Machine Design
The bending moment ‘M’ and a torque ‘T’ is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then ‘M’ is equal to

4 T
2 T
T/2
1 T

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Machine Design
The angle of twist of shaft is

Inversely proportional to (shaft diameter)⁴
Directly proportional to (shaft diameter)²
Directly proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)²

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Machine Design
Coaxing is the procedure of increasing

Metal strength by cycling
Metal hardness by surface treatment
Fatigue limit by over-stressing the metal by successively increasing loadings
Metal resistance to corrosion by coating

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Machine Design
When the speed of belt increases,

The coefficient of friction between the belt and pulley increases
The power transmitted will increase
The power transmitted will decrease
The coefficient of friction between the belt and pulley decreases

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