# Mechanical Engineering - Machine Design

### Exercise :: Machine Design - Section 1

21.

The velocity of sliding __________ the distance of the point of contact from the pitch point.

 A. is directly proportional to B. is inversely proportional to C. is equal to cos φ multiplied by D. does not depend upon

Explanation:

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22.

A column is known as a long column if the slenderness ratio is

 A. 40 B. 50 C. 70 D. 100

Explanation:

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23.

Circumferential joint in boilers is used to get the required length of a boiler.

 A. True B. False

Explanation:

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24.

The ball bearings are provided with a cage

 A. to reduce friction B. to facilitate slipping of balls C. to prevent the lubricant from flowing out D. to maintain the balls at a fixed distance apart

Explanation:

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25.

When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be