MDSP Elements No. 1 PDF

MDSP ELEMENTS NO. 1 1. In pure torsion, the maximum torsional occurs at the center B. 4 of the C. 3 A. Center D. 5 B. Long sides...

MDSP ELEMENTS NO. 1 1. In pure torsion, the maximum torsional occurs at the center B. 4 of the C. 3 A. Center D. 5 B. Long sides ANSWER: D C. Medium sides 11. Is the permissible variation of the size of a dimension D. Short sides A. tolerance ANSWER: B B. fits 2. The modulus of elasticity for ordinary steel usually falls C. limits between____ millions pounds per square inch. D. none of these A. 28 to 31 ANSWER: A B. 20 to 45 12. If there is no fit, a liberal tolerance of the order of ____in C. 26 to 28 the machining work could be permitted. D. 50 to 30 A. ±0.020 ANSWER: A B. ±0.010 3. The modulus of elasticity is a measure of C. ±0.09 A. accuracy D. ±0.05 B. quality ANSWER: B C. stiffness 13. A tolerance where the size of a part is permitted to be D. rigidity either larger or smaller than the given dimension ANSWER: C A. bilateral 4. The modulus of elasticity for most metals in compression is B. unilateral usually taken as that in C. lateral A. tension D. none of these B. bearing ANSWER: A C. torsion 14. A tolerance where the size of a part may be larger only, or D. yield smaller only, than the given dimension. ANSWER: A A. bilateral 5. The ratio of Moment and stress B. unilateral A. strain C. lateral B. contraction D. none of these C. proportional constant ANSWER: B D. section modulus 15. ____ are generally used on those dimensions involved in a ANSWER: D fit such as a pin in a hole. 6. For a symmetrical cross-section beam, the flexural stress is A. bilateral ____ when the vertical shear is maximum. B. unilateral A. infinity C. lateral B. maximum D. none of these C. zero ANSWER: B D. minimum 16. The ASA fits are based on the_____. ANSWER: C A. basic number system 7. When tested in compression, ductile materials usually B. basic hole system exhibit characteristics up to the yield strength as they when C. basic size system tested in tension. D. unit system A. the same ANSWER: B B. less than 17. When the hole is smaller than the shaft, it will take force or C. more than pressure to put the cold parts together. The allowance is D. approximately the same said to be negative and is termed as the ANSWER: D A. negative fits of metal 8. As one example, the ASME Code for riveted joints permits B. positive fits the design surface compressive stress to be about ____ C. intergeable higher than the design tensile stress. D. interference of metal A. 50% ANSWER: D B. 40% 18. Is the relatively finely spaced irregularities of the surface. C. 60% A. smoothness D. 70% B. lay ANSWER: C C. waviness 9. In a pressure vessel, the ratio of minimum strength of joint D. roughness to the strength of solid joint is known as ANSWER: D A. efficiency 19. Is the irregularities or departures from nominal surface of B. Performance factor grater spacing than roughness. C. joint efficiency A. smoothness D. relative strength B. lay ANSWER: D C. waviness 10. In pressure vessel, the usual factor of safety may be taken D. roughness as ANSWER: C A. 2  MDSP ELEMENTS NO. 1 20. Is the direction of the predominant surface pattern C. autofrettage A. smoothness D. countersinking B. lay ANSWER: C C. waviness 30. When two touching surfaces have a high contact pressure D. roughness and when these surfaces have minute relative motion, a ANSWER: B phenomenon called 21. The surface finish the micrometer anvils in rms A. prestressing A. 1 B. friction B. 3 C. carving C. 2 D. fretting D. 4 ANSWER: B ANSWER: A 31. Is the process that cold works a limited amount of material, 22. The surface of finish heavy cuts and coarse feed thus giving a higher strength, and it leaves a surface A. 200 rms compressive stress. B. 80 rms A. surface finishing C. 400 rms B. smoothing D. 500 or greater rms C. surfacing ANSWER: D D. surface rolling 23. It has been said that 80% of the failures of machine parts ANSWER: D have been 32. When a hot part is cooled suddenly by quenching, there is A. negligence momentarily a high temperature gradient that induces a B. compression stress gradient. Some metal parts under certain conditions C. torsion crack as a result; this phenomenon is called D. fatigue failures A. Thermal-shock failure ANSWER: D B. Thermal fatigue 24. For wrought steel in its commonly met commercial forms, C. Honing it is often assumed that the average endurance limit for an D. Quenching average Su(50% survival), the Brinell Hardness is limited to ANSWER: A ____. 33. Fatigue strength is increased by repeated loads just below A. 350 the normal fatigue limit, followed by a small step by step B. 450 increases of the loading, a process is called C. 400 A. mixing D. 500 B. coaxing ANSWER: C C. axing 25. Cazaud quotes values for steel showing Sn/ Su ratios, often D. relieving called endurance ratio, ____. ANSWER: B A. 0.23 to 0.65 34. Is the diameter of the imaginary cylinder that bounds the B. 0.63 to 0.93 crest of an external thread and the roots of an internal C. 0.34 to 0.87 thread. D. 0.34 to 0.45 A. mean diameter ANSWER: A B. stress diameter 26. Is the discontinuity or change of section, such as scratches, C. minor diameter holes, bends, or grooves, is a D. major diameter A. stress relieving ANSWER: D B. stress functioning 35. Is the distance in inches a screw thread (a helix) advances C. Stress concentration axially in one turn. D. stress raiser A. lead ANSWER: D B. circular pitch 27. The degree of stress concentration is usually indicated by a C. pitch A. power factor D. mean pitch B. stress factor ANSWER: A C. service factor 36. Is recommended for general use. D. stress concentration factor A. UNC ANSWER: D B. UNEF 28. In a part at uniform temperature and not acted upon by an C. UNF external load, any internal stresses that exist are called D. NC A. residual stress ANSWER: A B. superposed stress 37. If frequently used in automotive and aircraft work C. form stress A. UNC D. control stress B. UNEF ANSWER: A C. UNF 29. Is a process of prestressing or over-stressing a hollow D. NC cylindrical member beyond the elastic range by hydraulic ANSWER: C pressure 38. Is particularly useful in aeronautical equipment. A. pressttage A. UNC B. stress relieving B. UNEF  MDSP ELEMENTS NO. 1 C. UNF A. stud bolt D. NC B. carriage bolt ANSWER: B C. stove bolt 39. Is used on bolts for high-pressure pipe flanges, cylinder D. mini bolt head studs etc. ANSWER: C A. UNC 49. A large wood screw, is used to fasten machinery and B. UNEF equipment to a wooden base. C. UNF A. lag screw D. 8 UN B. wood screw ANSWER: D C. log screw 40. Then stress or load induced by the tightening operation D. None of these initial stress ANSWER: A residual stress 50. The length of contact in a tapped hole should be a initial tension minimum of about ___ for cast iron. none of these A. D ANSWER: A B. 1.5D 41. For non-metallic gaskets, it has been found that they C. 1.2D should have a certain minimum amount of compression as D. 2D ____ for a certain cork gasket. ANSWER: B A. 62% 51. When the location of bolt is such that it would normally be B. 68% shear, it is better practice to use C. 86% A. dammy bolts D. 76% B. mid-pin ANSWER: A C. crank pin 42. Is a screw fastening with a nut on it D. dowel pins A. bolt ANSWER: D B. rivet 52. Is a locking device used to maintain pressure between the C. fastener threads of the bolt and nut. D. None of these A. lock nuts ANSWER: A B. gasket 43. Is one that has no nut and turns into a threaded hole. C. lock washers A. stud bolt D. lokut B. rivet ANSWER: C C. U-bolt 53. Provides excellent locking properties for light assemblies. D. screw A. speed nut ANSWER: D B. an-cor-lox-nut 44. An old name for an unfinished through bolt, comes with a C. lock nut square. D. Flexloc nut A. coupling bolt ANSWER: A B. machine bolt 54. Which of the following is not the use of spring? C. stud bolt A. absorbs energy D. automobile bolt B. measure weight ANSWER: B C. source of energy in locks 45. Is a type of bolt finished all over, usually having coarse D. measure the thickness threads. ANSWER: D A. coupling bolt 55. It is the ratio of mean diameter of coil over the coil B. machine bolt diameter. C. stud bolt A. Waahl factor D. automobile bolt B. diameter ratio ANSWER: A C. spring index 46. Is a type of bolt distinguished by a short portion of the D. lead angle shank underneath the head being square or finned or ANSWER: C ribbed. 56. Is the overall length of the spring when it is compressed A. coupling bolt until all adjacent coils touched B. machine bolt A. compressed length C. stud bolt B. none of these D. carriage bolt C. free length ANSWER: D D. solid height 47. Is a type of bolt threaded on both ends and can be used ANSWER: D where a through bolt is impossible. 57. Is the length of coil spring under no load. A. coupling bolt A. compressed length B. machine bolt B. none of these C. stud bolt C. free length D. carriage bolt D. solid height ANSWER: C ANSWER: C 48. Is a cheap variety of bolt made in small sizes.  MDSP ELEMENTS NO. 1 58. In general, steel springs are made of relatively high-carbon C. constant ratio steel usually D. slenderness ratio A. more than 0.5% ANSWER: D B. 5% 68. Formula that applies to a very slender column. C. less than 0.5% A. Column formula D. 10% B. moment formula ANSWER: A C. slender formula 59. When heat-treated wire is coiled cold, it should be stress D. Eueler’s formula relieved for bending stresses after cooling by being heated ANSWER: D at some ____. 69. If two principal stress is zero, the sate of stress is A. 400% A. biaxial B. 700% B. uniaxial C. 600% C. mono-axial D. 500% D. triaxial ANSWER: D ANSWER: B 60. Is a low cost spring material, suitable where service is not 70. If one principal stress is zero, the state of stress is severe and dimensional precision is not needed. A. biaxial hard drawn wire spring B. uniaxial helical spring wire C. mono-axial stainless steel D. triaxial helical tension spring wire ANSWER: A ANSWER: A 71. If all the principal stresses have finite values, the system is 61. Is a hard drawn also (80%reduction), but it is made of high A. biaxial grade steel. B. uniaxial A. music wire C. mono-axial B. oil tempered wire D. triaxial C. song wire ANSWER: D D. chromium-silicon wire 72. Under theories of failure, for static loading of ductile ANSWER: A material, the design stress is 62. Is a spring wire with good quality for impact loads and A. Yield stress/factor of safety moderately high temperatures. B. Ultimate stress/factor of safety A. hard drawn wire spring C. Factor of safety/yield stress B. helical spring wire D. Endurance strength/factor of safety C. chromium-silicon ANSWER: A D. helical tension spring wire 73. Under theories of failure, the value of shear stress is ____ ANSWER: C that of tensile stress. 63. Is a type of coil where the helical coil is wrapped into a circle A. equal forming an annual ring B. double A. volute spring C. half B. motor spring D. 3 times C. hair spring ANSWER: C D. garter spring 74. The theory of mechanics of materials shows that the results ANSWER: D from the octahedral shear stress theory and those from the 64. A type of spring where thin flat strip wound up on itself a maximum distortion-energy theory are plane spiral, usually anchored at the inside end. A. relevant A. volute spring B. less than B. motor spring C. the same C. hair spring D. more than D. garter spring ANSWER: C ANSWER: B 75. Is the distance measured axially, from a point on one 65. A type of spring made in then form of a dished washer. thread to the corresponding point in an adjacent thread. A. volute spring A. axial pitch B. motor spring B. lead C. hair spring C. z-pitch D. belleville spring D. lead angle ANSWER: D ANSWER: A 66. A type of failure due to unstability. 76. Is the angle between a tangent to the pitch helix and a A. slenderness ratio plane normal to the axis of the screw. B. buching hum A. helix angle C. buckling B. tangent angle D. stability C. lead angle ANSWER: C D. vertical angle 67. Is the ratio of the length of the column and the radius of ANSWER: C gyration of the cross-sectional area about a centroidal axis. 77. For ACME thread the pressure angle normal to the thread A. power factor is B. contact ratio A. 12.5°  MDSP ELEMENTS NO. 1 B. 14.5° 87. Criteria for the limiting torsional deflection vary from 0.08° C. 13.5° per foot of length for machinery shafts _____ per foot. D. 34° A. 1 degree ANSWER: B B. 3 degrees 78. If the thread surfaces are smooth and well lubricated, the C. 2 degrees coefficient of friction may be as low as D. 4 degrees A. 0.12 ANSWER: A B. 0.16 88. For transmission shafts the allowable deflection is 1 degree C. 0.14 in a length of ___ diameters. D. 0.10 A. 10 ANSWER: D B. 20 79. For doughtful workmanship, the recommended coefficient C. 15 of friction of thread is D. 25 A. 0.120 ANSWER: B B. 0.102 89. An old rule of thumb for transmission shafting is that the C. 0.125 deflection should not exceed ____ of length between D. 0.234 supports. ANSWER: C A. 0.01 in per foot 80. A screw that requires a positive torque to lower the load, B. 0.03 in per foot or to loosen the screw if it has been turned tight against a C. 0.02 in per foot resistance. D. 0.04 in per foot A. power screw ANSWER: A B. self screw 90. In general, for machinery shafts, the permissible deflection C. lock screw may be closer to D. self locking screw A. 0.02 in/ft ANSWER: D B. 0.01 in/ft 81. Is a rotating member transmitting power C. 0.002 in/ft A. axle D. 0.03 in/ft B. line shaft ANSWER: C C. shaft 91. Gleason states that at bevel gears, sizes 5 in to 15 in, the D. countershaft gears should not be lift or depress more than ANSWER: C A. 0.01 in 82. Is a stationary member carrying rotating member B. 0.004 in transmitting power. C. 0.002 in A. axle D. 0.003 in B. line shaft ANSWER: D C. shaft 92. The speed at which the center of mass will be equal the D. countershaft deflecting forces on the shaft; the shaft with its attached ANSWER: A bodies will then vibrate violently, since the centrifugal force 83. A line shaft is also changes its direction as the shaft turns is A. countershaft A. mean speed B. line shaft B. critical speed C. main shaft C. geometric speed D. head shaft D. unit speed ANSWER: C ANSWER: B 84. Is the shaft intermediate between a line shaft and a driven 93. For shaft, the minimum value of numerical combined shock shaft and fatigue factor to be applied in every case to the A. countershafts computed bending moment is B. jackshafts A. 1.0 C. headshafts B. 1.5 D. all of these C. 1.3 ANSWER: D D. 1.8 85. Short shafts on machines are often called ANSWER: B A. medium shafts 94. Most keys are B. core shafts A. flat keys C. spindles B. square keys D. head shafts C. saddle keys ANSWER: C D. A & B 86. For shafts, the shear due to bending is maximum at the ANSWER: D neutral plane where the normal stress is 95. It is suggested that the design factor on yield strength be A. maximum about 1.5 for the smooth load, about 2 to 2.5 for minor B. zero shock loading, and up to ___ severe shock loads, especially C. minimum when the loading reverses during operation. D. constant A. 3.0 ANSWER: B B. 4.0 C. 3.5  MDSP ELEMENTS NO. 1 D. 4.5 106. Gears used to transmit power between shafts axis of which ANSWER: D intersect: 96. Typical hub lengths fall between ____ A. spur gear A. 1.25D to 2.4D B. bevel gear B. 1.25D to 5D C. helical gear C. 1.3D to 3.4D D. straight bevel gear D. D to 7D ANSWER: B ANSWER: A 107. An iron has physical closely resembling 97. A key that is square or flat and tapered with head. A. malleable cast iron A. pin key B. malleable iron B. saddle keys C. white iron C. gib-head keys D. gray iron D. none of these ANSWER: A ANSWER: C 108. The space between the adjacent teeth: 98. A key may either straight or tapered. It is usually a drive fit. A. tooth A. pin key B. backlash B. saddle keys C. flank C. gib-head keys D. width D. none of these ANSWER: D ANSWER: A 109. An iron in which most of the carbon is chemically combined 99. A key with one several patented methods of keying, is with the iron: driven or pressed into a hole that is small enough to close A. cast iron the slit, assembled in radial direction. B. gray iron A. fit key C. white iron B. saddle key D. malleable iron C. rollpin ANSWER: C D. pin key 110. A machine used in testing steel generally strike the ANSWER: C specimen with an energy from 220 to 265 ft-lb 100. Kennedy keys is also known as A. Izod test A. tangential keys B. Charpy test B. normal keys C. Rockwell test C. saddle keys D. Test blocks D. rollpin ANSWER: B ANSWER: A 111. The area in the machine shop whose metal is being melted 101. The size of an equal-leg length fillet weld shall be based on to form a new shape is the: the length of the largest: A. foundry area A. isosceles right triangle B. tool and die B. square C. welding area C. right triangle D. mass production area D. rectangle ANSWER: A ANSWER: A 112. Which of the following is not the work of the machinist: 102. Milling machine accessories are used to hold milling cutter A. re-boring in the milling machine: B. overhauling A. spindle-nose tooling C. grinding B. milling machine vise D. boring C. vertical milling attachment ANSWER: B D. milling machine arbors 113. The machine which can flatten surface on a horizontal, ANSWER: D vertical or angular plane is: 103. The cheapest and the most abundant engineering material: A. drilling machine A. steel B. shaper machine B. aluminum C. power saw C. cast iron D. lathe machine D. babbit ANSWER: B ANSWER: C 114. Which of the following is not part of a lathe machine: 104. They are usually the steel or steel casting: A. fan A. mild steel B. carriage B. carbon steel C. headstock C. firebox steel D. tailstock D. drop-forge-dies ANSWER: A ANSWER: B 115. One important skill that operators of machine tools must 105. An important accessory of milling machines: have an understanding of measurement which demands: A. milling machine vise A. speed B. cutters B. neatness C. ram C. precision D. vertical milling attachment D. sociability ANSWER: B ANSWER: C  MDSP ELEMENTS NO. 1 116. Which of the following metals is non-magnetic? A. manganese steel B. cast steel C. alloy steel D. cast iron ANSWER: A 117. Which tool does not belong to the group? A. vise grip B. feeler gage C. torque wrench D. adjustable wrench ANSWER: B 118. What process does not belong to the group? A. brazing B. soldering C. hardening D. resistance welding ANSWER: C 119. A machinery operation whereby the tool rotates while the feed is stationary: A. shaping B. milling C. turning D. reaming ANSWER: B 120. Which of the following is not a kind of cast iron? A. gray iron B. white iron C. malleable iron D. lead iron ANSWER: D 121. Which of the following is not used to temper steel? A. oil bath B. brine/salt bath C. steam bath D. water bath ANSWER: C 122. Which of the following is not a part of a headstock? A. anvil B. spindle C. motor D. back gear ANSWER: A 123. The ability of material or metal to resist being crushed is: A. fatigue strength B. bending strength C. torsional strength D. compressive strength ANSWER: D 124. Which of the following metal is easy to chisel? A. alloy steel B. manganese steel C. stainless steel D. cast iron ANSWER: D 125. Ferrous metal contain a relatively large amount of: A. manganese B. carbon C. sulfur D. phosphorous ANSWER: B  MDSP ELEMENTS NO. 2 1. A key that allows the hub to move along the shaft but A. even clearance prevents the rotation of the shaft. B. clearance ratio A. Woodruff key C. fit clearance B. feather key D. radial clearance C. gibs key ANSWER: D D. square key 11. Is one in which the radii of the journal and the bearing are ANSWER: B the same. 2. For involute spline, the type of fits used A. fitted bearing A. close fit B. partial bearing B. press fit C. full bearing C. sliding fit D. clearance bearing D. all of these ANSWER: A ANSWER: D 12. The line that passes through the centers of the bearing and 3. Used for permanent fits, are similar to involute splines the journal is called the except that the pressure angle is 14.5°. A. line of action A. separation load B. line of centers B. stub serrations C. undercut C. spline shaft D. line of tangent D. involute serrations ANSWER: B ANSWER: D 13. For hydrocarbon oils, the specific gravity will be closed to 4. Are used as couplings, or in addition to another couplings A. 0.34 where, in case of overload, there is danger of danger of B. 0.93 injury to machine or to material in process. C. 0.74 A. involute serations D. 0.83 B. shear pin ANSWER: D C. flange coupling 14. ____ length-diameter ratio was a good compromise for the D. king pin general case of hydrodynamics bearings is approximately ANSWER: B A. 1 5. A coupling that transmits power via the frictional forces B. 3 induced by pulling the flanges toward each other over C. 2 slotted tapered sleeves. D. 4 A. flange coupling ANSWER: A B. ribbed compression coupling 15. Operating temperature of oil film ranges ___, or less. C. rigid coupling A. 140° to 150° D. flanged compression coupling B. 130° to 160° ANSWER: D C. 120° to 190° 6. A coupling used for absorbing some shock and vibration D. 140° to 160° that may appear on one shaft and of preventing the ANSWER: D occurrence of reversed stresses caused by the shaft 16. At higher temperatures, the oil oxidizes, more rapidly deflecting at the coupling. above A. rigid coupling A. 120°F B. flexible coupling B. 140°F C. flange coupling C. 160°F D. none of these D. 200°F ANSWER: B ANSWER: D 7. For a single Hooke’s coupling, the shaft angle should not be 17. A conclusion repeatedly verified by experiment is that the greater than about ____. smoother the surface A. 10° A. the greater the load capacity of the breathing B. 15° B. the lesser the capacity of the bearing C. 12° C. constant D. 30° D. none of these ANSWER: B ANSWER: A 8. Journal bearing composed of two principal parts, 18. The following are considered advantageous for bearing A. bearing and journal materials include B. clearance and fitted A. conformability C. shaft and babbit B. embeddability D. shaft and cylinder C. compatibility ANSWER: A D. all of these 9. When the line of action of the load, bisects the arc of partial ANSWER: D bearing, the bearing is said to be 19. For thrust bearing, the speed at moderate operating A. eccentrically loaded conditions is B. fit loaded A. 50 < vm > 200 fpm C. centrally loaded B. 50 < vm > 220 fpm D. surface loaded C. 50 < vm > 250 fpm ANSWER: C D. 50 < vm > 290 fpm 10. Is the difference in the radii of the bearing and the journal ANSWER: A  MDSP ELEMENTS NO. 2 20. The 200 series bearing is called 30. Experience suggests that the most economical designs are A. heavy obtained for a belt speed of B. medium A. 4000 to 4500 fpm C. light B. 2000 to 3000 fpm D. none of these C. 3000 to 4000 fpm ANSWER: C D. 4000 to 5000 fpm 21. The 300 series bearing is called: ANSWER: A A. heavy 31. For leather belts, recommended speed is: B. medium A. 6000 to 7500 fpm C. light B. 2000 to 3000 fpm D. all of these C. 7000 to 8000 fpm ANSWER: B D. 4000 to 5000 fpm 22. A type of roller bearing in which the balls are assembled by ANSWER: C the eccentric displacement of the inner ring. 32. For fabric belts, recommended speed is: A. shallow-groove ball bearing A. 4000 to 4500 fpm B. self-aligning ball bearing B. 2000 to 3000 fpm C. filling-slot ball bearing C. 3000 to 4000 fpm D. deep-groove ball bearing D. 2000 and more fpm ANSWER: D ANSWER: D 23. Which of the following is not a type of ball bearing 33. On high speed centrifugal blowers, it has been observed A. shallow-groove ball bearing that the arc of contact reduced from 180° at rest to ____ in B. self-aligning ball bearing motion. C. filling-slot ball bearing A. 100° D. deep-groove ball bearing B. 95° ANSWER: A C. 90° 24. Are toothed wheels whose tooth elements are straight and D. 110° parallel to the shaft axis or used to transmit motion and ANSWER: D power between parallel shafts. 34. The recommended initial tension of belt is ___. A. helical gear A. 75 lb/in of width B. worm gear B. 71 lb/in of width C. bevel gear C. 73 lb/in of width D. spur gear D. 80 lb/in of width ANSWER: D ANSWER: B 25. The density of a leather belt is 35. The recommended net belt pull for rubber belt is A. 0.035 lb/in3 A. 11.34 lb/ply per inch of width B. 0.253 lb/in3 B. 13.75 lb/ply per inch of width C. 0.046 lb/in3 C. 16.35 lb/ply per inch of width D. 0.074 lb/in3 D. 20.34 lb/ply per inch of width ANSWER: A ANSWER: B 26. The density of flat rubber belt material is 36. If two intersecting shafts are to be belt connected, ____ A. 0.055 lb/in3 guide pulleys are to be used. B. 0.045 lb/in3 A. 1 C. 0.0725 lb/in3 B. 3 D. 0.0726 lb/in3 C. 2 ANSWER: B D. 4 27. The breaking strength of oak-tanned belting varies from 3 ANSWER: C to more than 37. Two shafts at right angles to each other may be connected A. 5 ksi by the ___ arrangement. B. 7 ksi A. half turn C. 6 ksi B. ¾ turn D. 8 ksi C. one turn ANSWER: C D. quarter turn 28. If the ends are joined by wire lacing with machine, the usual ANSWER: D efficiency of joint is 38. The minimum number of teeth on the smaller sprocket for A. 100% low speeds is B. 85% A. 12 C. 75% B. 16 D. 88% C. 14 ANSWER: D D. 18 29. The tension in the belt due to centrifugal force increases ANSWER: A rapidly above about ____. 39. The minimum number of teeth on the smaller sprocket for A. 2500 fpm moderate speeds is B. 3500 fpm A. 15 C. 3000 fpm B. 19 D. 4000 fpm C. 17 ANSWER: A D. 21  MDSP ELEMENTS NO. 2 ANSWER: C ANSWER: A 40. The minimum number of teeth on the smaller sprocket for 50. The minimum suggested design factors of wire ropes for high speeds is miscellaneous hoisting equipment is A. 19 A. 2 B. 21 B. 5 C. 23 C. 3 D. 25 D. 4 ANSWER: B ANSWER: B 41. Wire ropes are made from cold-drawn wires that are first 51. To avoid excessive wear rate the recommended limiting wrapped into ____. pressure for 6 x 19 rope is ____ for cast iron A. layer A. 200 psi B. segment B. 400 psi C. strands C. 300 psi D. none of these D. 500 psi ANSWER: C ANSWER: D 42. For maximum quietness, use sprockets with ____ or more 52. To avoid excessive wear rate the recommended limiting teeth. pressure for 6 x 19 rope is ____ for cast steel A. 21 A. 700 psi B. 25 B. 1000 psi C. 23 C. 900 psi D. 27 D. 1200 psi ANSWER: D ANSWER: C 43. A wire rope that wires and strands are twisted in opposite 53. To avoid excessive wear rate the recommended limiting direction pressure for 6 x 19 rope is ____ for manganese steel A. long lay A. 2500 psi B. lang lay B. 3000 psi C. regular lay C. 2000 psi D. performed D. 2300 psi ANSWER: C ANSWER: A 44. A wire rope that the wires and strands are twisted in the 54. Friction devices used to regulate the motion of bodies and same direction with clutches. A. long lay A. roller B. lang lay B. brakes C. performed C. babbit D. non-performed D. holders ANSWER: B ANSWER: B 45. Ropes used for haulages, rigging, guard rails 55. Are friction devices used to connect shafts A. 6 x 35 IWRC A. brakes B. 6 x 25 IWRC B. clutches C. 7x8 IWRC C. spring D. 7x7 IWRC D. holders ANSWER: D ANSWER: B 46. Used for general purpose rope 56. That part of the total frictional energy that is stored in the A. 6x 19 IWRC brake parts, principally in the drum or disk, has been B. 6 x 21 IWRC variously estimated at _____. C. 6x19 IWRC A. 56% up D. 7 x 26 IWRC B. 86% up ANSWER: C C. 90% up 47. Rope used in lines, hawsers, overhead cranes, and hoists. D. 75% up A. 6 x 34 IWRC ANSWER: D B. 6 x 35 IWRC 57. The effectiveness of the brake may greatly decrease shortly C. 6 x 45 IWRC after it begins to act continuously. D. 6 x 37 IWRC A. vade ANSWER: D B. acted 48. The regular materials for wire rope are made of C. fade A. chromium D. cade B. cast steel ANSWER: C C. wrought iron 58. The brake capacity to absorbs energy is known as: D. high-carbon steel A. energy ANSWER: D B. resistance brake 49. The ultimate strength of improved flow steel (IPS) is C. power between D. braking torque A. 240 and 280 ksi ANSWER: D B. 200 and 400 ksi 59. If the band wraps partly around the brake wheel or drum, C. 230 and 230 ksi and braking action is obtained by pulling the band tight D. 400 and 500 ksi onto the wheel.  MDSP ELEMENTS NO. 2 A. block brake 69. The ___ full depth teeth have the advantages of greater B. band brake capacity and less interference trouble. C. clutch A. 14.5° D. centrifugal brake B. 24° ANSWER: B C. 20° 60. A clutch that has a disadvantage of heavier rotating masses. D. 30° A. Multiple disc clutch ANSWER: C B. disc clutch 70. Is the average tangential force on the teeth, is then C. cone clutch obtained from the horse power. D. none of these A. total load ANSWER: A B. separation load 61. The brake lining operating at temperature ____, sintered C. pressure load mixtures containing ceramics are used. D. tangential load A. 750° to 1000°F ANSWER: D B. 560° to 900°F 71. The service factor of a gear may be taken as ____ if an C. 800° to 1200°F electric motor drives a centrifugal blower. D. 400° to 789°F A. 1 ANSWER: A B. 3 62. Are resistance welds, usually round, in the same form as C. 2 the electrodes that press the sheets together. D. 4 A. edge joint ANSWER: A B. MIG welds 72. The kind of wear occurs because of a fatigue of the surface C. spot welds material as a result of high contact stresses. D. TIG welds A. slotting ANSWER: C B. pitting 63. Consists of short lengths (2-3 in long) of welds with space C. involuting between, as 6 in on centers. D. curving A. intermittent weld ANSWER: B B. MIG welds 73. Is caused by foreign matter, such as grit or metal particles, C. spot welds or by a failure of the oil film at low speed. D. TIG welds A. auction ANSWER: A B. scoring 64. Is an intermittent weld, lightly done to hold the members C. abrasion in position for assembly purposes or for principal welding D. corrosion A. edge welds ANSWER: C B. tack welds 74. Occurs when the oil film fails, but in this case, the load and C. back welds speed are so high that the surface metal is melted and the D. half welds metal is smeared down the profile. ANSWER: B A. abrasion 65. A welding operation that use hot flame and metal rod. B. corrosion A. gas welding C. spalling B. arc welding D. scoring C. resistance welding ANSWER: D D. automatic welding 75. Is a surface fatigue of greater extent than pitting; that is the ANSWER: A flakes are much larger. This type of failure occurs in surface- 66. The arc is covered with a welding composition, and bare hardened teeth. electrode wire is fed automatically. A. abrasion A. resistance welding B. corrosion B. submerged arc welding C. spalling C. induction welding D. scoring D. spot welding ANSWER: C ANSWER: B 76. Buckingham says that mating phenolic gears with steel of 67. The recommended coefficient of fluctuation of flywheels BHN less than ____ leads to excessive abrasive wear. for punching, shearing, pressing machines is A. 200 A. 0.05-0.1 B. 400 B. 0.03-0.05 C. 300 C. 0.002 D. 500 D. 0.01-0.02 ANSWER: B ANSWER: A 77. The extra tooth in gear which is use to distributes the wear 68. For best running conditions of gear, the contact ratio more evenly. should be about A. hunting tooth A. 1.25 to 1.4 B. tooth profile B. 1.20 to 1.45 C. dammy tooth C. 1.34 to 1.56 D. add tooth D. 1.62 to 1.45 ANSWER: A ANSWER: A  MDSP ELEMENTS NO. 2 78. The length of the hub should not be made ____ the face C. worm gear width of the gear. D. bevel gear A. less than ANSWER: D B. equal 88. Bevel gear teeth are built with respect to a ____, rather C. greater than to a pitch cylinder as in spur gears. D. none of these A. pitch pedal ANSWER: A B. pitch profile 79. ____ is a gear that has teeth cut on the inside of the rim C. pitch cone instead of on the outside. D. cylinder A. external gear ANSWER: C B. involute gear 89. The length of pitch cone in a bevel gear. C. stub gear A. cone center D. annular gear B. lead ANSWER: D C. center distance 80. To eliminate fouling, let the minimum differences in tooth D. pitch numbers between the internal gear an pinion, be ____ ANSWER: A 14.4° involute full-depth. 90. The cone formed by the elements of the top lands A. 10 teeth A. face cones B. 14 teeth B. tooth face C. 12 teeth C. dial face D. 16 teeth D. pitch face ANSWER: C ANSWER: A 81. The loss per pair of spur, helical, or bevel gears in an 91. The cone formed by the elements of bottom lands ordinary train should not exceed ____. A. face cone A. 4% B. root cone B. 2% C. back cone C. 6% D. rake cone D. 3% ANSWER: B ANSWER: B 92. Is an imaginary cone whose elements are perpendicular to 82. The typical helix angle ranges from ____ to ____. the pitch cone elements at the large end of the tooth. A. 12° to 15° A. front cone B. 10° to 12° B. side rake C. 14° to 20° C. back cone D. 15° to 25° D. rear cone ANSWER: D ANSWER: C 83. Is the advance of the tooth in the face with divided by 93. Is one whose tooth profiles consist of straight elements circular pitch. that converge to a point at the cone center. A. face contact ratio A. circular bevel gear B. speed ratio B. straight bevel gear C. profile ratio C. path bevel gear D. advance ratio D. herringbone gear ANSWER: A ANSWER: B 84. Is the distance between the teeth measured on the pitch 94. The desired qualities in gears is surface along a normal to the helix. A. quietness A. lead B. durability B. lead angle C. strength C. pitch D. all of these D. normal circular pitch ANSWER: D ANSWER: D 95. Straight and Zerol bevel gears should not be used when the 85. The hardness of helical and herring bone teeth cut after pitch line velocity is greater than about ___. heat treatment will generally fall between the limits of A. 800 rpm A. 210 and 300 Brinell B. 875 rpm B. 147 and 300 Brinell C. 850 rpm C. 230 and 320 Brinell D. 900 rpm D. 220 and 320 Brinell ANSWER: D ANSWER: A 96. The spiral bevel gear and hypnoid bevel gears are 86. Helical gears mounted on non-parallel shafts are called recommended when the pitch line speed exceeds ___. A. open gear A. 1100 fpm B. crossed helical gear B. 1500 fpm C. closed helical gear C. 2000 fpm D. herringbone gear D. 1000 fpm ANSWER: B ANSWER: D 87. Are used to connect intersecting shafts, usually but not 97. When the pitch line speed is above 8000 fpm, the teeth necessarily at 90°. should be ____. A. spur gear A. ground after hardening B. helical gear B. should be cooled in air  MDSP ELEMENTS NO. 2 C. should be quenched after hardening C. medium force fit D. none of these D. bound ANSWER: A ANSWER: D 98. ____ have curved teeth, as in spiral bevels, but with zero 108. The use of mixtures (hydrated lime, fly ash, etc.) with spiral angle. concrete is to _____. A. spiral gear A. reduce weight B. zerol bevel gear B. increase durability C. zero bevel gear C. improve workability, hardening, or strength D. straight bevel gear characteristics ANSWER: B D. accelerate curing 99. A gear that has an advantage of smoother tooth ANSWER: C engagement, quietness of operation, greater strength, and 109. Stainless steel is obtained principally be the used of which higher permissible speeds. alloying elements: A. zerol bevel gear A chromium B. straight bevel gear B. nickel C. hypoid bevel gear C. carbon D. spiral bevel gears D. tungsten ANSWER: D ANSWER: A 100. Certificate of registration for the practice of mechanical 110. It is generally recommended and normal for a designer to engineering shall be of ____ categories. add a hunting tooth to evenly distribute the wear on A. 1 meshing teeth like a 53 teeth gears mesh with 30 teeth B. 2 Pinion. Find the rotation of pinion to mesh with same pair C. 3 of teeth again. D. 4 A. 120 ANSWER: C B. 81 101. Which of the following is not a classification of iron ore: c. 61 A. siderite D. 53 B. hematite ANSWER: D C. sulfurite 111. A machining operation whereby the tool reciprocates and D. magnetite the feed is Stationary, is called: ANSWER: C A. Planing 102. All of the following materials are used in the quenching B. Shaping process for steel manufacturing except C. Turning A. air D. Reaming B. brine ANSWER: B C. hydrogen 112. One of the following metals which respond to heat D. water treatment: ANSWER: C A. cast iron 103. Hearingbone gears are gears which: B. wrought iron A. do not operate on parallel shafts C. medium carbon steel B. have a line of contact between the teeth D. low carbon steel C. tend to produce and trust on the shafts ANSWER: C D. consist of two left handed helical gears 113. Schedule 40 pipe refers to ANSWER: B A. stress 104. Steel used as a wire in concrete is for B. low quality A. increased material density C. standard wall pipe B. increased yield strength D. standard diameter C. shrinkage and expansion control ANSWER: C D. increased abrasion resistance 114. Which of the following is not a strength property of metals? ANSWER: C A. tensile strength 105. The internal stresses existing in a welded connection are B. rocking strength A. relieved by x-ray analysis C. fatigue strength B. may be relieved when the weld is peened D. torsional strength C. not relieved when the weld is peened ANSWER: B D. not relieved by heat treatment 115. A machine used in shaping metal by means of abrasive ANSWER: C wheel or the removal of metals with an abrasive is called: 106. In the usual spur gearing, the: A. planer machine A. pitch circle and base circle are the same B. power B. working depth includes the clearance C. shaper machine C. tooth outline are always cycloidal curves D. grinding machine D. tooth outline are usually involute curves ANSWER: D ANSWER: D 116. Which of the following is not a kind of mandrel? 107. One of the following is not common terms relating to the A. expansion mandrel classification of fits: B. taper mandrel A. tunking C. contraction mandrel B. snug D. gang mandrel  MDSP ELEMENTS NO. 2 ANSWER: C 117. The kind of center which is being attached and meshed to the tailstock spindle which is also static while the work is rotating is: A. dead center B. live center C. focal center D. work center ANSWER: A 118. Which of the following is the only allotropic alloy of steel? A. aluminum alloys B. copper alloys C. magnesium D. iron-carbon alloys ANSWER: D 119. During the quenching process in heat treating steel, agitation of the fluids used in the quenching has what effect on the severity of the quenching? A. increases quenching severity. B. decreases quenching severity, C. has no effect on quenching severity. D. reverses quenching severity ANSWER: A 120. The ratio of average shear stress to maximum shear stress for a circular section equal to: A. 2 B. 2/3 C. 3/2 D. 3/4 ANSWER: D 121. When a solid cube is subjected to equal normal forces of the same type on all its faces. The ratio of volumetric strain/linear strain along any of the three axes will be equal to: A. 1 B. 2 C. √3 D. 3 ANSWER: D 122. The ratio of bulk modulus to shear modulus for Poisson's ratio of 0.25 will be equal to: A. 3/2 B. 5/6 C. 1 D. 6/3 ANSWER: C 123. The stress strain curve for a glass rod during tensile test is: A. A straight line B. A parabola C. A sudden break D. An irregular curve ANSWER: D 124. When shear force is zero along a section, the bending moment at that section will be: A. Zero B. Minimum C. Maximum D. Minimum or maximum ANSWER: B 125. The ultimate tensile stress of mild steel as compared to its ultimate compressive stress will be: A. Same B. More C. Less D. More or less depending on other factors ANSWER: C  MDSP ELEMENTS NO. 3 1. Are bevel gears mounted on intersecting shafts at angle of B. Athletic Gear Main Association other than 90ᵒ. C. American Gear Metal Association A. right angle gears D. American Gear Manufacturers Association B. half gears ANSWER: D C. inclined gears 11. Which of the following does not belong to the group? D. angular gears A. Tooth scoring ANSWER: D B. Tooth breakage 2. Is one in which the pitch angle is 90ᵒ that is, the pitch cone C. Pitting has become a plane. D. toughing A. spur gear ANSWER: D B. crown gear 12. Well proportioned commercial gears with a pitch line C. worm gear velocity of less than_____ will normally not score if they D. worm wheel have a reasonably good surface finish and are properly ANSWER: B lubricated. 3. Is used to transmit power between nonintersecting shafts , A. 6000 fpm nearly always at right angle to each other. B. 7000 fpm A. Spur gear C. 6500 fpm B. Ordinary gear D. 8000 fpm C. Bevel gear ANSWER: B D. Worm gear 13. Experimental data from actual gear unit measurements are ANSWER: D seldom repeatable within a plus or minus____ band 4. The two types of construction for the worm are: A. 5% A. Shell and cylindrical B. 15% B. Shell and zigzag C. 10% C. Shell and integral D. 20% D. Tube and integral ANSWER: C ANSWER: C 14. Pitting is a function of the Hertzian contract stresses 5. The standard pressure angle for fine pitch gears is ____ between two cylinders and is proportional to the square degrees and is recommended for most applications. root of the ______. A. 14. 5ᵒ A. applied load B. 21ᵒ B. the contact stress C. 20ᵒ C. the stress D. 16ᵒ D. impact ANSWER: C ANSWER: A 6. The contact ratio of pair of mating spur gears must be well 15. When an excitation frequency coincides with a natural over____ to insure a smooth transfer of load from one pair frequency. of teeth to the next pair. A. unity A. 1.0 B. resonance B. 3.0 C. obliquity C. 2.0 D. sinusoidal D. 4.0 ANSWER: B ANSWER: A 16. The average tooth stiffness constant of face is usually 7. As general rule contact ratio should not be less than A. 1.5 to 2 psi about______. B. 5 to 6 psi A. 1.1 C. 3 to 4 psi B. 1.3 D. 7.5 to 10 psi C. 1.2 ANSWER: A D. 1.4 17. Cast iron shall not be used over ANSWER: D A. 420ᵒF 8. Surface roughness on active profile surface on gear is about B. 430ᵒF ____ pitch. C. 440ᵒF A. 30 B. 34 D. 450ᵒF C. 32 ANSWER: D 18. When the number of teeth in a pair of meshing gears are D. 36 such that they do not have a common divisor. ANSWER: C A. dummy 9. Tooth breakage on gear is usually a____, B. LCD A. A tensile fatigue C. addit B. Contact stress D. hunting C. A crack ANSWER: D D. None of these 19. For internal gears having a 20ᵒ pressure angle and full ANSWER: A depth teeth, the difference between the number of teeth 10. GMA means in a gear and pinion should not less than ____. A. American German Manufacturers Association A. 10  MDSP ELEMENTS NO. 3 B. 14 28. Arc of the circle through which a tooth travels from the C. 12 point of contact with the mating tooth to the pitch point D. 16 A. angle of arc ANSWER: C B. arch of contract 20. Zero bevel gears of 20 degrees angle should have a pinion C. arc of approach either no less than____. D. none of the above A. 15 teeth ANSWER: C B. 17 teeth 29. The ratio of the arc of approach to the arc of action. C. 16 teeth A. Ratio and proportion D. 18 teeth B. contract ratio ANSWER: B C. approach ratio 21. _____ are machine elements thar transmit motion by D. arc ratio means of successively engaging teeth. ANSWER: C A. shaft 30. In a pair of gears it is the plane that contains the two axes, B. sprocket in single gear, it may be any plane containing the axis and C. spline the given point. D. gear A. axial plane ANSWER: D B. pitch plane 22. Height of tooth above pitch circle or the distance between C. surface plane the pitch circle and the top of the tooth. D. bottom land A. addendum ANSWER: A B. dedendum 31. Arc of the pitch circle through which a tooth travels from C. total depth its contact with the mating tooth at the pitch point to the D. tooth depth point where the contact ceases. ANSWER: A A. arc of recess 23. The circle that bounds the outer ends of the teeth. B. arc of approach A. root circle C. arc of contact B. pitch circle D. arc of intersection C. addendum circle ANSWER: A D. dedendum circle 32. The amount by which the width of the tooth space exceeds ANSWER: C the thickness of the engaging tooth on the pitch circles. 24. Arc of the pitch circle through which a tooth travels from A. clearance the first point of contact with the mating tooth to the pitch B. backlash point. C. difference A. line of action D. tooth difference B. arc of action ANSWER: B C. arc of action 33. The circle from which an involute tooth is generated or D. pitch arc developed. ANSWER: B A. Pitch circle 25. Is the angle through which the gear turns from the time a B. Contact circle given pair of teeth are in contact at the pitch point until C. addendum circle they pass out the mesh. D. base circle A. angle of contact ANSWER: D B. angle of approach 34. The angle, at the base cylinder if an involute gear that the C. position angle tooth makes with the gear axis. D. angle of recess A. pitch angle ANSWER: D B. approach angle 26. Is the angle through which the gear turns from the time a C. helix angle particular pair of teeth come into contact until they go out D. none of these the contact. ANSWER: C A. pitch angle 35. In an involute gear it is the pitch on the base circle or along B. angle of action the line of action. C. angle of approach A. critical pitch D. none of these B. helix pitch ANSWER: B C. diametral pitch 27. Is the angle through which the gear turns form the time a D. base pitch particular pair of teeth come into contact until they are in ANSWER: D contact at the pitch point. 36. Is the base pitch in the normal plane. A. angle approach A. normal base pitch B. angle of recess B. Tangential pitch C. angle of contact C. total pitch D. none of tangent D. intersecting pitch ANSWER: A ANSWER: A  MDSP ELEMENTS NO. 3 37. Is the base pitch in the axial plane. 46. Is the circular pitch in the normal plane. A. axial base pitch A. Circular pitch B. cone pitch B. diametral pitch C. radial pitch C. pitch circle D. linear pitch D. normal circular pitch ANSWER: A ANSWER: D 38. The distance between the parallel axes of sugar gears and 47. Also known as tooth thickness or the length of the arc parallel helical gears, or between the crossed axes of helical between the two sides of a gear tooth, on the pitch circles gears and worm gears. unless otherwise specified. A. vertical distance A. tooth thickness B. horizontal distance B. space thickness C. displacement C. circular thickness D. center distance D. clearance thickness ANSWER: D ANSWER: C 39. In a woman gear this is a plane perpendicular to the gear 48. The amount by which the dedendum exceeds the axis and contains the common perpendicular of the gear addendum of the mating tooth and the woman axis. A. difference A. inner plane B. clearance B. central plane C. backlash C. pitch plane D. none of these D. angular plane ANSWER: B ANSWER: B 49. The smallest diameter on gear tooth with which the mating 40. Length of the chord subtended by the circular thickness arc. gear makes. A. chordal thickness A. pitch diameter B. tooth thickness B. circular diameter C. space thickness C. tangential diameter D. flank thickness D. central diameter ANSWER: A ANSWER: D 41. The height from the top of the tooth to the chord 50. The ratio of the arc of action to the circular pitch. subtending the circular- thickness arc. A. approach ratio A. addendum height B. conjugate ratio B. tangential height C. approach ratio C. chordal addendum D. contact ratio D. addendum circle ANSWER: D ANSWER: C 51. Is the curve that satisfy the law of gearing. 42. Length of the arc of the pitch circle between the centers or A. involute curve other corresponding points of the adjacent teeth. B. conjugate curve A. pitch arc C. fillet curve B. circular pitch D. bottom land curve C. circular arc ANSWER: B D. contract arc 52. The curve formed by the path of a point on circle as it rolls ANSWER: B along a straight line. 43. The smallest diameter on gear tooth with the which the A. epicycloid mating gear makes contact. B. trochoid A. inside diameter C. hypocycloid B. outside diameter D. cycloid C. nominal diameter ANSWER: D D. contact diameter 53. The depth of tooth space below the pitch circle or the radial ANSWER: D dimension between the pitch circle and the bottom of the 44. The maximum compressive stress within the contact area tooth space. between mating gear tooth profiles. A. dedendum A. contact stress B. addendum B. hoop stress C. total depth C. bearing stress D. pitch depth