# Mechanical Engineering - Engineering Mechanics

### Exercise :: Engineering Mechanics - Section 5

1.

The forces, which meet at one point and their lines of action also lie on the same plane, are known as

 A. coplaner concurrent forces B. coplaner non-concurrent forces C. non-coplaner concurrent forces D. non-coplaner non-concurrent forces

Explanation:

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2.

The amount by which the outer edge of the rail is raised, is known as super-elevation.

 A. Agree B. Disagree

Explanation:

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3.

The unit of energy in S.I. units is

 A. dyne B. watt C. kg-m D. joule

Explanation:

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4.

The angle of inclination of the plane at which the body begins to move down the plane, is called

 A. angle of friction B. angle of repose C. angle of projection D. none of these

Explanation:

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5.

Which of the following statement is incorrect?

 A. A force acting in the opposite direction to the motion of the body is called force of friction. B. The ratio of the limiting friction to the normal reaction is called coefficient of friction. C. A machine whose efficiency is 100% is known as an ideal machine. D. The velocity ratio of a machine is the ratio of load lifted to the effort applied.