Engineering :: Theory of Machines
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51. |
The type of governor used in record players for adjusting the speed of turn table generally is |
A. |
Hartung governor |
B. |
Pickering governor |
C. |
Proell governor |
D. |
Porter governor |
E. |
Simple Watt's governor |
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Answer: Option B
Explanation:
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52. |
Idler pulley is used for |
A. |
Maintaining belt tension |
B. |
Changing direction of rotation |
C. |
For stopping motion frequently |
D. |
For running during idling periods only |
E. |
None of the above |
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Answer: Option A
Explanation:
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53. |
By using large thread angles in a lifting machine |
A. |
The mechanical advantage will be high |
B. |
The load will be sustained in absence of effort |
C. |
The mechanical advantage will be low |
D. |
The load will be easily lifted |
E. |
While unloading, little effort will be required |
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Answer: Option C
Explanation:
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54. |
Which is incorrect statement, if any |
A. |
The force of friction is independent of the velocity of sliding |
B. |
The force of friction is independent of the extent of the surfaces in contact |
C. |
The force of friction is directly proportional to the pressure between the surfaces in contact |
D. |
The laws of friction are true when the intensity of the pressure between the surfaces is small |
E. |
None of the above |
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Answer: Option E
Explanation:
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55. |
In a well greased ball bearing the coefficient of friction may be in the range |
A. |
0.1 to 0.25 |
B. |
0.25 to 0.45 |
C. |
0.45 to 0.60 |
D. |
0.60 to 0.70 |
E. |
0.70 to 0.80 |
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Answer: Option A
Explanation:
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56. |
The maximum efficiency of a screw jack provided with square threads and angle of friction 30? will be |
Answer: Option B
Explanation:
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57. |
The purpose of providing multiple collars on a flat collar pivot bearing is to |
A. |
Increase frictional resistance |
B. |
To establish self-sustaining bearing condition |
C. |
Distribute the frictional load because of limiting friction |
D. |
Distribute the axial load because of limiting bearing pressure on a collar |
E. |
None of the above |
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Answer: Option D
Explanation:
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58. |
A belt drive is |
A. |
A positive drive |
B. |
Not a positive drive |
C. |
Meant for small torque transmission only |
D. |
Used only when the two pulleys have parallel axis |
E. |
None of the above |
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Answer: Option B
Explanation:
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59. |
Slip in belt drive is |
A. |
Loss of power |
B. |
Difference between the velocities of two pulleys |
C. |
Difference between the angular velocities of two pulleys |
D. |
Difference between the linear speed of the rim of pulley and the belt on it |
E. |
None of the above |
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Answer: Option D
Explanation:
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60. |
In case of flat belt drive the length of belt in case of |
A. |
Open belt depends on sum of the diameters of pulleys |
B. |
Open belts depends on difference of the diameters of pulleys |
C. |
Cross belts depends on the sum of the diameters of pulleys |
D. |
Cross belts depends on the difference of the diameters of pulleys |
E. |
None of the above |
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Answer: Option C
Explanation:
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