Mechanical Engineering - Engineering Mechanics

1. 

Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

A. area of the triangle
B. twice the area of the triangle
C. half the area of the triangle
D. none of these

Answer: Option B

Explanation:

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2. 

If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

A. g/2
B. g/3
C. g/4
D. none of these

Answer: Option D

Explanation:

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3. 

Efficiency of a screw jack is given by(where α = Helix angle, and φ = Angle of friction.)

A.
B.
C.
D.

Answer: Option B

Explanation:

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4. 

When a train is rounding a curve, the side thrust on the wheel flanges is prevented by raising the outer edge of the rail.

A. Yes
B. No

Answer: Option A

Explanation:

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5. 

Frequency of vibrations means the number of cycles per second.

A. Yes
B. No

Answer: Option A

Explanation:

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