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Machine Design

Machine Design
The cross-section of the arm of a bell crank lever is

Rectangular
I-section
Elliptical
Any one of these

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Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/6
d/4
d/8
d/2

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Machine Design
The fatigue life of a part can be improved by

Polishing
Coating
Electroplating
Shot peening

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Machine Design
According to Indian standards, total numbers of tolerance grades are

8
12
20
18

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Machine Design
The power transmitted by means of a belt depends upon

Tension under which the belt is placed on the pulleys
Arc of contact between the belt and the smaller pulley
Velocity of the belt
All of these

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Machine Design
The square threads are usually found on

Spindles of bench vices
Feed mechanism of machine tools
Railway carriage couplings
Screw cutting lathes

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MORE MCQ ON Machine Design

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