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Machine Design

Machine Design
The material commonly used for machine tool bodies is

Mild steel
Aluminium
Brass
Cast iron

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

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Machine Design
Resilience of a material is important, when it is subjected to

Fatigue
Shock loading
Combined loading
Thermal stresses

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Machine Design
The coefficient of friction between the belt and pulley depends upon the

Speed of belt
All of these
Material of belt and pulley
Slip of belt

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

2.8
3.0
2.5
3.5

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Machine Design
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be

0.97
0.96
0.99
0.98

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