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Machine Design

Machine Design
If a material fails below its yield point, failure would be due to

Fatigue
Straining
Creep
Sudden loading

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Machine Design
The maximum efficiency of a square threaded screw is

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

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Machine Design
A single strap butt joint is always in __________ shear.

Double
Single
Triple share
None of these

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

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

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Machine Design
When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the

Head
Shank
Thread
Middle

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Machine Design
The notch angle of the Izod impact test specimen is

45°
10°
30°
20°

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