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Machine Design

Machine Design
The groove angle of the pulley for rope drive is usually

20°
60°
35°
45°

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Machine Design
For longitudinal joint in boilers, the type of joint used is

Butt joint with double cover plate
Lap joint with one ring overlapping the other
Butt joint with single cover plate
Any one of the above

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Machine Design
The temperature at which the new grains are formed in the metal is known as

Lower critical temperature
Recrystallization temperature
None of these
Upper critical temperature

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Machine Design
A screw is said to be a self locking screw, if its efficiency is

Less than 50%
None of these
Equal to 50%
More than 50%

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Machine Design
A hot short metal is

Brittle when cold
Brittle when hot
Brittle under all conditions
Ductile at high temperature

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Machine Design
The material commonly used for crane hooks is

Wrought iron
Cast iron
Mild steel
Aluminium

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