) Creep point serves as an auxiliary reservoir during high load d) Flash point demands. What is this component† a)Spillway 78. It is the tempemture at which cooled oil willjust b) Dam flow under Specifc test conditions; and it c) Surge tank indicates the lowest temperature at whicha d) penstock lubricant can readily flow from its container. How do you call this temperature† a) Cloud point M 430 ME Practice with Comprehensive Examination Page fi of 3o CamScanner  b) Pour point c) Creep point 85s What fr the molecular attraction of layers of an d) Flash point unlike matter† a) Adhesion 79. lt isa term indicating the measure of acidic b) Cohesion components inoils; and was original intent to c)Advectiori indicate the degree oftefining in new oils, and d) Convection lo follow the development of oxidation in service, with its Affects on deposit formation 86. How do you call tkcse engine oilsdditives used and corrosion. What is this? toprevent attack on iron and steel surfaces by a) Neutralization number condensed moisture and acidic corrosion b}Total base number products, aggravated by low-temperature siop- c)Total acid number and-go operation? d) Neutralisation number and total aeid a) Detergents number b) Dispersants c) Oxidation inhibitors 80. How do you call a measure of alkaline d) Rust inhibitors components in oils, especially those additives used in engine oils to neutralize acids formed 87. How do you call these engine oil additives used during fuel combustion? to help enable adequate low-temperature flow, a) Neutralization number along with sufficient viscosity at high b)Total base number temperamres? c)Total acid number a)Viscosity-index improvers d) Neutralization number and total acid b) Pour point dispersants number c) Oxidation inhibitors 81.These are materials with low coefficients of d) Rust inhibitors friction compared tometals, and they areused to reduce friction and wear ina variety of 88. These oil additives are used to minimize wear applications. There area large number ofsuch under boundary lubrication condiüons, such as materials, and tiiey include graphite, cam and lifter, and cylinder-wall and pision- molybdenum disulfide, ring surfaces. polytetrafluoroethylene, tale, gmphite fluoride, a) Anti-wear additives polymers, and certain metal salts. How do you b) Pour point dispersants call these materials? c) Oxidation iöhibitors a) Greases d) Rust inhibitors b) liquid lubricants c) Solid lubricants 89. These areengine oil additives used toallow air d) Powder lubricants to break away easily from theoil. 82. These areengine oil additives used tohelp keep a) Anti-wear additives theengine clean by solubilizing and dispersing b) Defoamants sludge, soot, and deposit precursors. How do c)Oxidation inhibitors you call these oil additives? d) Rust inhibitors a) Detergents b) Dispersants 90. These engine oil additives are used to improve c) Oxidation inhibitors fuel efficiency by reducing friction at mbbing d) Corrosion inhibitors surfaces. How do you call these oil additives? a) Anti-wear additives g3. How do you call thèse engine oil additives used b) Friction modifiers toprevent attack on sensitive bearing metals† c) Oxidation inhibitors a) Detergents d) Rust inhibitors b) DispersantS c) Oxidation inhibitors 91. How do ypu call an opening where hot source d) Corrosion inhibitors of energy from theearth is hamessed? gd. }tg arg engine oil additives used to prevent b) Hot water source or reduce depoSÎtS and corrosion by neutmlizing c) Fumamle combustion bypmdMt 8Cida. Et are thèse d)Vo1cæoopeWng additives? 92.Thespeed of sound is also called as: a) Detergents a) Sound velocity b) Dispersants b) Acoustic velocity c) Oxidation inhibitors c) Subsonic velocity d) Corrosion inhibltOFS d) Critical velocity Mg ,goo Mg Practiœ u'itb CozapTebensiTe 6xamîoatioa Page 7of3o CamScanner  and marked indicating its rejection. How do '* is the velocity at whiche small pressure you call this boiler7 wave moves througha fluid. How do you cell a) Second hand boilet this velocity† b) Reinstalled boiler a) Sonic velocity c) Condemned boiler b) Subsonic velocity d) Unfired boiler c) Supersonic velocity 101. Neme one characteristic feature of d) Hypersonie velocity fflechanicftl steam traps. 94. What cen you say about entmpy in llie e) They pass condensate at steam temperature universe? b) They operate by sensing condensate s) Entmpy is always increasing temperature b) Entmpy is decreasing c) They canbe fitted into any position c) Entropy will zero at the end of lime d) They arenotaffected by increasing back dl Entropy is stagnetin9 pressure Pressure Vessels, it is any boiler which does not exceed any of the following limits: 405 mm 102. Ina mechanical steam trap, why isa float inside diameter. 1065 mm overall length of trap better at venting air than an inverted outside-to-outside heats at center, 1.85 m2 of bucket tnp7 u'aier heating surface, and 7.03 kg/cm2 a)A float can quickly adjust to the presence maximum allowable working pressure. What is of air this boiler? b)A float is fitted with an automatic air vent a) Power boiler c)A float trap does not vent air better than b) Portable boiler bucket trap c) Miniature boiler d) The air vent orifice is adjustable ona float d) locomotive boiler trap 96. It isa closed vessel in which steam or other 103. Ina mechanical steam trap, whai added vapor (to be used externally to itself) is benefit does theautomatic air vent offer toa generated by the direct application of heat used float trap7 for power generation. How do you call this a) It stops the trap from freezing in cold boiler? weather a) Power boiler b) The trap can be use on larger b) Portable boiler backpressures e) Oil-fired boiler c) It significantly increases the cold start-up d) Miniature boiler capacity of the trap d) The condensate orifice can be the same 97. It isa closed vessel intended for use in hearing size for all pressure gauges water of for application of heat to generate steam or another vapor to be used externally 104. Ina mechanical steam trap, what advantage from it. What do you call this pressure vessel? doesa bucket trap have overa float type? a) Boiler or steam generator a) It is able to withstand water hammer b) Fired pressure vessel b)It can be used on higher pressure c) Unfired pressure vessel c) It can discharge air freely d) Pressurized tank d) It cannot lose its water seal qg. What do you calla vessel in which pressure is 105.A heat exchanger is designed to operate obtained from external sources, or from an without waterlogging of the steam space. indirect application of heat? What is the usual choice of trap for its a) Boiler or steam generator drainage? b) Fired pressure vessel e)Thermostatic trep c) Unfired pressure vessel b) Inverted bucket trap d) Pressurized tank c) Thermodynamic trap gg. installed, placed in operation but subject to d) Float trap with thermosiatic air vent annual inspection. What do youcall this? 106. Which is the best trap to use when steam a) Miniature boiler locking can occur7 b) Existing installation a) An inverted bucket trap with an internal c) new boiler check valve mechanism d) Portable boiler b)A balanced pressure steam trap c)A float trap with automatic air vent 100. It isa boiler that has been inspected and d) A float trap with steam lock release declared unsafe to operate or disqualified, mechanism Mg 43o MB Practice with Comprehensive Rnaminatiori Page8 ofso ' CamScanner  107. What isa common cause of water-hammer boiler of welded construction shall not indrying coils? exceed towhich of thefollowing pressures? a) Wet steam supplied io the coil a)1 atmosphere b) Too low a steam pressure onto thecoil b)1 Bar c) Condensate has to lift aller the steam trap c) 100 kPa d) The coil falling in the direction of steam d)2 gage pressures 115. What do you calla refrigeration system in 108. Which ofthefollowing statements is lure? which the refrigerant gas evolved in the a) Bimetallic steam treps are an ideal choice evaporator is taken up in an absorber and forrotating cylinders released ina generator upon theapplication b) Rotating cylinders cannot suffer from of hent7 steam locking a) Absorption refrigeration system c) Strainers cannot be fitted to float traps b) Cascade refrigeration system which havea steam lock release c) Flooded refrigeration system d) Air vents around the thermodynamic and d) Steamjet refrigeration system inverted bucket traps can considerably 116. What do youcalla shut-off valve other than improve start-up times a valve for controlling the flow of refrigerant ina refrigeration system? 109. Name theprincipal cause of water-hammef? a)Fusible valve a) Water particles suspended insteam b) Stop valve b) Water allowed to build up in pipes c) Check valve c) Water droplets carried along the insides of d) Relief valve pipes d) Wet steam passing through steam traps 117. Wtiat is a device, used in refrigeration system, having a predetermined 110. What effect does steam locking have on temperature fusible member forthereliefof rotating machinery? pressures† a)None atall a) Fusible valve b) It reduces the drying rate of drying b) Stop valve cylinders c) Check valve c) It increases the drying rate of drying d) Reliefvalve cylinder d) It causes the steam trap to air bind 118. It isa measure of the lack of potential or quality of energy; and once that energy has 111. What do you calla boiler of which both the been exchanged or converted, it cannot location and ownership have been change revert back toa higher level. What is this? after primary use? a) Specifc heat a) Second hand boiler b) Entropy b) Surplus boiler c) Internal energy c) Miniature boiler d) Molecular energy d) Reinstalled boiler 119. What do you call the method used to 112. It isa boiler removed from its original evaluate all welds performed on pressure setting and re-erected at the same location parts of boiler tube materials? or erected ata location without change of a) Radiographic test ownership. How do you call this boilef? b) Hydrostatic test a) Second hand boiler c) Vacuum test b) Surplus boiler d) Orsat analysis c) Miniature boiler d) Reinstalled boiler 120. It isa boiler testing method that is used to verify the microstnieture of the boiler tubes 113. Each miniature boiler shall be equipped using optical microscopes. How do you call with which of the following for the this method? determination of water level? a)Tube sampling a) Safety valve b) Metallurgic replication b) Fusible plug c) Radiographic testing c) Water gage glass d) Optical testing d) Pressure gages 121. Which ofthefollowing is true regarding the 114. The maximum allowable working pressure relation of rk and re for spark-ignition ofa non-code steel or wrought iron heating ME q3o ME Pra‹nioe with Comprehensive Examination Pageg ofso CamScanner  engine, where rk = compression ratio while 128.It is an upward force that is exerted on an re = expansion ratio7 object (like flat plate, airfoil, rotating a) rk > re cylinder, etc.) as the object passes througha b) rk < re fluid. What do you call this7 c) rk = re a) Drag d) re is not considemd in the spark-ignition b)Lift engine c) Aero horsepower d)Terminal velocity 122. It is the generic term given toa family of solid fuels with high carbon content. How 129.What isa frietional force that acts parallel do you cull this? but opposite to the direction of motion of a) Solid fuel fluid? b) Coal a) Drag e)Anthraeite b)lift d) Bituminous c) Aero horsepower d)Terminal velocity 123. It isa boiler fuel created from theresidue produced from crude petroleum after it has 130.lt is a term used by automobile been distilled to produce lighter oils like manufacturers to designate the power gasoline, paraffin, kerosene, diesel or gas required to movea carhorizontally at 50 oil. What is this fuel? mi/hr against the drag force. What is this? a) Oil a) Mechanical horsepower b) Kerosene b) Aero horsepower c)Coke c)Fuel power d)Peat d)Fluid power 124. What do you calla form of boiler fuel that 131.A manufacturer claims that it has a COP of is easy tobum, with very little excess air? 2.0 when coolinga food at5 oC using a) Coal ambient air at 30 oC asa heat sink 1sthe b)Oil claim of themanufacturer valid? c)Gas a) Yes d)Bunker b) No c) Probably 125.The second law of thermodynamics says d) It needs experimental verification that whenever Note: Yes, because the claimed COP of the energy is exchanged orconverted from one form manufacturer is lower than the COP of tO Carnot Refrigeration another, the potential for energy todo work will be 132.What can you sayabout thevelocity of fluid at the center of the pipe section? a) Decreased a) Maximum b) Increased b)Minimum c) Zero c)Average d) Stagnant d) Zero 126.What is true about steam as it condenses? a) It does so at constant entropy and 133.Continuity equation is applicable to which temperature ofthefollowing? b) It does so at constant enthalpy and a) Viscous and unviscous fluids reducing temperature b) Compressibility fluids c) Both enthalpy and entropy reduce and c) Conservation of mass temperature remains constant d) Steady and unsteady flows d) Both enthalpy and entropy increase 134.Hygrometer is an instrument used to 127.lt is an increase in fluid pressure ina long determine of which ofthefollowing? pipe caused bya sudden velocity decrease, «› p i s=*itr°f i where the sudden dœrease invelocity is b) Specifc gravity of gases caused bya valve closing. c) Specifc gravity of liquids a) AerO dyitamics d) Specifc gravity of solids b)Water hammer c)Terminal velocity 135.At critical point ofa pure substance, what is d) Drag the value of latent heat? a) Maximum Me d3oME Practice with Tomprehensive Exaniination Page io ofao CamScanner  and expressed as horsepower. How do you call this? a) Indicated Hp b) Brake Hp note: Zero, atthe critical point hg - lif=0 c)Combined Hp 136.Which of the following isn function ofa d)Friction Hp steam nozzle† a) Converts kinetic energy into heat energy I d4.How do you calla device or engine which bl Changes internal energy into kinetic continually and indefinitely discharged energy more energy than it receives? *) Converts potential energy into heat energy a) Camot engine d) Changes enthalpic energy into kinetic b) Cienerating machine energy c)Stirling engine d) Perpetual motion machine 137.Generally, steam turbines in power station operate ai which ofthefollowing speeds7 145.In plotting the bHp versus speed ina wide- a) 3000 rpm open throttle test fora spark ignition engine, b) 1000 rpm the bHp curve: c)4000 rpm a) isa Straight line d)500 rpm b) tends to concave downward c)hasno characteristic shape 138.Tidal power is the power generated from d) tends to concave upward which ofthefollowing? a) Waves oftheocean 146.Upon entering the boiler room, you find the b) Thermal energy of ocean water water out of the glass, the safety valve c) Raw sea water blowing off strong, and a fire under the d) Rise and fall of tides boiler. Your first action would be to: a) Remove thefire with draft and damper 139.Which of the following is an expression or open equivalent of? b)Cool theboiler down completely horsepower per ton of refrigeration? c) Prevent priming by not raising the safety a) COP/ 4.715 valve or mal0ng change in operating of b) 4.715/ COP engines or boiler e) COP x 4.7IS d) Cool the boiler down completely and d) I/ (4.715x COP) prevent priming by not raising the safety valve 140.It is the ratio of the amount ofheat taken up bya substance to the temperature at which 147.The A.S.M.E. Boiler code forboiler shells thesubstance exists. How do you call this? requiresa tensile strength of which of the a) Internal energy following, in psi? b) Flow energy a) 10000 to20000 c) Enthalpy b)25000 to45000 d) Entmpy c)55000 lo63000 d)70000 to85000 141.Which of the following isa type of water turbine wherea jet of water is made tofall 148.The best time toblowa boiler down is: on the blades or buckets and due to the a) Oncea daywhen theload is lightest impulse of water theturbine starts moving? b) Oncea dayunder full load a)Reaction turbine c) When the chemical concentration is b) Steam turbine greatest c) Francis turbine d) Oncea shift d) Pelton wheel 149.In performing a hydrostatic test on an existing power boiler, the required test 142.What do you calla fan in which thefluid is accelerated parallel to the fan axis? pressure must be controlled so that it is not a) Axial centrifugal fan exceeded by more than: b) Mixed flow centrifugal fan a) 2% c) Radial centrifugal fan b) 4% d) Francis type fan c) 6% d) 8% 143.It represents the loss due to mechanical friction of the moving parts of the engine, 43 ME Practice w5th Comprehensive Examination Page ii ofgo CamScanner 150.The first step to take in planning a 158.A thermo hydraulic feed water regulator is preventive maintenance program is to: used toregulate the flow of water toa drum a) Replace all electric wiring type boiler. The amount ofwater input to the b) Make anequipment inventory hoilsr ie controlled in proportion to the: c) Replace all pump seals a) Boiler load d) Repair all equipment which is not in b) Setting of the feed pump relief valve operation c) Amount of water in the outer tube that flashes into steam 151.Which of the following is the most d) Water level in the drum important consideration ina fire prevention pmgreiu† 159.The standard capacity rating conditions for a) Train the staff to place flammable in any refrigeration compressor is: fireproof containers a) 5oF, 19.6 psig for the suction 86oP, 154.5 b) Know howtoattack fires regardless of size psig for the discharge c) See that halls, corridors, and exits are not b) 5oF, 9.6 psig for the suction 96oF, 154.5 blocked psig forthe discharge d) Detect and eliminate every possible fire c) l0oF, 9.6 psig for the suction 96oF, 144.5 hazard psig forthe discharge d) 5oF, 19.6 psig for the suction 96oF, 134.5 152.Which of the following types of portable psig for the discharge fire extinguisher is recommended as most effective for putting out oil fires? 160.In accordance with the air pollution control a) Pump tank type code, no person shall cause or permit the b) Cartridge actuated type emission of air contaminants froma boiler c) Soda acid type witha capacity of 500 million BTU sulfur d) Foam type dioxide content of more than: a) 300 parts per million by volume undiluted 153.Which of thefollowing are the four stages emissions measured at 15 percent excess of the warning system designated by the air high air pollution alert warning system? b) 200 parts per million by volume of a) Initial, chronic, acute, penetrating undiluted emissions measured at 10 b) Forecast, alert, warning, emergency percent excess air c)(light, medium, heavy, extra heavy c) 200 parts per million by volume undiluted d) Early, moderate, severe, toxic emissions measured at 15 percent excess 154.The chemical most commonly used tospeed d) 300 per million by volume undiluted sedimentation of sewage is known as: emissions measured at 10 percent excess a) Lime air b)Copper sulfate c) Sulfiiric acid 161.Assume that one of your assistances was d) Methylene blue near theFreon 11 refrigeration sysiem when a liquid Freon line ruptured. Some ofthe 155.Most of thebacteria in sewage are: liquid Freon 1l has gotten into your a) Saprophytic assistant's right eye. Of the folloivinp b) Dangerous actions, the one which you should not take c)Parasitic is to: d) Pathogenic a) Immediately call for an eye doctor specialist (medical doctor) 156.One of the two types of non-material b) Gently and quickly nib the FreonII outof nuclear radiation is: theeye a) Gamma radiation c) Usesa boric-acid solution to clean out the b) Transmutation radiation FreonII from his eye c) Walton radiation d) Wash theeyebygently blowing theFreon d) Betatron radiation 11 out of his eye with air 157.Which o(the following is nota qualification l62,As compared toa power-driven triples for an applicant for ME board examination† single-acting pump of thesame size and a) A certified plant mechanic opemting at the snme speed,a steam-driven b) At least 18 years Old duplex double-acting pump will: c)A holder of BSME degree a) Pump more water per minute d) A citizen of the Philippines b) Givea more uniform discharge c) Havea higher first cost ME 430 ME Practice with Comprehension Examination Page iz ofgo CamScanner  d) Be more economical to operate 170.The effectiveness ofa body asa thermal radiator ata given temperature: 163.It is a device commonly used to cool a) Absorptivity condenser water inPower andRefrigeration b) Emissivity plants. The function of which is to reject c)Conductivity heat to the atmosphere by reducing the d) Reflectivity temperature of water circulated thmugh condenser or other heat rejection 171.To protect adequately lhe engine bearings, equipment. What is this device commonly what type and better arrangement of called† lubricating oil filter is most practical† a) Condenser a) Full flow type filter installed between the b) Cooler lubricating oil pump andbearings e)Cooling tower b) Splash lubricating system inthecrank case d) Evaporator c) Duplex filter installed before the lubricating pump 164.It isa type of dryer in which thegases of d) Bypass filter with cleanable and combustion pass through the spaces replaceable elements surrounding, or in other ways heating, the drying chamber, but the gases are not 172.When theexpansion or compression of gas allowed in contact with the material being takes place without transfer of heatt or from dried. What is this dryer? thegas, the process is called: a) Direct-heat type dryer a) Reversible b) Indirect-heat type dryer b) Adiabatic c) Steam-heated type dryer c) Polytrophic d) Rotary Dryer d) Isothermal 165.ln a refrigeration system, which of the 173.Which ofthefollowing is other name forthe following would cause a high suction liquid valve? pressure? a) Freon valve a) Expansion valve not open wide enough b) shut off valve b)Expansion valve open toowide c) King valve c)King valve not open wide enough d) Master valve d) Dirty dehydrator 174.In accordance with recommended 166.In the deep well installing or operation, the maintenance practice, thermostats used ina difference between static water level and pneumatic temperature control system operating water level is called: should be checked: a) Suction lift a) Weekly b) drawdown b)Bi-monthly c)priming level c) Monthly d) clogging d)Oncea year 167.Which ofthefollowing isa characteristic of 175.Of the following, the best methpd used to an impulse turbine? determine the moisture level in a a) Steam striking blades on angle refrigeration system is to: b) No steam reaction to velocity a) Weigh thedriver after it has been in the c) Steam striking blades atzero angle system fora period of time d) Steam reversing direction b) Usea moisture indicator c) Visually check thesight glass for particles 168.Gas produced by thecombustion of fuel oil of corrosion and cannot be found intheflue gases is: d) Test a sampler lubricating oil with a) Carbon dioxide phosphorus pentoxide b) Hydrogen c)Oxygen 176.A full-flow drier is usually recommended to d)Nitrogen be used in a hermetic refrigeration compressor system to keep the system diy 169.Scale in boiler can: and to: a) Create low steam quality a) Prevent the products of decomposition b) Cause foaming from getting into the evaporator in the c)Overheat blow offline event of motor bum-out d) Inhibit circulation and heat transfer ME 430 ME Practice with Comprehensive Examination Page ig of3o CamScanner  b) Condense out liquid refrigerant during b) Reduce thetotal power requirements and compressor off cycles and compressor return oil to the compressor start-up c) Improve theflow of evaporator gas per ton c) Prevent the compressor unit form and increase the temperature decreasing in capacity d) Increase the heat rejection per ton and d) Prevent the liquid from dumping into the avnid 9ystem shutdown compressor cr0nk-case 183.ln large refrigeration systems, the usual 177.You are supervising the installation of a location for chatgin8 the refrigeration steam-driven reciprocating pump. The system is into the: pump's air cliaNiher is @ssing andyou have a) Suction line to replace it with one of several salvaged b) Liquid line between the receiver shut-off ones. The salvaged air chamber selected valve and the expansion valve should havea volume equal to, most nearly, c) line between the condenser and the a) Half of the position displacement of the compressor pump d) line between the high-pressure cut-off b)l/ times the position displacement of the switch and the expansion valve c)2 times the piston displacement of the 184.The effect of a voltage variation to 90 P P percent of normal voltage, fora compound d)2 'Zi times the piston displacement of the wound DC motor, of the full load current is: a) Increase in the full load current approximately by 10% 178.Economical partial-load operation of steam b) Zero turbines is obtained by minimizing c)A decrease in the full load currern of throttling losses. This is accomplished by: approximately 10 Zo a) Reducing the boiler pressure and d)A decrease in the full load current 20% temperature b) Throttling the steam flow into the 185.The main advantage of operatinga steam uncontrolled setof nozzles engine or steam turbine “condensing” is that c) Dividing the first-stage nozzles into ii: several groups and providinga steam a) Increases the mean effective pressure inthe control valve foreach group prime mover d) Controlling the fiiel flow to the steam b)Decrease thecondensate temperature generator c) Permits the use of exhaust steam to drive aux.iliaiy equipment 179.How do you compare superheated steam to d) Eliminates the need for separating non- that of saturated steam atthesame pressure? condensable from thesteam a) Contains more heat energy b) Hasa greater enthalpy of evaporation 186.The automatic shui off valves fora water c) Has a smaller specific volume gage installed on a high-pressure boiler d)Condenses ata higher temperature must be: a)Horizontal swing-check valves 180.Which of the following is not a b) Vertical swing-check valves characteristic of superheated steam7 c) Ball-check valves a) It contains no water droplets d) Spring-loaded check valves b) It causes severe erosion in pipes c) It may cause uneven heating ofa product 187.The efficiency oLa riveted joint is defined d) It has a temperature greater than 165 oC as the ratio of the: a) Plate thickness to the rivet diameter 181.Superheated steam ata pressure of6 bar g: b) Strength the riveted joint to the strength of a) Has a larger Specife heat capacity than a welded joint water c) Strength of the rivetedjoint to the strength b) Hasa dryness fraction of 0.99 pf the solid plate c) Must notbeused asa heat transfer medium d) Number ofrivets d)Hasa temperature greater than 165 oC joint to the total number ofrivets on one side of the joint 182.Of thefollowing, the main purpose ofa sub- cooler ina refrigerant piping system fora 188.lt corresponds toa heat absorption rate of two-stage system is to: 237.6 Btu/min (4.175 kW) with inlet an a) Reduce thetotal power requirements and outlet pressures corresponding to saturation total heat rejection to the second stage temperature of 23 oF (-5 oC) and 59 oF (15 ME 43O ME Practice with Comprehensive Examination «r ^4»*s» CamScanner  oC), respectively. How do you call this a) Quick and easy tochange toheavy fuel oil absorption rate? when required a) American Unit of refrigeration b) Price of fuel b) British Unit of refrigeration o) Price of interruptible gas lower than fixed c) European Unit of refrigeration supply d) Standard Unit of refrigeration d) Convenience of supply 189.What is the advantage of an internRl water 196.At what pressure should a boiler safety level control over an external one? valve be set† a) The external cot\trol is ina ‘dead’ area a) Maximum working pressure b) It is less likely to scale up b) Normal working pressure c) lt will respond more quickly to changes in c) Hydraulic test pressure water level d) Feed pump maximum pressure d) Daily testing of the level control chamber is not required 197.What is the purpose ofa bottom blowdown valve7 190.What is the purpose of testing gauge a) To control water level glasses? b) To drain the boiler a) To ensure the gauge cocks areoperative c) To maintain TDS b) To ensure there is sufficient water over the d) To remove sludge top fire tube c) To ensure the boiler water level is being 198.How often, asa minimum, should gauge properly sensed glasses be tested? d) To check theboiler lst and 2nd low water a) Oncea shiB level alarms b) Twicea day c)Oncea day 191.What is the effect of an overloaded boiler? d)Oncea week a) Water level rises and lock-out occurs b) Reduced steam production 199.Why aretwo-gauge glasses often fitted? c) Water level drops and lock-out occurs a) One isa check against the other d) Steam velocity reduces and separator b) One isa reserve efficiency drops c) It isa legal requirement d) To increase periods between maintenance 192.Why is slow, controlled warm-up ofa steam system essential? 200.Temporary hardness salts are reduced by: a) To make it easier to open theboiler main a) Raising the water iempemmre stop valve b)lowering the water temperature b) To minimize undue stresses and eliminate c) Raising thepH value damage d) letting the water settle c To permit separators to remove more water d) To prevent stress on the boiler 201.What is the effect of CO2 in a steam system? 193.Which of thefollowing is the main purpose a)The formation of scale of the steam distribution manifold? b) The formation of sludge a) It replaces the need fora separator after the c) Corrosion boiler d) Acidity b) to remove air from thesteam system e)To provide an extra separating function 202.Which of thefollowing forms soft scale or d) It isa requirement of the pressure systems sludge? regulations a) Magnesium sulphate b) Sodium carbonate 194.Priming ofa boiler is: c) Sodium bicarbonate a) Gettinga boiler prepared forstart-up d) Calcium bicarbonate b) A reduction in boiler pressure and carryover of water 203.Which of the following are principal c) Occurrence of excessive TDS and dissolved solids that are scale forming? carryover of water a) Carbonates and sulphates of sodium d) Balancing of boilers in a multi-boiler b)Calcium bicarbonate installation c) Carbonates and sulphates of magnesium d)Bicarbonate of sodium and magnesium 195.What is the advantage ofintemiptibletariff? M 43 fl Practice with Comprehensive Examination raa s ofso CamScanner 204.What is the effect of temperature on calcium c) Regenerative heating and magnesium sulphates† d) Desuperheating a) They separate out as soil scale and sludge b) They precipitate out solution and form 21 t.What does MAWP stand for/ hard scale a) Maximum attenuated working pressure c) Foaming and carryover occurs b) Maximum allowable working pressure d) The TDS is increased c) Maximum allowable with pressure d) Minimum allowable working pressure 205.What is the treatment forscale forming salts in boiler feedwater7 212.Name one disadvantage ofa direct acting a) They arechemically treated to modify the pressure reducing valve. pH s) It only has proportional control b) The feedwater tank is raised to at least 83 b) It has proportional and integral control but OC fO c) They arechemically treated to produce derivative control suspended solids c) It operates in an o/off fashion d) They areremoved by filtration means d) An external power source is required for it to operate 206.Which of the following types of alcohol is the most frequently considered as fuel for 213.In order to avoid cavitation ina centrifugal internal combustion engine? pump, which ofthefollowing is true? a) Methyl alcohol a) Installation NPSHU pump NPSH b) Isopropyl alcohol b)Installation NPSHO pump NPSH c) Ethyl alcohol c)Installation NPSH < pump NPSH d) Alcogas d)Installation NPSH should be negative 214.It is dust removal equipment that consists of 207.Ina thermal plant, name thecomponents of a cylindrical tank structure provided witha a self-acting temperature control system. tangential opening at one end for gas a) Control valve and acmator passage anda spray manifold at the center b) Control valve, actuator and sensor which is made ofa vertical pipe attached c) Control valve, actuator, capillary tube and with spray nozzles where water is sensor introduced at the bottom of this spray pipe. d) Control valve, actuator and capillary tube The gas revolves around the cylindrical body asit enters the scrubber, and comes in 208.What is the purpose of over temperature contact with thewater spray, the dust flyash protection within the self-acting control is then wetted and hence separated from the system? gas leaves the scmbber at the top. a) To protect the valve from high temperature a) Cinder trap or catcher steam b) Cyclonie Spray Scnibber b) To protect the liquid fall in the capillary c) Cyclone Separator from boiling d) Electrostatic Precipitator c) To protect the control system from irreversible damage 215.What isa heat exchanger that allows cross d) To protect the application from contact between two media? This heat overtemperature exchanger allows the cooling water to dow by gravity over the outside of tubes or 209.Why are three-port self-acting control plates. valves used in an industrial steam ofa a) Single-pess heat exchanger thermal system? b) Double-pass heat exchanger a)To mix or divert liquids especially water c) Baudelot heat exchanger b) To dump steam to waste under fault d) Shell-and-tube heat exchanger conditions c) Where cooling applications are required 216.What is the recommended weight of the d) When large valves are required to meet machine foundation† large capacities a)3 to5 times the machine weight b)4 to6 times the machine weight 210.How do you call a process in which c)2 to4 times themachine weight superheated steam is either restored to its d)2 to4 times the machine weight saturated state, or its superheated temperature is reduced? 217.It isa bituminous coal that contains plenty a) Superheating of hydrocarbons, forming lumped masses b) Reheating when burned. This coal is ideal for forming ME d3o ME Practice with Comprehensix'e Examination Page i6 ofSo CamScanner  carbonaceous gases for reduction of ore. This dryer is used fordrying palay, wheat, What do youcall this coal? and grains. a) Coking or coking coal a) Rotary dryer b) Free burning coal b) Hearth dryer c) Peat coal c) Tower dryer d) lignite coal d) Tray dryer 218.It is an engine in which flue connecting rod is directly connected to the piston wrislpin. 224.How do you call those substances that are The side thrust caused by the engularity of particularly vaiiable in the moisture content the connecting rod is taken by the piston that they can possess at different times7 bearing against the cylinder wall. a) Wet materials a) Opposed-piston engine b) Hygroscopic materials b) Trunk piston engine c) Gross materials c) Crosshead engine d) Bone-dry-weight material d) 2-stroke engine 225,The bottom blows down ona boiler is used 219.Tt is an internal combustion engine wherein to: the ignition of the fuel is not accomplished a) Remove mud dnim water impurities solely by the heat developed from the b) Increase boiler priming compression of thecombustion air supplied c) Reduce steam pressure in the header but partly or entirely by other heat sources, d) Increase the boiler water level such as an uncooled tube, plate, bulb or an electric resistance coil. 226.Ina Brayton cycle or gas turbine cycle, what a) Spark-ignition engine do you call the heal exchanger that passes b) Compression-ignition engine exhaust heat to the compressed air, prior to c) Surface-ignition engine combustion? d) Dual combustion engine a) Reheater b) Recuperator 120.This is the condition ina geothermal plant c) Heater wherein the ground surface where the d) Heat exchanger drilled well is depressed or subsides due to depleting. What do youcall this? 227.The heat rejected by the working substance a) Ground subsidence to the regenerator in the Stirling cycle is: b) Thermal pollution a) Equal totheheat absorbed by the working c) Chemical pollution substance horn theregenerator d) Dissolved solids b) Not equal to the heat absorbed by the working substance from theregenerator 221.In the critical thickness of insulator concept c) Dependent on the value of temperature in fora cylinder, what does the Biot number the heat addition process indicate ifits value is less than 1? d) Measured during the constant temperature a) Condition foroptimum heat flow heat rejection process b) Addition of insulation will increase heat transfer rate 228.How do you calla device that converts c) Additional insulation will decrease theheat liquid refrigerant to vapor, with the held of transfer rate the surrounding heat? d)Heat transfer rate reachesa maximum a) Condenser b) Expansion valve 222.How do you call the ratio of the product of c) Compressor a connective heat transfer coefficient and d) Evaporator the critical radius of the insulator to that of the thermal conductivity of the insulator? 229.In gas compressor, when the volumetric a) Biot number efficiency increases, the piston b) Prandtl number displacement has: c)Nusselt number a) Not been changed d)Reynolds number b) Been decreased c) Been increased 223.This isa type of dryer that consists ofa d) Been insufficient data vertical shaft in which the wet feed is introduced at the top and falls downward 230.The ratio of its radiating power tothat ofa over baffles while coming in contact with black body at same temperature. the hot air that rises and exhaust at the top. a) Transmissivity b) Reflectivity ME d30 ME Practice with Gomprehensixe Examination Page i7 of3o