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Machine Design

Machine Design
In Vickers hardness testing, the pyramid indentor apex is

136°
122°
152°
40°

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Machine Design
The objective of idler pulley in belt drive is to

Increase the wrap angle and belt tension
Decrease the tendency of belt to slip
All the above objectives
Increase the power transmission capacity

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

2 τ
4 τ
τ/2
τ

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Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

4F/ πd²
16F/ 3πd²
6F/ πd²
8F/ πd²

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Machine Design
The acme threads are usually found on

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

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Machine Design
The bearings of medium series have capacity __________ over the light series.

30 to 40%
40 to 50%
10 to 20%
20 to 30%

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