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Machine Design

Machine Design
If a spring is cut down into two springs, the stiffness of cut springs will be

Half
Same
None of these
Double

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Machine Design
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as

Gib-head key
Wood ruff key
Feather key
Flat saddle key

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

45° - φ
45° - φ/2
90° - φ
45° + φ/2

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Machine Design
The bending stress in a curved beam is

Zero at the point other than centroidal axis
Maximum at the neutral axis
Zero at the centroidal axis
None of these

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Machine Design
The strength of the unriveted plate (P) per pitch length is equal to

(p - d) σt
p.t.σt
p.d.σt
(p - d) t.σt

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Machine Design
Wire ropes as compared to cotton ropes

Can withstand shock loads
Are lighter in weight
Offer silent operation
All of these

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