Theory of Machines Mcqs

Q:

The power of a governor is equal to

A) (c²/1 + 2c )(m + M) h B) (2c²/1 + 2c )(m + M) h
C) (3c²/1 + 2c )(m + M) h D) (4c²/1 + 2c )(m + M) h
 
Answer & Explanation Answer: D) (4c²/1 + 2c )(m + M) h

Explanation: Not available for this question

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17
Q:

Isochronism in a governor is desirable when

A) the engine operates at low speeds B) the engine operates at high speeds
C) the engine operates at variable speeds D) one speed is desired under one load
 
Answer & Explanation Answer: D) one speed is desired under one load

Explanation: The isochronous governor is not of practical use because the sleeve will move to one of its extreme positions immediately the speed deviates from the isochronous speed.

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15
Q:

A hunting governor is

A) more stable B) less sensitive
C) more sensitive D) none of the mentioned
 
Answer & Explanation Answer: C) more sensitive

Explanation: Not available for this question

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16
Q:

A governor is said to be hunting, if the speed of the engine

A) remains constant at the mean speed B) is above the mean speed
C) is below the mean speed D) fluctuates continuously above and below the mean speed
 
Answer & Explanation Answer: D) fluctuates continuously above and below the mean speed

Explanation: A governor is said to be hunt if the speed of the engine fluctuates continuously above and below the mean speed. This is caused by a too sensitive governor which changes the fuel supply by a large amount when a small change in the speed of rotation takes place.

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16
Q:

In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be

A) more sensitive B) less sensitive
C) isochronous D) none of the mentioned
 
Answer & Explanation Answer: B) less sensitive

Explanation: Stiffness is directly proportional to sensitiveness. Therefore, it stifness is greater, the governor will be less sensitive.

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16
Q:

For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

A) governor A is more sensitive than governor B B) governor B is more sensitive than governor A
C) both governors A and B are equally sensitive D) none of the mentioned
 
Answer & Explanation Answer: A) governor A is more sensitive than governor B

Explanation: The greater the lift of the sleeve corresponding to a given fractional change in speed, the greater is the sensitiveness of the governor. It may also be stated in another way that for a given lift of the sleeve, the sensitiveness of the governor increases as the speed range decreases.

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15
Q:

Which of the following is a spring controlled governor?

A) Hartnell B) Hartung
C) Pickering D) all of the mentioned
 
Answer & Explanation Answer: D) all of the mentioned

Explanation: Not available for this question

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15
Q:

Which of the following governor is used to drive a gramophone ?

A) Watt governor B) Porter governor
C) Pickering governor D) Hartnell governor
 
Answer & Explanation Answer: C) Pickering governor

Explanation: A Pickering governor is mostly used for driving gramophone. It consists of three straight leaf springs arranged at equal angular intervals round the spindle. Each spring carries a weight at the centre. The weights move outwards and the springs bend as they rotate about the spindle axis with increasing speed.

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