2. The critical speed of a shaft can be increased by
Correct : B. bearings may be brought closer together
3. A chain drive is used for
Correct : A. Distance is no criteria for such drives
4. In a tap set, the first tap used in thread cutting is
Correct : B. Taper tap
5. The pressure angle an involute gear profile gear
Correct : D. Remains constant
6. When both pinion and gear are made of the same material, then from the design point of view
Correct : A. Pinion is the determining factor
7. A rope sheave of balance weight for the cage is supported on an axle 25 cm. The maximum tension in the rope is 1500 kg. For safe design the point of application of the load should be considered at
Correct : E. Middle of span
8. A belt when struck vibrates at a particular frequency determined by
Correct : D. All of the above
9. In rolling bearings lubricant viscosity
Correct : C. is not determined by load
10. Which dynamometer will be most suitable for measuring the BHP of an automobile engine?
Correct : D. Hydraulic type
11. The property which refers to the relative ease with which a material can be cut is known as
Correct : C. Machinability
12. Fatigue failure starts at some
Correct : E. discontinuity
13. Sintered bearing
Correct : D. are self-lubricating type suitable for placs where regular maintensance is difficult
14. Hysteresis and eddy current losses in bearings are typical to
Correct : C. electromagnetic bearings
15. An induction motor meant for operation on 60 cycles per second is connected to a supply having 50 cycles per second. What will happen
Correct : E. The operating speed of the motor will be less than the rated
16. The buckling load depends on
Correct : D. All of the above
17. The maximum efficiency of a scres jack provided with square threads and angle of friction 30? will be
Correct : D. 33%
18. The bearing used in railway wagons are
Correct : A. Roller bearings
19. Which of the following operation causes residual compressive stress on the surface of the material?
Correct : D. All of the above
20. Which type of bearing is provided at the big end of connecting rod?
Correct : E. Ball bearing
21. Which of the following fits can be used for selective assembly?
Correct : C. Shrink fit
22. A block weighing 1000 kg rests on a horizontal surface. The coefficient of friction is 0.3 (both static and kinetic). What frictional force will be developed if the force applied to the block in the direction parallel to the horizontal surface is 40 kg
Correct : C. 30 kg
23. Which type of coupling will be preferred for connecting two shafts having relative speed?
Correct : D. Fluid coupling
24. As far as possible adhesive joints should be loaded in
Correct : A. shear
25. The basic shaft is
Correct : A. One which has no upper deviation
26. In flange coupling the weakest element should be
Correct : C. Key
27. The light gauge steel structural members are generally
Correct : D. cold formed
28. In general, the bunkers are constructed
Correct : B. square and rectangular in plan
29. In case of a cotter joint the compressive load is transmitted from one rod to another rod
Correct : D. Via collar
30. The shock absorbing capacity of a bolt is increased by
Correct : C. Making shank diameter equal to the core diameter
31. When a nut is tightened by placing a washer under it, the bolt tends to fall in
Correct : B. tension
32. 100 m of water column is equal to
Correct : B. 1000 kN/m2
33. Jaw clutches are generally used for
Correct : D. low horse power low rpm applications
34. Which of the following fit can be used for interchangeable assembly
Correct : C. Sung
35. Within elastic limits the greatest amount of strain energy per unit volume that a material can absorb is known as
Correct : C. Proof resilience
36. A double start screw has
Correct : D. Two threads at some phase angle
37. For butt welding of two plates each of which is 25 mm thick, the best process would be
Correct : A. Electron slag welding
38. The stretching in a belt is controlled by
Correct : B. Reducing stress in the belt
39. A positive infinitely variable (P.I.V.) system utilises
Correct : A. Variable pitch chain drive system
40. Which oil has highest specific gravity?
Correct : A. Castor
41. Within the elastic range, the bulk modulus of elasticity is defined as the ratio of
Correct : A. hydrostatic stress to the volumetric strain
42. In case of aircraft body the type of welding generally used is
Correct : E. None of the above
43. A spring deflects 50 mm under a 250 kg load. If the load is applied gradually, the energy absorbed by the spring will be
Correct : D. 625 kg-cm
44. In a shaft, the shear stress is not directly proportional to
Correct : B. length of the shaft
45. In which component a ball or roller bearing cannot be used?
Correct : E. Big end of connecting rod
46. Muntz metal contains
Correct : E. Copper-zinc
47. The deep bins are the containers in which the plane of rupture intersects
Correct : E. the opposite face (wall) near the top
48. For design purpose a spur gear tooth is considered
Correct : A. As a cantilever
49. A 20 HP 1500 r.p.m. induction motor will take current of nearly
Correct : A. 20-30 Amp
50. Gears for wrist watches are generally manufactured by
Correct : B. Helix angle
51. For a parallel load on a fillet weld of equal leg the plane of maximum shear occurs
Correct : C. At 45? to the horizontal
52. Which of the following types of gears are free from interference?
Correct : A. Cycloidal
53. A section is subjected to reversal of stresses. Choice exists for selecting any of the following section. Which one should be selected?
Correct : D. Hollow pipe
54. For the plastic analysis, the criterion for the analysis of a structure is based upon
Correct : C. ultimate load
55. Two plates are joined by a parallel fillet welds. The plates are subjected to a tensile load of 35000 kg. If the allowable shear stress for the weld material be 800 kg the minimum length of 15 mm weld required to resist this load would be
Correct : A. 41 cm
56. A spherical metal vessel 120 cm diameter is subjected to an internal pressure of 15 kg/sq cm. If the permissible stress is 625 kg/sq cm and the efficiency of the riveted joints is 75%, the required thickness of the plate would be
Correct : A. 10 mm
57. Belt slip may occur due to
Correct : B. Any of above
58. The plastic hinge in a section is caused when
Correct : A. all the fibres at a section reach the yield state
59. The thickness of a gear tooth is measured
Correct : A. Along the pitch circle
60. The life of a ball bearing is usually given in
Correct : C. either of (A) or (B) above
61. In bolts the stress in the unthreaded area (the shank) is
Correct : A. lower
62. Life of a rolling bearing as listed in a catalogue is usually
Correct : A. minimum expected life
63. For the same power transmission, V-belts are
Correct : D. narrow, thicker
64. Which of the following alloying metal for steels acts as a deoxidizing and desulphurising agent?
Correct : D. Tungsten
65. The coefficient of friction in a rolling bearing is of the order of
Correct : E. 0.001
66. According to Indian Boiler Regulations the essential requirement of any safety valve is that
Correct : C. Its area should be sufficient to discharge the steam as quickly as it is generated with rise in pressure not more than 10% of the safety valve blow off pressure
67. Which of the following material is not suitable for impact loads?
Correct : A. Cast iron
68. The fatigue limit of a material
Correct : A. Is greatly decreased by poor surface conditions
69. The material of a flt spiral spring is in a state of
Correct : B. pure bending
70. Safety valve used on locomotive boilers is generally of
Correct : C. Spring type
71. The limit design of steel structures makes use of
Correct : D. plastic analysis of structures
72. Gas lubricated bearings are used for
Correct : E. very high rpm and low load applications
73. In a ball bearing a ball is subjected to
Correct : D. Cyclic stress or fatigue
74. Backlash is
Correct : C. The amount by which the width of a tooth space exceeds the thickness of the engaging tooth on pitch circle
75. A cantilever beam of square section is subjected to a load W at the free end. If the length of the beam is increased and load reduced to half the deflection at the free end as compared to original deflection would be
Correct : A. 4 times
76. Forced vibrations
Correct : D. Are independent of natural frequency
77. Bearings provided on passenger coaches in railway are
Correct : D. Roller bearings
78. A coarse scres of major diameter 6 mm is designated as
Correct : B. M 6
79. A reinforced concrete beam is considered as made of
Correct : E. Heterogeneous material
80. In concrete mixer, the bevel gears for rotating the drum are generally
Correct : E. Casted
81. By using large thread angles in lifting machine
Correct : D. The mechanical advantage will be low
82. The holding power of sunk key is due to resistance which it offers in
Correct : C. Shear and crushing
83. Transverse fillet welded joints are designed for
Correct : C. tensile, shear
84. The crest diameter of a screw thread is same as
Correct : B. Major diameter
85. All the dimensions for a standard system of interchangeable gears can be defined in terms of
Correct : C. Pressure angle and pitch
86. Which of the following theory is also known as maximum shear stress theory of the failure of a material at the elastic limit
Correct : B. Guests Tresca theory
87. A fillet weld having axis parallel to the direction of the applied load is known as
Correct : A. side fillet weld
88. As per Indian Boilers regulations the type of joint preferred for longitudinal joint is
Correct : A. Reveted butt joint
89. In case of ball bearing
Correct : E. Inner race, outer race and balls should be equally hardened
90. The minimum thickness of steel members exposed to weather and accessible for painting is
Correct : B. 6 mm
91. In case of brittle material the theory of elastic failure generally applied is
Correct : B. Maximum principal stress theory
92. Stone erusher rolls are generally made
Correct : B. High carbon steel
93. The natural frequency of a shaft in bending is
Correct : A. Nearly the same as the critical speed
94. Which of the following key transmits power through frictional resistance only
Correct : B. Saddle key
95. In the case of a cantilever, irrespective of the type, loading of the maximum bending moment and maximum shear force occur at
Correct : E. Fixed end
96. Manganese in steel increases its
Correct : C. Tensile strength
97. The diameter of a washer is generally
Correct : C. Slight more than the diameter of the bolt
98. If a square key and the shaft are to be of the same material and of equal strength, the length of key would be (d = dia. Of shaft)
Correct : A. 1.23 d
99. The segmental bottom of a circular tank is subjected to
Correct : B. hoop compression
100. The pitch of 24 mm diameter metric threads would be