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Machine Design

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

Reducing
Increasing
None of these
Both A and B

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Machine Design
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

Remains unchanged
Increases
None of these
Decreases

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Machine Design
The included angle for the British Association thread is

29°
47.3°
60°
55°

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Machine Design
The rated life of a bearing varies

Directly as load
Inversely as fourth power of load
Inversely as square of load
Inversely as cube of load

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Machine Design
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to

pd/σt
pd/3σt
pd/4σt
pd/2σt

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Machine Design
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)

None of these
0.124 - (0.684/T)
0.175 - (0.841/T)
0.154 - (0.912/T)

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