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Machine Design

Machine Design
If two springs are in parallel then their overall stiffness will be

Half
None of these
Double
Same

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Machine Design
In a full journal bearing, the angle of contact of the bearing with the journal is

120°
360°
270°
180°

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

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Machine Design
A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

Ring nut
Jam nut
Castle nut
Sawn nut

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Machine Design
The strength of a riveted joint is equal to

Crushing strength of rivet (Pc)
Shearing strength of rivet (Ps)
Least value of Pt Ps and Pc
Tearing strength of plate (Pt)

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Machine Design
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

Decreases
None of these
Remains unchanged
Increases

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