1. The gears on camshaft and crankshaft are known as
Correct : C. timing gears
2. The material known as high carbon high copper chrome silicon cast steel is used for making
Correct : A. camshaft
3. Camshaft gear is made from which material
Correct : C. bakelite
4. The main reasons for crankshaft wear are
Correct : D. all of the mentioned
5. The main causes of crankshaft vibration are
Correct : D. all of the mentioned
6. In the cam, the distance between the base circle and the nose is called
Correct : A. lift
7. The crankshaft rotates the camshaft using
Correct : B. chain drive
8. The crankshaft should be inspected for
Correct : D. all of the mentioned
9. A radial bearing supports the load that acts along the axis of the shaft.
Correct : B. false
10. Sliding contact bearings, also called plain bearings have no problem of wear.
Correct : B. false
11. Which of the following are true about plasticity?
Correct : D. all of the mentioned
12. Modulus of resilience is defined as
Correct : A. strain energy per unit volume
13. In gear boxes and small size motors, rolling contact bearings are used.
Correct : A. true
14. There is problem of alignment in deep groove ball bearings.
Correct : A. yes
15. Deep groove ball bearing has immense rigidity.
Correct : B. no it has point contact and hence low rigidity
16. Cylindrical load bearing has lower load capacity as compared to deep groove ball bearing.
Correct : B. false
17. Angular contact bearing can take thrust as well as radial loads.
Correct : A. true
18. The angular play bearing must be mounted without axial play.
Correct : A. yes
19. Taper rolling supports
Correct : C. both axial and thrust loads
20. Which of the following cannot tolerate misalignment?
Correct : D. all of the listed
21. Cylinder roller creates lesser noise than deep groove ball bearing.
Correct : B. false
22. Straight bevel gears are easy to design and manufacture and give reasonably good service with quieter operation.
Correct : B. no, noise problem
23. Which of the following creates smoother motion?
Correct : B. spiral bevel gears
24. When the pitch angle is greater than 90⁰, it is called external bevel gear.
Correct : B. internal
25. If pitch angle is >90, the bevel gear is?
Correct : A. internal
26. Crown gears having a pitch angle of 90⁰
Correct : C. >90
27. Which of the following are characteristics of skew bevel gears?
Correct : A. straight teeth
28. Hypoid gears are based on surfaces that are paraboloids of revolution.
Correct : B. false
29. When two hyperboloids are rotated, the resulting motion is
Correct : C. combination of turning and sliding
30. Zerol gears are straight bevel gears with zero spiral angle.
Correct : B. false
31. Zerol gears give lesser contact ratio.
Correct : B. no, larger contact ratio
32. Hydrodynamic lubrication takes place in region?
Correct : B. cd
33. Coefficient of friction is minimum at
Correct : C. c
34. Bearing modulus is the bearing characteristic number at
Correct : B. c
35. If viscosity of the lubricant is very low than BCN will lie in the region
Correct : A. bc
36. The fundamental equation for viscous flow is given by ∆pbhᵌ/6µl where symbols have their usual meanings.
Correct : B. 6 is to be replaced by 12
37. A single transverse weld is preferred over
Correct : B. false
38. Transverse fillet weld can be designed using the same equations as of parallel fillet weld.
Correct : B. false
39. Which of the following are functions of bearings?
Correct : D. all of the listed
40. Which of the following is measure of stiffness?
Correct : A. modulus of elasticity
41. Which of the following facts are true for resilience?
Correct : A. ability of material to absorb energy when deformed elastically
42. Shot blasting process improves the endurance limit of the component.
Correct : A. true
43. While designing a forging, the profile is selected such that the fibrous lines are parallel to the tensile forces and perpendicular to shear forces.
Correct : A. true
44. What is the expression of the bending equation?
Correct : A. m/i = σ/y = e/r
45. The bending stress is
Correct : A. directly proportional to the distance of layer from the neutral layer
46. The critical value at which crack extension occurs is called
Correct : C. fracture toughness
47. If for a curved beam of trapezoidal cross section, radius of neutral axis is 89.1816mm and radius of centroidal axis is 100mm, then find the bending stress at inner fibre whose radius is 50mm. Area of cross section of beam is 7200mm² and the beam is loaded with 100kN of load.
Correct : C. 100.6
48. Which of the following can be the factor of safety for a dead load?
Correct : C. 4
49. For which of the following design factor of safety the design will work properly?
Correct : C. 2
50. While designing shaft on the basis of torsional rigidity, angle of twist is given by?
Correct : B. 584ml/gd⁴
51. If allowable shear stress in the shaft is 70N/mm² and torsional and bending moments are M=1185000N-mm and m=330000N-mm, find the diameter of the shaft.
Correct : C. 44.7mm
52. Calculate the shaft diameter on rigidity basis if torsional moment is 196000N-mm, length of shaft is 1000mm. Permissible angle of twist per meter is 0.5’ and take G=79300N/mm².
Correct : B. 41.2mm
53. The stiffness of solid shaft is more than the stiffness of hollow shaft with same weight.
Correct : B. false
54. Solid shaft is costlier than hollow shaft of same weight.
Correct : B. false
55. Flexible shafts have rigidity in torsion making them flexible.
Correct : B. high
56. Flexible shafts have rigidity in bending moment.
Correct : B. low
57. A force 2P is acting on the double transverse fillet weld. Leg of weld is h and length l. Determine the shear stress in a plane inclined at θ with horizontal.
Correct : A. psinθ(sinθ+cosθ)/hl
58. Maximum shear stress in transverse fillet weld of leg h and length l is
Correct : B. 1.21p/hl
59. Hollow saddle key is superior to flat saddle key as far as power transmitting capability is concerned.
Correct : B. false
60. Saddle key is more suitable than sunk key for heavy duty applications.
Correct : B. false
61. The main advantage of sunk key is that it is a drive.
Correct : A. positive
62. Woodruff key permits movement b/w shaft and the hub.
Correct : B. radial
63. Determine the length of kennedy key required to transmit 1200N-m and allowable shear in the key is 40N/mm². The diameter of shaft and width of key can be taken as 40mm and 10mm respectively.
Correct : D. 53mm
64. Splines are keys.
Correct : A. true
65. Refer to fig.
Two plates are fastened by means of two bolts.
The yield strength of bolt is 400N/mm² and factor of safety is 4.
Determine the permissible shear stress in the bolts.
Correct : B. 50n/mm²
66. Determine the secondary shear stress acting on the bolt 3 and its direction. The bolts are equidistant having separated by 60mm and the margin to the left and right is 25mm.Also P=5kN acts at a distance of 200mm from the channel.
Correct : C. 6100n vertically up
67. Determine the size of the bolts if yield strength of bolt is 400N/mm² and factor of safety is 4. The bolts are equidistant having separated by 60mm and the margin to the left and right is 25mm. Also P=5kN acts at a distance of 200mm from the channel.
Correct : B. 13.44mm
68. Knuckle Joint can’t be used to connect two intersecting rods.
Correct : B. no, it can’t be used
69. A knuckle joint is also called socket pin joint.
Correct : B. false
70. If knuckle joint is to fail by crushing failure of pin in fork, then determine the diameter of knuckle pin when 50kN axial tensile force act on rods. Given: Max allowable compressive stress=25N/mm², thickness of each eye of fork=25mm.
Correct : A. 40mm
71. Can the cotter joint be used to connect slide spindle and fork of valve mechanism?
Correct : A. true
72. Among gas and electric arc welding, which has the higher rate of heating?
Correct : B. electric arc welding
73. Forge welding involves heating of parts to elastic stage and joint is prepared by impact force.
Correct : B. no, it is done up to plastic stage
74. Which of the following isn’t a main part of rivet?
Correct : D. thread
75. In hot riveting the shank portion is subjected to compressive stress.
Correct : B. false
76. Among punching and drilling, punching is safer.
Correct : B. false
77. What is the amount of sea coal needed in cast irons for small casting moulding sands?
Correct : A. 1%
78. The longest leaf in a leaf spring is called centre leaf.
Correct : B. it is called master leaf
79. If the spring is compressed completely and the adjacent coils touch each other,the the length of spring is called as?
Correct : A. solid length
80. If uncompressed length of spring is 40mm and number of coils 10mm, then pitch of coil is?
Correct : B. 40/9
81. Active and inactive, both types of coils support the load although both don’t participate in spring action.
Correct : B. inactive coils don’t support the load
82. The coefficient of fluctuation of speed is the of maximum fluctuation of speed and the mean speed.
Correct : B. ratio
83. If E = Mean kinetic energy of the flywheel, CS = Coefficient of fluctuation of speed and Δ E = Maximum fluctuation of energy, then
Correct : B. Δe = e2 × cs
84. The tensile stress in the flywheel rim due to the centrifugal force acting on the rim is given by
Correct : D. ρ v2
85. In a four stroke cycle engine camshaft revolves at the crank speed.
Correct : B. half
86. Crankshafts are usually constructed by
Correct : B. drop forging
87. A bearing supports the load acting along the axis of the shaft.
Correct : A. thrust
88. In steam and gas turbines, rolling contact bearings are used.
Correct : B. false
89. Deep groove ball bearings creates a lot of noise.
Correct : B. they create very less noise
90. In angular contact bearings, bearings are required to take thrust load in both directions.
Correct : C. 2
91. Which of the following isn’t the property of taper roller?
Correct : C. take low radial and heavy loads
92. Which of the following cannot take radial load?
Correct : C. thrust ball bearing
93. There are common types of bevel gears.
Correct : B. 2
94. Miter gears are the bevel gears mounted on shaft which are intersecting at angle greater than 90.
Correct : B. false
95. In hypoid bevel gears, shafts may continue past each other.
Correct : A. true
96. Hypoid gears have the following characteristics.
Correct : D. all of the mentioned
97. The bearing characteristic number shown in the graph is directly proportional to the unit bearing pressure.
Correct : B. false
98. A single transverse weld is preferred over double transverse fillet weld.