1. If two gears having 24 and 96 teeth mesh each other, they must have been cut
Correct : C. With cutters of same moduic
2. The following type of mechanism is not possible in any framed structure as an independent mechanism
Correct : A. Joint mechanism
3. A solid shaft and a hollow shaft are to be of equal strength in torsion. The hollow shaft is to be 10% larger in diameter than the solid shaft. The ratio of the weight of the hollow shaft will be (both shafts being made of same material)
Correct : C. 2
4. The maximum size of the fillet weld that can be used is
Correct : B. 3 mm
5. Spring driven watches and clocks utilise
Correct : D. Cycloid gears
6. The shape or form factor is introduced in the design of compression members to represent the effect of
Correct : C. local buckling
7. The plastic design of steel structures which is based on upper bound theorem is
Correct : E. unsafe, safe
8. Poisson's ratio for rubber is taken as
Correct : E. 0.5
9. In above problem the cone pitch angle of the pinion will be
Correct : D. sin-1 0.5
10. Cycloidal profile gears are used in
Correct : D. Watches and clocks
11. The ratio of lateral strain to linear strain is
Correct : D. Poisson ratio
12. In case of worm and worm wheel drives, the axes of the two are
Correct : D. non-parallel and non-intersecting
13. A close coiled helical spring is compressed. Its wire is subjected to
Correct : C. Tension
14. The plastic design of a structure based on which of the following is always safe?
Correct : B. Statistical method of plastic analysis
15. In the case of ball bearings the contacting areas between balls and running tracks are
Correct : C. elliptical
16. The notch angle of Izod impact test specimen is
Correct : C. 45?
17. Scraping of lathe bed helps in
Correct : A. lubrication
18. In an inverted tooth chain the included angle between the outer faces of the teeth?
Correct : C. 60 to 75
19. The value of yield stress for structural steel is about
Correct : E. 2600 kg/cm2
20. A warm gear is generally made of
Correct : C. Cast iron
21. The diameter of rivets for 20 mm thick plates would be
Correct : D. 40 mm
22. The ratio of the plastic moment capacity to the yield moment capacity of a rolled steel beam section is about
Correct : C. 1.15
23. Which pair of gears usually has high friction losses?
Correct : E. Worm and worm wheel
24. In plastic analysis, the shape factor of a triangular section is
Correct : C. 2.34
25. In case of quadruple riveted butt joints the joint efficiency is usually assumed in the range
Correct : C. 85-95%
26. A V-belt having B section is generally used when the power to be transmitted is in the range
Correct : E. 3-25 HP
27. In which of the following gears the lowest degree of accuracy can be expected
Correct : C. Farm machinery
28. Induction motors are generally provided with
Correct : C. Ball or roller bearings
29. Which of the following gears are free from axial thrust?
Correct : E. Herringbone gears
30. The phenomenon of eloggation and contraction of the belt is known as
Correct : B. Creep
31. Rankine theory is applied to
Correct : A. bruite materials
32. The clamping nut of the turn buckle has
Correct : C. Right hand threads on one side and left hand threads on the other side
33. Helical springs are not subjected to
Correct : D. Hoop stress
34. The uniform rate of descent is maintained by a brake on the drum which applies the necessary torque of 300 kg-m what additional brake torque is required to bring the system to rest in 0.50 second?
Correct : C. 2054 N-m
35. The part of the tooth which lies between the pitch and dedendum circle is known as
Correct : E. Flank
36. Total strain energy theory for the failure of a material at elastic limit is also known as
Correct : B. Von mises theory
37. A solid shaft of 100 mm diameter transmits 100 HP at (450/?) r.p.m. The torque in kg-m on the shaft would be
Correct : C. 500
38. Stone crusher rolls are generally made of
Correct : E. High carbon steel
39. The 'crowning' of flat pulleys is generally done
Correct : C. To prevent the belt from running off the pulley
40. Piston rings are usually made of
Correct : B. Cast iron
41. The main difference between rigid and flexible coupling for shafts transmitting power is
Correct : B. a flexible element is inserted around coupling bolts in one of the flanges
42. Teflon is used for bearings
Correct : A. When low coefficient of friction is desired
43. In case of a Saddle key
Correct : C. The key ways is cut in hub only
44. For determination of allowable stress in axial compression, IS : 800-1962 has adopted
Correct : B. Secant formula
45. Braking system on earth moving machinery is
Correct : C. Hydraulic braking
46. In a butt welded joint, the size of weld is
Correct : A. 0.5 times the throat of weld
47. The shape factor of an isosceles triangle for bending about the axis parallel to the base is
Correct : C. 2.34
48. A pivoted segment type thrust bearing is used in order to provide
Correct : B. A converging film of oil
49. The pitch of threads on a lock-nut is
Correct : D. Same as that of nut
50. Aircraft body is
Correct : B. Riveted structure
51. The weakest plane in a fillet weld is
Correct : A. the throat
52. The holes in plates for reveting are usually made by
Correct : D. Drilling
53. Which of the following treatment is often recommended for parts operating under corrosive conditions?
Correct : B. tempering
54. A material is generally classified as brittle if the percentage elongation (in a gauge length of 50 mm) is less than
Correct : D. 5%
55. A flange coupling is
Correct : B. Used for collinear shafts
56. Splines are used when
Correct : A. Axial relative motion between shaft and hub is necessary
57. Bolts in structures are often tightened upto or beyond the yield point because
Correct : C. it improves endurance strength
58. A triple threaded worm has a pitch diameter of 100 mm and an axial pitch of 22 mm. The lead angle will be
Correct : A. tan-1 0.21
59. Spigot and socket joints are used on pipes
Correct : A. Which are buried underground
60. In a compression test the fracture in cast iron specimen would occur along
Correct : A. An oblique plane
61. If the allowable shear stress is 960 kg/sq. cm for the size h cm, the allowable force per cm of weld length would be
Correct : A. 670 h
62. In case of a knuckle joint the pin is likely to fail in
Correct : C. Double shear
63. Shot peening leaves the material surface in
Correct : C. residual compressive stress
64. A Babbit is
Correct : E. Antimony bearing lead or tin alloy
65. Low pressure angle on gears results in
Correct : A. Weaker teeth
66. An eye bolt is generally provided on
Correct : C. Electric motors
67. The satisfactory method of reclaiming worn out and under sized part subject to fatigue loads is
Correct : C. Electroplating
68. The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is
Correct : A. 1 micron
69. Dead weight type safety valve is not used on locomotives because
Correct : B. It is susceptible to vibratory forces
70. Extrafine threaded connections are generally recommended for
Correct : D. thin walled assemblies
71. A square key is
Correct : A. Equally strong in shear and compression
72. A steel specified as St 50 will have a tensile strength of approximately
Correct : B. 50 kg/mm2
73. The chain used in motor cycles is generally
Correct : B. Silent type
74. In gear design, addendum is equal to
Correct : D. Module
75. Lubricant is not required in
Correct : B. Electromagnetic bearing
76. A connecting rod in an IC Engine is to be designed against buckling. The end conditions considered are
Correct : C. Both the ends are hinged
77. A ball bearing cannot be provided for
Correct : A. Big ends of connecting rods for I.C. engines
78. Which of the following drive has accurate speed ratio?
Correct : B. Timing belt drive
79. Under which condition a material ordinatily said to be ductile undergoes a fracture similar to that of a brittle material
Correct : D. All of the above
80. When minimum axial thrust is the criteria, the choice of gears would been
Correct : C. Herringbone gears
81. A compressed air cylinder carries approximately 70 kg/cm2 pressure at the time of delivery. The inside diameter is 25 cm. If the steel has a yield point of 2300 kg/sq cm and a safety factor of 2.5 the wall thickness should be
Correct : A. 10 mm
82. If during operation a boiler bursts, the matter should be reported to
Correct : D. Boiler inspector
83. The compression members tend to buckle in the direction of
Correct : D. Least radius of gyration
84. A concrete wall generally
Correct : B. Reflects sound
85. When the bolt is subjected to shock loading the resilience of the bolt should be considered in order to prevent breakege at
Correct : C. Threaded portion
86. Maximum efficiency expected in case of single mech supr gears is around
Correct : B. 98%
87. In a gas turbine rotor a radial stress of 300 kg/sq cm tensile and 500 kg/sq cm tangential stress have been found at a point. The maximum shear stress at this point would be
Correct : B. 250 kg/cm2
88. The life of ball bearings as listed in catalogue represents
Correct : B. 90% survival rate
89. Rinkine-Gordon formula for buckling load is adopted for columns having slenderness ratio between
Correct : D. 120 and 200
90. Jaw clutches
Correct : A. cause shock loads when engaging
91. A rack is a gear
Correct : D. With infinite number of teeth
92. Expansion joints are provided on pipes carrying
Correct : D. Steam
93. The advantage of needle roller bearing over ball bearing is
Correct : D. Large ratio of load capacity to size
94. A V-belt designated as C 120 will have
Correct : C. 120 inch as the length of belt
95. Dielectric strength of a material is
Correct : A. Capacity to withstand high voltage
96. According to IS 800, the lacing bars should resist a transverse shear equal to
Correct : B. 2.50%
97. The bunkers are the containers in which the plan of rupture intersects
Correct : E. the top surface of material stored
98. Laser treatment of components increases fatigue resistance of metals by
Correct : C. freezing discontinuities
99. Failure of rolling bearings occurs mainly due to
Correct : B. fatigue
100. In elevated circular steel tanks, conical bottoms are attached when