Mechanical Engineering - Theory of machines

1. 

Which of the following statement is correct?

A. The primary unbalanced force is less than the secondary unbalanced force.
B. The primary unbalanced force is maximum twice in one revolution of the crank.
C. The unbalanced force due to reciprocating masses varies in magnitude and direction both.
D. The magnitude of swaying couple in locomotives is inversely proportional to the distance between the two cylinder centre lines

Answer: Option B

Explanation:

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2. 

The magnitude of velocities of the points on a rigid link is

A. directly proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre
B. directly proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre
C. inversely proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre
D. inversely proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre

Answer: Option D

Explanation:

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3. 

A pendulum type governor is a Watt governor.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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4. 

In a single slider crank chain

A. each of the four pairs is a turning pair
B. one is a turning pair and three are sliding pairs
C. two are turning pairs and two are sliding pairs
D. three are turning pairs and one is a sliding pair

Answer: Option D

Explanation:

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5. 

The mechanism consisting of three turning pairs and one sliding pair, is called a

A. single slider crank chain
B. Whitworth quick return motion mechanism
C. crank and slotted lever quick return motion mechanism
D. all of the above

Answer: Option D

Explanation:

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