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Machine Design

Machine Design
The most important dimension in the design of a nut is

Inside diameter
Pitch diameter
Height
Outside diameter

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Machine Design
The railway carriage couplings have

Square threads
Knuckle threads
Buttress threads
Acme threads

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Machine Design
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

Remain unaffected with cross-section area
Would depend upon other factors
Increasing the cross-section area of bar
Decreasing the cross-section area of bar

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Machine Design
Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

Static loading
Completely reversed loading
Dynamic loading
Combined static and dynamic loading

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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

1.8 d
1.57 d
0.8 d
1.2 d

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Machine Design
The application of second type levers is found in

Handle of a hand pump
Hand wheel of a punching press
Lever of a loaded safety valve
A pair of tongs

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