# Mechanical Engineering - Theory of machines

### Exercise :: Theory of machines - Section 1

41.

The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

 A. pitch circle B. base circle C. pitch curve D. prime circle

Explanation:

No answer description available for this question. Let us discuss.

42.

A pair of friction discs is an example of rolling pair.

 A. True B. False

Explanation:

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43.

In order to balance the reciprocating masses,

 A. primary forces and couples must be balanced B. secondary forces and couples must be balanced C. both (a) and (b) D. none of these

Explanation:

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44.

In a screw jack, the effort required to lower the load W is given by

 A. P = W tan(α - φ) B. P = W tan(α + φ) C. P = W tan(φ - α) D. P = W cos(α + φ)

Explanation:

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45.

An automobile steering gear is an example of

 A. sliding pair B. rolling pair C. lower pair D. higher pair