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Machine Design

Machine Design
The railway carriage couplings have

Acme threads
Square threads
Buttress threads
Knuckle threads

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Machine Design
The objective of 'crowning' of the flat pulleys of belt drive is to

Prevent the belt joint from damaging the belt surface
Increase the power transmission capacity
Prevent the belt from running off the pulley
Increase the belt velocity

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Machine Design
A shaft coupling should

Hold the shafts in perfect alignment
Be easy to connect or disconnect
Transmit full power of the shaft
All of these

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Machine Design
Shaft coupling is used in machinery to

All of these
Reduce the transmission of shock loads
Introduce protection against over loads
Introduce mechanical flexibility

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Machine Design
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be

3 times more
2 times more
Same in both cases
4 times more

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Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Hot working
Shot peening
Grinding and lapping surface
Cold working

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