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Machine Design

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

152°
40°
136°
122°

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Machine Design
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

1.2 d
1.57 d
0.8 d
1.8 d

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Machine Design
The stretching in a belt can be controlled by __________ the stress in the belt.

Reducing
Both A and B
Increasing
None of these

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Machine Design
The diameter of the rivet hole is usually __________ the nominal diameter of the rivet.

Less than
None of these
More than
Equal to

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Machine Design
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

None of these
Axially downwards
Axially upwards
Axially upwards or downwards

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Machine Design
The maximum efficiency of a square threaded screw is

(1 - sinφ)/ (1 + sinφ)
(1 + sinφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + cosφ)
(1 + cosφ)/ (1 - sinφ)

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