Mechanical Engineering Quiz PDF

A machine part that supports another part, which rotates, slides or oscillateds in or on it A. Journal B. Bearing C. Roller D. Casing 2. The part of a shaft or crank which is supported by and turns in bearing. A. Casing B. Bushing C. Roller D. Journal 3. It is also called ant...

A machine part that supports another part, which rotates, slides or oscillateds in or on it A. Journal B. Bearing C. Roller D. Casing 2. The part of a shaft or crank which is supported by and turns in bearing. A. Casing B. Bushing C. Roller D. Journal 3. It is also called anti-friction bearing. A. Rolling bearing B. Thrust bearing C. Tapered bearing D. Single row bearing 4. Which of the following is a bearing material? A. Babbitt B. Bronze C. Plastics D. All of the above 5. It acts toward the center of the bearing along a radius. A. Thrust load B. Tangential load C. Radial load D. Peripheral load 6. Conrad bearing is also known as A. Needle bearing B. Ball bearing C. Roller bearing D. Tapered bearing 7. The combined effect of many of the variables involved in the operation of a bearing under hydrodynamic lubrication can be characterized by the dimensionless number called: A. Reynolds Number B. Prandtl Number C. Grashof Number D. Sommerfeld Number 8. It exits primarily to guide the motion of a machine member without specific regard to the direction of load application. A. radial bearing B. Journal bearing C. Thrust bearing D. Guide bearing 9. It carries a load collinear to the axis of possible rotation of the supported member. A. Guide bearing B. Journal bearing C. Thrust bearing D. Radial bearing 10. The 400 series bearing is called: A. Light B. Medium C. Heavy D. Extra heavy 11. Refers to the axial distance from a point on one coil to the corresponding point on the next adjacent coil. A. Lead B. Spring distance C. Pitch D. Spring deflection 12. The spring index for general industrial uses should be A. 5 to 7 B. 6 to 8 C. 7 to 9 D. 8 to 10 13. What is the spring index of valve and clutch? A. 3 B. 5 C. 7 D. 9 14. Refers to the space between adjacent coils when the spring is compressed to its operating length A. Coil allowance B. Coil tolerance C. Coil clearance D. None of these 15. The most practical spring designs produce a pitch angle is less than A. 12° B. 15° C. 20° D. 25° 16. Engine valves get shut by means of A. Valve lock B. Tappet C. Valve spring D. Adjusting screw 17. Which of the following materials is used for leaf and coil spring? A. AISI 3140 B. AISI 3150 C. AISI 3240 D. AISI 4063 18. The circumference of a coil spring times the effective number of coils is called A. Active length B. Solid length C. Compressed length D. Operating length 19. For spring subjected to light service, the factor of safety \_\_\_\_\_\_\_\_\_\_ is suggested A. 1.5 B. 2.0 C. 2.5 D. 3.0 20. Refers to a flat or curved made of thin superimposed plates and formin a cantilever or beam of uniform strength. A. Laminated spring B. Graduated spring C. Full spring D. Conical spring 21\. The efficiency of hydraulic braking system is A. about 90% B. 60-80 % C. 50-60 % D.40-50 % 22\. The SAE recommends an angle of \_\_\_\_\_\_\_\_\_ for cone clutches faced with leather asbestos or having cork inserts. A. 7.5 degrees B. 9.5 degrees C. 12.5 degrees D. 14.5 degrees 23\. Why does a clutch creates noise? A. Clutch release bearing is either dry or defective B. Clutch spring is broken C. Clutch is faulty D. all of the above 24\. what faults develop in the brakes? A. brakes do not work properly B. brakes do not disengage3 C. brakes makes noise D. all of the above 25\. which of the following types of brakes are also changed while replacing brake lining? A. brake shoes B. shoe rivets C. shoe spring D. block brake 26\. Power brakes require \_\_\_\_\_\_\_\_\_ power. A. equal B. less C. more D. pulsating 27\. What type of oil used in the hydraulic system? A. Engine oil B. Gear oil C. Brake oil D. Clutch oil 28\. The principal parts of a hydraulic brake system are the master cylinder and the A. multi cylinder B. wheel cylinder C. brake wire D. brake shoe 29\. In the mechanical brake system the main function is of A. spring B. cam C. shoe adjuster D. shoe rivets 30\. In the motor vehicles, there is a \_\_\_\_\_\_\_\_\_ in addition of foot brake A. hand brake B. hydraulic brake C. mechanical brake D. band brake 31\. the breaking strength of oak tanned belting varies from 3 to more than A. 5 ksi B. 6 ksi C. 7 ksi D. 8 ksi 32\. if the ends are joined by wire lacing with machine the usual efficiency of joint is A. 75 % B. 85 % C. 88 % D. 100 % 33\. The tension in the belt due to centrifugal force increases rapidly above A. 2500 fpm B. 3000 fpm C. 3500 fpm D. 4000 fpm 34\. Experience suggest s that the most economical designs are obtained for a belt Speed of A. 2000 to 3000 fpm B. 3000 to 4000 fpm C.4000 to 4500 fpm D. 4000 to 4000 fpm 35\. For leather belts recommended speed is A. 2000 to 300 0 fpm B. 4000 to 5000 fpm C. 6000 to 7500 fpm D. 7000 to 8000 fpm 36\. for fabric belts recommended speed is A. 2000 to 3000 fpm B. 2000 and more fpm C. 3000 to 4000 fpm D. 4000 to 4500 fpm 37\. on high speed centrifugal blowers, it has been observed that the arc of contact reduced from 180 degrees at rest to\_\_\_ in motion A. 90 deg B.95 deg C. 100 deg D. 110 deg 38\. the recommended initial tension of belt is A. 75 lb/in of width B. 71 lb/in of width C. 73 lb/in of width D. 80 lb/in of width 39\. the recommended net belt pull for rubber belt is A. 11.34 lb/ply per inch of width B. 13.75 lb/ply per inch of width C. 16.35 lb/ply per inch of width D. 20.34 lb/ply per inch of width 40\. if two intersecting shafts are to be belt connected how many guide pulley is used. A. 1 B. 2 C. 3 D. 4 41\. the distance helical gear worm would thread along its axis in one revolution if it were free to move free to move axially is called A. lead B. thread C. pitch D. land 42\. range of helix angle on helical gear is \_\_\_\_\_\_\_\_ A. less than 18 B. 15-25 C. 20-35 D. 35-40 43.what will be the effect in bushing gears without backlash? A. jamming B. overheating C. overload D. all of these 44\. the amount by which the width of a tooth space exceeds the thickness of the engaging tooth on the pitch circles. A. backlash B. clearance C. undercut D. chordal thickness 45\. height of tooth above pitch circle or radial distance between pitch circle and top land of the tooth is called A. top tooth B. addendum C. land D. hunting 46\. I involutes teeth, the pressure angle is often defined as the angle between the line of action and the line of tangent to the pitch circle. It is termed as A. helix angle B. angle of recess C. angle of obliquity D. arc of action 47\. the reciprocal of a diametral pitch or the ratio of pitch diameter to number of teeth is called A. lead B. module C. involute D. clearance 48\. for evenly distributed and uniform wear on each meshing gear tooth the ideal design practice is to consider a A. wear resistance alloy addition to tooth gear B. heat treatment of the gears C. hardening of each D. hunting tooth addition 49\. \_\_\_\_\_\_\_\_\_ used to transmit power at high velocity ratios between non- intersecting shafts that are usually but not necessarily at right angle A. helical gear B. bevel gear C. worm gear D. spiral gear 50\. a gear design, the ratio of the pitch diameter in inches to the number of teeth is called A. module B. diametral pitch C. English module D. circular pitch 51\. A circle the radius of which is equal to the distance from the axis to the pitch point A. pitch circle B. root circle C. base circle D. outside circle 52\. ratio of pitch diameter to the number of teeth. A. diametral pitch B. module C. contact ratio D. helical overlap 53\. a kind of gear used for heavy duty works where a large ratio of speed is required and are extensively used in speed reducer is known as A. worm gear B. spiral gear C. helical gear D. bevel gear 54\. the ratio of the number of teeth to the number of mm of pitch diameter equals number of gear teeth to each mm pitch diameter. A. diameter pitch B. Module C. Circular pitch D. English module 55\. the depth of tooth space below the pitch circle A. dedendum B. working depth C. full depth D. tooth depth 56\. the total depth of a tooth space equal to addendum plus dedendum A. full depth B. working depth C. whole depth D. dedendum 57\. a circle coinciding with a tangent to the bottom of the tooth space A. root circle B. pitch circle C. addendum circle D. dedendum 58\. the diameter of a circle coinciding with the top of the teeth of an internal gear A. pitch diameter B. root diameter C. internal diameter D. central diameter 59\. a gear with teeth on the outer cylindrical surface A. outer gear B. external gear C. spiral gear D. helical gear 60\. addendum of a cycloidal gear tooth. A. cycloid B. epicycloids C. straight rack D. involute 61.The spiral bevel gears are recommended when the pitch line speed exceeds A.1000 rpm B.1100 rpm C.1500rpm D.2000 rpm 62\. When the pitch line speed is above 8000 fpm the teeth should be A. ground after hardening B. should be cooled in air C. should be quenched after D. none of these 63\. \_\_\_\_\_\_have curved teeth as in spiral bevels, but with zero spiral angles. A. Spiral gears B. Zerol bevel gears C. Zero bevel gears D. Straight bevel gears 64\. \_\_\_\_\_\_is a gear that has an advantage of smoother tooth engagement quietness of operation greater strength and higher permissible speeds. A. Zerol bevel gears B. Straight bevel gears C. Hypoid bevel gears D. Spiral bevel gears 65\. When the pair of bevel gears of the same size is on shafts intersecting at right angle, they are called \_\_\_\_\_\_. A. Mold gear B. Helix angle C. Miter gear D. Tangent gear 66\. The used of gearbox provides A. gear leverage B. more torque C. more speed D. none of these 67\. For equalizing the rotation of two gears, a gearbox employs. A.dog and clutch B. crown gear C. star pinion D. none of these 68\. In a constant mesh gearbox, all the speed gears remain A. separate B. joined to their couples C. of the same measurements D. none of these 69\. If a big gear moved by the small gear then the big gear A. will not rotate B. will rotate on reverse direction C. will rotate fastly D. none of these 70\. \_\_\_\_\_\_are bevel gears mounted on intersecting shaft at angle of other than 90 degrees. A. Right angle gears B. Half gears C. Inclined gears D. Angular gears 71\. The smallest diameter on a gear tooth with which the mating gear makes.. A. Idler B. Pinion C. Gear D. Central diameter 72.The ratio of the arc of action to the circular pitch is known as A. Contact ratio B. Action ratio C. Recess action D. Approach ratio 73\. The curved that satisfy the law of gearing. A. Tooth profile B. Stub curve C. Conjugate curve D. Involute curve 74\. The depth tooth space below the pitch circles or the radial dimension between the pitch circle and the bottom of the tooth space. A. Addendum B. Dedendum C. Working Depth D. Whole depth 75\. The circle that bounds the bottoms of the teeth. A. Addendum circle B. Pitch circle C. Base circle D. Dedendum circle 76\. The ratio of the number of teeth to the number of millimeters of pitch diameter. A. Diameter pitch B. Module C. Circular pitch D. Base pitch 77\. The Diameter pitch circulated in the normal plane and is equal to the pitch divide d by the cosine of helix angle. A. Normal diametral plane B. Normal diametral pitch C. Normal plane D. Normal axial pitch 78\. That portion of the face width that actually comes into contact with mating teeth, as occasionally one member of a pair of gears may have a grater face width than the other is called A. effective face width B. effective tooth face C. effective tooth thickness D. effective tooth flank 79\. The actual torque ratio of a gear set divided by its gear ratio. A. Coefficient of performance B. Transmission ratio C. Ratio factor D. Efficiency 80\. When it rolls along the outer side of another circle, it is called A. cycloid B. hypocloid C. epicycloids D. trochoid 81\. They are cylindrical in form operate on parallel axes and have straight teeth parallel to the axis. A. Helical gears B. Bevel gears C. Spur gears D. Worm gears 82\. The design stress was based upon the ultimate strength of the material with a factor of safety of about\_\_\_\_\_\_\_\_\_\_\_\_. A. 2 B. 3 C. 4 D. 5 83\. Safe working stress for common gear materials operating at very low velocities are usually assumed to be \_\_\_\_\_\_\_ the ultimate strength. A. one-forth B. one-third C. one-half D. two-third 84\. To avoid charring by the heat of friction, rawhide gears should not be operated of pitch line velocities greater than\_\_\_\_\_\_\_\_\_. A. 2500 fpm B. 3000 fpm C. 3500 fpm D. 4000 fpm 85\. The outside diameter of the hubs of larger gears should be \_\_\_\_ the bore for steel. A. 1.5 times B. 1.6 times C. 1.7 times D. 1.8 times 86\. The outside diameter of the hubs of larger gears should be \_\_\_\_ the bore for iron. A. 1.5 times B. 1.8 times C. 2.0 times D. 2.5 times 87.Helix angles of \_\_\_\_\_ degrees are preferred for single helical gears. A. 10 and 18 B. 12 and 20 C. 15 and 23 D. 18 and 28 88\. Helix angles of \_\_\_\_\_ degrees are preferred for double helical gears. A. 15 and 25 B. 20 and 30 C. 25 and 40 D. 30 and 45 89\. A \_\_\_\_\_\_\_ is a spur gear of infinite diameter. A. hypoid B. herring bone C. annular D. rack 90\. It is standard practice to assume that the thickness of the tooth measured around the pitch circle is exactly\_\_\_\_\_\_ of the circular pitch. A. one-forth B. one-third C. one-half D. two-third 91\. The \_\_\_\_\_\_\_\_\_\_ traced by the outermost corner of one tooth on the plane of the other gear. A. cycloid B. hypocycloid C. epitrochoid D. trochoid 92\. An imaginary circle passing through the points at which the tooth of the meshing gears contact each other. A. Pitch circle B. Base circle C. Addendum circle D. Dedendum circle 93\. A gear with teeth on the outer cylindrical surface. A. Rack gear B. Zerol gear C. Miter gear D. External gear 94\. The diameter of a circle coinciding with the top of the teeth of an internal gear. A. Dedendum diameter B. Pitch diameter C. Base diameter D. Internal diameter 95\. It is standard practice to assume that the thickness of the tooth measured around the pitch circle is exactly \_\_\_\_\_\_\_\_ the circle pitch. A. One half B. One third C. One fourth D. One fifth 96\. The helix angles for the herringbone gears are used from \_\_\_\_\_\_\_\_\_\_\_ for industrial gears. A. 10 to 15 B. 15 to 20 C. 20 to 30 D. 25 to 45 97\. The distance parallel to the axis from the pitch circle to the face of the shoulder or hub. A. back cone B. backing C. crown height D. apex distance 98\. A machine that makes gear teeth by means of a reciprocating cutter that rotates slowly with the work. A. Gear forming B. Gear hobber C. Gear shaper D. Gear cutter 99\. A type of gear wheels connecting non parallel, non intersecting shafts usually at right angles. A. Helical gear B. Herringbone gear C. Hypoid gear D. Bevel gear 100\. The angle between the plane of the pitch circle and a plane tangent to the large end of the tooth. A. Front angle B. Back angle C. Dedendum angle D. Face angle Prepared by: **KIMBERLY A. ANTAZO -- SAN JUAN, PME** Instructor **KEY TO CORRECTION** 1. B bearing 2. D journal 3. A Rolling bearing 4. D All of the above 5. C Radial load 6. B Ball bearing 7. D Sommerfeld number 8. D Guide bearing 9. C Thrust bearing 10. C heavy 11. C pitch 12. D 8 to 10 13. B 5 14. C Coil clearance 15. A 12° 16. C Valve spring 17. D AISI 4063 18. A Active length 19. A 1.5 20. A Laminated spring 21. A about 90 % 22. C 12.5 degrees 23. D all of the above 24. D all of the above 25. B shoe rivets 26. B less 27. C Brake oil 28. B wheel cylinder 29. B cam 30. A hand brake 31. B 6 ksi 32. C 88% 33. A 2500 fpm 34. C 4000 to 4500 fpm 35. D 7000 to 8000 fpm 36. B 2000 and more fpm 37. D 110 deg 38. B 71 lb/in. of width 39. B 13,75 lb/ply per inch of width 40. B 2 41. A lead 42. B 15-25 43. D all of these 44. A back slash 45. B addendum 46. C angle of obliquity 47. B module 48. D hunting tooth addition 49. C worm gear 50. C English module 51. A pitch circle 52. B module 53. A worm gear 54. A diametral pitch 55. A dedendum 56. C whole depth 57. A root circle 58. C internal gear 59. B external gear 60. B epicycloids 61. A.1000 rpm 62. A. ground after hardening 63. B. Zerol bevel gears 64. D. Spiral bevel gears 65. C. Miter gear 66. B. more torque 67. D. none of these 68. B. joined to their couples 69. B. will rotate on reverse direction 70. D. Angular gears 71. D. Central diameter 72. A. Contact ratio 73. C. Conjugate curve 74. B. Dedendum 75. D. Dedendum circle 76. A. Diameter pitch 77. B. Normal diametral pitch 78. A. effective face width 79. D. Efficiency 80. C. epicycloids 81. C. Spur gears 82. B. 3 83. B. one-third 84. A. 2500 fpm 85. D. 1.8 times 86. C. 2.0 times 87. C. 15 and 23 88. D. 30 and 45 89. D. rack 90. C. one-half 91. C. epitrochoid 92. A. Pitch circle 93. D. External gear 94. D. Internal diameter 95. A. One half 96. C. 20 to 30 97. B. backing 98. C. Gear shaper 99. C. Hypoid gear 100. B. Back angle