Mechanical Engineering - Theory of machines

1. 

The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

A. vertically and parallel
B. vertically and perpendicular
C. horizontally and parallel
D. horizontally and perpendicular

Answer: Option D

Explanation:

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2. 

The contact ratio is given by

A.
B.
C.
D.

Answer: Option C

Explanation:

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3. 

At the node, the shaft remains unaffected by the vibration.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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4. 

The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω1 rad/s in the clockwise direction and the link OB turns with angular velocity ω2 rad/s in the anti-clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

A. ω12.r
B. ( ω1 - ω2)r
C. ( ω1 + ω2)r
D. ( ω1 - ω2)2r

Answer: Option C

Explanation:

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5. 

When the two elements of a pair have __________ when in motion, it is said to a lower pair.

A. line or point contact
B. surface contact

Answer: Option B

Explanation:

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