Correct : C. Made of chilled cast iron for water resistance
3. Bush bearings are
Correct : D. White metal alloys
4. In a cotter joint in order to ensure that cotter does not work back
Correct : A. The taper on cotter should not exceed 1 in 24
5. Cold working of materials
Correct : A. Increases the fatigue strength
6. A motor weighing 2000 kg is to be lifted by wrought iron eye bolt, screwed into the frame. Clioose-single bolt out of the following
Correct : A. M 30 coarse threads
7. An induction motor stator is cooled by
Correct : A. Air
8. The following property is the most important for normal used for gas turbine blades
Correct : C. Creep
9. The efficiency of a screw track is maximum when its helix angle '?' is equal to
Correct : B. 45 - ?/2
10. When a section of a beam is plastified due to given system of loading then
Correct : A. the length of beam over which the moment is geater than or equal to the yield moment is plastified
11. Normally a spring operates within
Correct : E. Elastic limits
12. Non-metallic gears have
Correct : A. Low noise at higher speeds and low load carrying capacity
13. What should be the thickness of a cast iron pipe 45 cm diameter if it is required to sustain 6 kg/sq cm inside pressure ? The maximum stress in the pipe material being limited to 140 kg/cm2
Correct : B. 10 mm
14. A stud is
Correct : B. Headless scew
15. Which of the following is a positive clutch?
Correct : C. Jaw clutch
16. In case of spur gears the higher pressure angle results in
Correct : A. Wider base and stronger teeth
17. The pitch circle of a cam is
Correct : D. The circle with centre as the centre of cam axis and radius such that it passes through the point
18. If during operation of a boiler one of the riveted joints is found leaking
Correct : D. The joint is repaired if in low pressure zones otherwise boiler sent for repairs
19. When a nut is tightened by placing a washer below it, the bolt will be subjected to
Correct : A. Tension
20. In case of Vee belt
Correct : A. The belt should not touch the bottom of groove in the pulley
21. Which of the following is not the advantage of V-belts over flat belts?
Correct : B. Less axial space requirement
22. The curve traced by a point on a line as the line rolls on another curve is known as
Correct : B. Involute
23. The included angle in Acme threads is
Correct : D. 29?
24. The differential equation 10x + 200 x + 810x = 0 describes one degree of freedom system. The system is
Correct : C. Having more than critical damping
25. A column has its equivalent length equal to its length in case of
Correct : D. both ends hinged
26. The period during which a cam follower does not move is known as
Correct : B. Swell period
27. A 3 mm diameter rivet must be squeezed to form a head. When yield stress in tension for this alloy is 125 Kpa, the minimum value of initiating force must be not less than
Correct : A. 500 N
28. Rankine formula is valid upto slenderness ratio of
Correct : D. 120
29. Tack welding
Correct : B. Is a type of weld
30. Which is the lightest?
Correct : E. 1 U.S. short ton
31. M 10 secrews have a pitch of
Correct : B. 1.25 mm
32. Springs are used
Correct : E. Any of the above
33. Which of the following is not a symmetrical section
Correct : C. Equal angle iron
34. The cross-section of a standard fillet weld is a triangle with base angles of
Correct : A. 45? and 45?
35. A key that transmits power through frictional resistance only is
Correct : A. Saddle key
36. The column which has the highest equivalent length has
Correct : A. Both ends fixed
37. Where a spring with a spring rate that increases with load is desired
Correct : D. Conical spring are used
38. Lowest value of joint efficiency is assumed in case of
Correct : C. Single riveted lap joints
39. The rated life of a ball bearing vaires
Correct : A. Inversely as cube of load
40. IC engine cylinders are lubricated by
Correct : A. thin film lubricated
41. Hydraulic testing of boilers is done at pressures
Correct : D. At 1
42. In case of pressure vessels having open ends the fluid pressure induces
Correct : C. circumferential stress
43. Size of rivet is specified by
Correct : D. Shank diameter
44. For very heavy loads which of the following gear tooth profile will be preferred?
Correct : D. 14
45. How many revolutions per minute one radian per second is equal to
Correct : C. 9.549
46. Gantry girders are invariably designed to resist
Correct : C. transverse, lateral and axial load
47. The size of the fillet weld is given by
Correct : D. smaller side of the triangle
48. Cast iron bearings are used
Correct : D. when cost is the major consideration
49. Splined shafts are most commonly used in
Correct : C. automobiles
50. The deflection of a helical spring is
Correct : D. Directly proportional to d4
51. The column splice is used to increase
Correct : C. length of the column
52. For which of the following gears noise level is low
Correct : C. non metallic gears
53. For steel ultimate strength in tension compared to that in shear is
Correct : B. 3?2
54. In a ball bearing a sleeve is fixed to
Correct : C. Prevent relative axial movement between the shaft and bearing
55. Resilience : Strain energy :
Correct : B. Velocity : Kinetic energy
56. A boiler shell 280 cm diameter and plate thickness 12 mm is subjected to an internal pressure of 1.2 MN/m2. The hoop stress will be
Correct : B. 60 N/m2
57. The amount of energy required upto fracture is known as
Correct : C. Toughness
58. Which threads have better fatigue characteristics?
Correct : C. Increasing the diameter of threaded portion
59. The minimum thickness of steel members exposed to weather and accessible for paintng is
Correct : B. 10 mm
60. In case of automobile body work the type of welding generally used is
Correct : C. Spot welding
61. A steel that has been deoxidized with a strong de-oxidizing agent, such as Silicon or Aluminium in order to eliminate a reaction between C and O2 during solidification, is known as
Correct : B. Kolled steel
62. Shear strain energy theory of the failure of a material at elastic limit is due to
Correct : E. Von Mises
63. The cam used for high speed engines is
Correct : A. Cycloidal
64. The Euler's formula for columns is valid for
Correct : B. large slenderness ratio
65. The ratio of maximum shear stress to average shear stress for a circular section is
Correct : E. 4?3
66. Which of the following is used as bearing lines
Correct : C. Babbit metal
67. A bushed pin flexible type coupling is used to join two shafts which
Correct : A. Are not in exact alignment
68. For a circular section the ratio of the plastic moment capacity to the yield moment capacity is
Correct : E. 1.7
69. Snap head rivets are used in
Correct : A. Structural work
70. In oilless bearings
Correct : A. There is no external supply of lubricant
71. Maximum principal stress theory is applicable for
Correct : D. Brittle materials
72. On a triple thread screw
Correct : B. Lead = 3 x pitch
73. A pair of straight tooth bevel gears connects a pair of shafts at 90?. The velocity ratio is 3:1. The cone ptich angle of the pinion will be
Correct : D. 18.4?
74. Key normally used in wrist watch is
Correct : E. None of the above
75. Cap screws are
Correct : D. Similar to small size bolts except that a great variety of shades of heads are available
76. Gears preferred for minimum axial thrust are
Correct : D. Herring bone gears
77. In case of springs in order to achieve greater load carrying capacity when the outer diameter is limited
Correct : D. Concentric springs are used
78. In the Laminated springs, the flat plates of different lengths are provided for
Correct : D. Equal distribution of stress
79. The most common material for the balls and races of ball bearings is
Correct : C. high chromium steel
80. A key seldom fails in
Correct : B. tearing
81. A suspended body is to be struck heavily without producing any reaction at the support. It should be hit at
Correct : E. Centre of percussion
82. Beams composed of more than one material, regidly connected so as to behave as one piece are known as
Correct : D. composite beams
83. Low pressure angle on gears is likely to result in
Correct : A. Weaker teeth
84. The trunions of a mixing machine have an effective length of 30 cm and the weight coming on each trunion is 1250 kg. If the fibre stress is not to exceed 350 kg/sq-cm the diameter of the trunions should be
Correct : B. 8 cm
85. The holding power of a saddle key is due to
Correct : D. Friction force
86. In order to minimise jerks, the type of cam used is
Correct : A. Cycloidal
87. Which of the following bearing will have least coefficient of friction?
Correct : B. Tapered bearing
88. Abrasion wear of gear tooth occurs due to
Correct : C. Presence of foreign particles
89. A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw is called
Correct : D. ring nut
90. The angle through which a gear turns from the beginning of contact of a pair of teeth until the contact reaches the pitch point, is known as
Correct : A. Angle of approach
91. The surface endurance limit of gear material is dependent on its
Correct : B. Surface hardness
92. Yield point in static loading as compared to that in fatigue loading is
Correct : D. Higher
93. Slenderness ratio of the lacing bar for compression member should not exceed
Correct : E. 145
94. The value of load factor which accounts for margin of safety in plastic design for gravity loads is about
Correct : A. 1.85
95. The purpose of providing multiple collars on a flat collar pivot bearing is to
Correct : D. Distribute the axial load becase of limiting bearing pressure on a collar
96. Bolted joints often fail in
Correct : A. tension only
97. A series of continuous spot welds
Correct : E. seam weld
98. A shaft coupling should
Correct : C. have all the above characteristics
99. Eye bolts are used for
Correct : D. Lifting and transporting heavy pieces