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Machine Design

Machine Design
The efficiency of a riveted joint is equal to

Least of Pt, Ps and Pc/P
Pc /P
Ps /P
Pt /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 tension
7.2 N/mm² tension
3.6 N/mm² compression

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Machine Design
When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the

Shank
Thread
Head
Middle

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Machine Design
For tight leakage joints, following type of thread is best suited

Square
Buttress
NPT (national pipe threads).
Metric

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

60°
75°
90°
45°

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Machine Design
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)

1.25 d
d
0.75 d
0.5 d

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