Machine Design
The rolling contact bearings are known as

Thick lubricated bearings
Thin lubricated bearings
Plastic bearings
Antifriction bearings

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

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Machine Design
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by

None of these
Equating shearing resistance to the crushing resistance of the rivets
Equating tearing resistance of the plate to the shearing resistance of the rivets
Equating tearing resistance of the plate to the crushing resistance of the rivets

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Machine Design
The creep in the belt is due to

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

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