Correct : B. Belts should touch the bottom of groove in pulley
2. According to the law of gearing
Correct : C. Common normal at the point of contact always passes through a fixed point (pitch point) on the line joining the centres of rotation
3. In a V-belt having B section may be used when the load to be transmitted is
Correct : B. 3 to 20 HP
4. A slider crank chain consists of
Correct : C. Three turning and one sliding pairs
5. In case of reciprocating engines the primary forces
Correct : C. Are partially balanced
6. Which one of the following is a transmission type dynamometer?
Correct : E. None of the above
7. In case of gears the addendum is given by
Correct : E. One module
8. The rectilinear motion of a piston is converted into rotary motion by
Correct : C. Connecting rod
9. In case of gears the pressure angle is
Correct : A. The angle between the line of action and the common tangent to the pitch surface in the plane of rotation
10. A swinging pendulum in its mid-position possesses
Correct : B. only the kinetic energy
11. When the two elements of a pair are kept in contact with the help of a spring, the pair is known as
Correct : D. an unclosed pair
12. Which one of the following is a higher pair?
Correct : A. Tooth gearing mechanism
13. The difference between a machine and a structure is
Correct : B. The machine serves to modify and transmit mechanical work whereas structures serve to modify and transmit forces only
14. In case of lower pairs
Correct : A. There is surface contact between the two elements while in the motion
15. A 0.5 kg weight attached to a light spring elongates it 0.6 mm. The natural frequency of the system should be approximately
Correct : E. 16 Hz
16. A piston and cylinder in a slider crank mechanism form a
Correct : D. Sliding pair
17. In case of reciprocating engine mechanism
Correct : D. The primary force has twoce the frequency of secondary force
18. At node of the shaft
Correct : D. The vibrations are zero
19. In a well greased ball bearing the coefficient of friction may be in the range
Correct : E. 0.1 to 0.25
20. A vibrating system with unity as damping factor will be
Correct : E. Critically damped
21. In case of spur gears the flank of the tooth is
Correct : B. The part of the tooth surface lying below the pitch surface
22. The number of links in a pantograph is equal to
Correct : B. 4
23. Module is expressed in
Correct : A. mm
24. In case of an elliptical trammel
Correct : E. Two pairs turn and two pairs slide
25. Creep in belts is due to
Correct : D. Differential elougation of belt due to difference in tension on two sides of a pulley
26. Which one of the following is the inversion of slider crank mechanism
Correct : E. (A), (B) and (C) above
27. The radial depth of a ger tooth below the pitch circle is
Correct : E. Dedendum
28. The pitch point on a cam is
Correct : B. The point on cam pitch circle having the maximum pressure angle
29. While evaluating the minimum number of teeth on a opinion the major consideration is
Correct : C. To avoid interference
30. Gears of watches are generally manufactured by
Correct : A. Stamping
31. The effect of creep in case of cross belt drive is
Correct : C. to reduce the speed of driven pulley
32. Isochronism in a governor is desirable when
Correct : D. One speed is desired to be kept for all loads
33. In case of locomotives, the swaying couple is resisted by
Correct : E. (C) and (D) together
34. A gear cutter suitable for cutting 42 to 54 teeth will provide correct form
Correct : A. For any gear having teeth anywhere between 42 to 54
35. Sensitiveness of a governor is
Correct : D. The ratio of the difference between the maximum and minimum equilibrium speed to the mean equilibrium speed
36. A kinematic chain becomes a mechanism when
Correct : A. Any one link is fixed
37. Module for gear is expressed in terms of
Correct : C. Millimeters
38. Which is incorrect statement, if any
Correct : E. None of the above
39. In the cam mechanism, a mushroom follower is
Correct : B. One provided with a flat face with a perfect flat plane
40. In a slider-crank mechanism
Correct : A. there are 4 turning pairs
41. A nut and bolt form a
Correct : A. Helical pair
42. In case of meter gauge locomotives the distance between wheel centres is
Correct : B. 1 metre
43. Crowning is done on
Correct : C. Pulleys
44. In case of gears the tooth fillet is
Correct : B. Radius that connects the root circle to the profile of the tooth
45. The sense of tangential acceleration of a link
Correct : C. Could be either the same or opposite to velocity
46. A beater machine in a pulp mill is driven by a 50 H.P. motor using 6 vee belts of D section. If one of the belt breaks after a month
Correct : A. All the belts have to be replaced
47. A pantograph is a mechanism or a kinematic arrangement comprising
Correct : B. Two lower pairs
48. Which one of the following is lightest?
Correct : E. 1 US short ton
49. The angle of a V-belt is
Correct : D. 40?
50. A pantograph is a mechanism with
Correct : D. Lower pairs
51. In case of higher pairs
Correct : B. There is only line or point contact between the two elements while in motion
52. When one of the links of a kinematic chain is fixed it is known as
Correct : B. mechanism
53. Tan ? can be greater than
Correct : E. Tan ? can never be greater than
54. For a vibrating body, if ratio ?/?n is very high, then phase angle would tend to approach
Correct : C. 180?
55. Dynamically unbalanced masses in rotating machines cause
Correct : D. Vibrations
56. Which of the following are not standard forms for spur-gears?
Correct : A. All above
57. A stretched string of a guitar when operated is subjected to
Correct : C. Forced transverse vibrations
58. A vibrometer
Correct : C. Indicates vibration amplitude
59. For fluctuating loads, the appropriate bearing would be
Correct : E. Needle roller bearing
60. In case of belt drives, the effect of centrifugal tension is
Correct : A. To reduce the driving power
61. In case of instantaneous centre of rotation
Correct : D. The two rigid links have no linear velocities relative to each other at the instantaneous centre
62. 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 pitch point
63. The standard pressure angle is generally
Correct : D. 14
64. Frequency of oscillation of a compound pendulum having the same distance between point of suspension and the centre of gravity of mass as a simple pendulum will be
Correct : A. Less
65. Which is the false statement about a governor?
Correct : C. A sensitive governor cannot be isochronous
66. The angle of obliquity is kept small in order
Correct : D. To avoid larger throusts
67. If there are L number of links in a mechanism, then the number of possible inversions would be
Correct : D. L
68. A mechanism is an assembly of
Correct : D. four or more than four links
69. A gear box in an automobile utilises
Correct : B. Compound gear train
70. In the coupling rod mechanism of a locomotive each of the four pairs is a
Correct : D. Turning pair
71. At critical speed
Correct : C. The shaft becomes dynamically unstable with negligible lateral amplitudes
72. When sunk key is to be used the key way is
Correct : C. Provided both in shaft and hub
73. Kinetic friction is
Correct : B. Less than maximum static friction
74. Coriolis component of acceleration will exist only if
Correct : C. Two coincidental points have linear relative velocity of sliding accompanied by the rotation about fixed centres
75. In a car, transmission losses will be minimum in
Correct : B. Direct gear
76. Cam size depends upon
Correct : C. Base circle
77. In a car transmission losses will be least in which gear?
Correct : A. Direct gear
78. Klein's construction is used to determine
Correct : C. Acceleration of various parts
79. A sphere of mass 100 kg moving at 10 m/s overtakes and collides with another sphere of mass 50 kg moving at 3 m/s in the same direction. If the impact is perfectly elastic, the velocity of two masses after impact will be
Correct : A. 6.67 m/s
80. Which of the following road offers maximum resistance to automobiles?
Correct : A. Loose sand
81. The mechanism used to enlarge or reduce moments for reproducing drawings to different scales is known as
Correct : C. Pantograph
82. The frictional torque transmitted by a cone clutch is the same as that of
Correct : C. truncated conical pivot bearing
83. Froude's dynamometer is
Correct : C. Vortex type hydraulic dynamometer
84. In vibration analysis 'Beat' frequency is
Correct : B. Said to occur when two vibrations of almost equal frequency are present
85. In case of Scotch Yoke Mechanism the Coriolis component is
Correct : B. Not involved
86. A 0.5 kg weight attached to a light spring elongates it 0.981 mm. The natural frequency of the system would be approximately
Correct : D. 16 cps
87. A vibrating system is said to be stable if
Correct : A. The amplitude of vibration decreases with time
88. The cam angle is
Correct : A. The angle of rotation of the cam for a definite displacement of the follower
89. The coefficient of friction between pulley and belt is reduced to half. If the initial ratio of tension in belt is 5, then the new value will be
Correct : E. None of the above
90. In a system if the speed reduction of 60 : 1 is desired the convenient way is to use
Correct : B. Worm and worm wheel
91. Which of following gear system have minimum axial thrust?
Correct : E. Miter gears
92. In Iocomotives, swaying couple is caused due to
Correct : D. Unbalanced parts of the primary forces acting at a distance between the line of stroke of the cylinders
93. A governor is said to be isochronous when
Correct : D. There is only one equibilbrium speed which is constant for all radii of rotation of the bells within the working range
94. In a Hartnell governor if the stiffness of spring is increased the governor will
Correct : B. Become less sensitive
95. In taper roller bearing the contact angle is
Correct : D. Between 5? and 10?
96. Which of the following is a sliding pair?
Correct : D. Cross-head and guides
97. A body having an initial velocity of 10 m/s moves 200 mm in 5 sec when a force of 20 kgf is applied to it. If the acceleration due to gravity is 9 m/s2 the weight of the body should be
Correct : A. 15 kg
98. Which of the following is not a common section of V-belts
Correct : B. F
99. The speed of gas turbine is usually
Correct : C. Well above the natural frequency of vibrations
100. The direction of Corioli's component of acceleration is
Correct : A. The direction of relative velocity vector for the two coincidental points rotated by 90? in the direction of the angular velocity of the rotation of the link