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Machine Design

Machine Design
The efficiency of a riveted joint is equal to

Pc /P
Pt /P
Ps /P
Least of Pt, Ps and Pc/P

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Machine Design
A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

7.2 N/mm² compression
3.6 N/mm² compression
3.6 N/mm² tension
7.2 N/mm² tension

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Machine Design
If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

Diameter of bolt
1.25 × diameter of bolt
0.75 × diameter of bolt
1.5 × diameter of bolt

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Machine Design
The helix angle for double helical gears may be made up to

90°
45°
75°
60°

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Machine Design
Guest's theory is used for

Elastic materials
Plastic materials
Ductile materials
Brittle materials

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

20°
45°
60°
35°

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