Civil Engineering - Applied Mechanics

31. 

If three rigid rods are hinged together to form a triangle and are given rotary as well as translatory motion, the number of instantaneous centres of the triangle, will be

A. 1
B. 2
C. 3
D. 4
E. 5.

Answer: Option C

Explanation:

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32. 

The mechanical advantage of an ideal machine is 100. For moving the local through 2 m, the effort moves through

A. 0.02 m
B. 2 m
C. 2.5 m
D. 20 m.

Answer: Option A

Explanation:

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33. 

When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known as

A. imaginary work
B. negative work
C. virtual work
D. none of these.

Answer: Option C

Explanation:

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34. 

The resultant of two forces P and Q acting at an angle θ, is

A. P2 + Q2 + 2P sin θ
B. P2 + Q2 + 2PQ cos θ
C. P2 + Q2 + 2PQ tan θ
D.
E.

Answer: Option D

Explanation:

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35. 

To attain the synchronous orbit, the launch of a satellite, is done from a place

A. on equator
B. on 30° latitude
C. on 45° latitude
D. on 60° latitude
E. on the poles.

Answer: Option A

Explanation:

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