Machine Design
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

Axially upwards
Axially upwards or downwards
None of these
Axially downwards

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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 five rivets per pitch length, all in double shear
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

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Machine Design
Form coefficient of spring is

Its capability of storing energy
Concerned with strength of wire of spring
Load required to produce unit deflection
Ratio of coil diameter to wire diameter

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