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Machine Design

Machine Design
The rivet head used for boiler plate riveting is usually

Snap head
Pan Head
Conical head
Counter sunk head

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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

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

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Machine Design
Which of the following pipe joints would be suitable for pipes carrying steam?

Flanged
Expansion
Bell and spigot
Threaded

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (2a/b)]
σ [1 + (3a/b)]
σ [1 + (b/2a)]
σ [1 + (b/3a)]

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Machine Design
The acme threads are usually found on

Feed mechanism of machine tools
Railway carriage couplings
Spindles of bench vices
Screw cutting lathes

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Machine Design
Shaft coupling is used in machinery to

All of these
Introduce mechanical flexibility
Reduce the transmission of shock loads
Introduce protection against over loads

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