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Machine Design

Machine Design
For maximum power, the velocity of the belt will be

None of these
√(T/m)
√(T/2m)
√(T/3m)

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Machine Design
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

Shaft A is better than shaft B
None of these
Both the shafts are equally good
Shaft B is better than shaft A

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Machine Design
When the belt is transmitting maximum power, the belt speed should be (Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

√(Pmax / m)
√(3m /Pmax)
√(Pmax / 3m)
√(Pmax / 2m)

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Machine Design
Buttress threads are usually found on

Feed mechanisms
Screw cutting lathes
Spindles of bench vices
Railway carriage couplings

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Machine Design
A screw is said to be over hauling screw, if the

Efficiency of screw is 100%
Friction angle is more than helix angle
Friction angle is equal to helix angle
Friction angle is less than helix angle

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Machine Design
The rolling contact bearings as compared to sliding contact bearings have

Accuracy of shaft alignment
Low starting and low running friction except at very high speeds
Small overall dimensions
All of these

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