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

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

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Machine Design
A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct?

There are four rivets per pitch length, out of which two are in single shear and two are in double shear
There are four rivets per pitch length, all in double shear
There are five rivets per pitch length, all in double shear
There are five rivets per pitch length, out of which four are in double shear and one is in single shear

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Machine Design
The creep in the belt is due to

Effect of temperature on belt
Unequal extensions in the belt due to tight and slack side tensions
Material of belt
Stresses beyond elastic limit of belt material

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