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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Nickel and chromium
Cobalt and molybdenum
Chromium
Nickel

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Machine Design
A screw will be self locking, if

Friction angle is equal to helix angle
Friction angle is more than helix angle
Efficiency of screw is 100%
Friction angle is less than helix angle

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Machine Design
A locking device extensively used in automobile industry is a

Castle nut
Jam nut
Sawn nut
Ring nut

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Machine Design
The taper on a rectangular sunk key is

1 in 32
1 in 16
1 in 48
1 in 100

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Machine Design
Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

p.d.σt
p.t.σt
(p - d) t.σt

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Machine Design
If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

0.2
0.6
0.5
0.25

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