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Machine Design

Machine Design
In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.

Twice
None of these
Thrice
Half

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Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Increasing the length of bar
Decreasing the cross-sectional area of the bar
Decreasing the modulus of elasticity of the bar
All of these

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Machine Design
In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)

3.5 d
2d + 20 mm
2d + 13 mm
d + 17 mm

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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
In block brakes, the ratio of shoe width to wheel diameter is taken between

0.50 and 0.75
0.1 and 0.25
0.75 and 1
0.25 and 0.50

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Machine Design
In nitrated parts, the origins of the fatigue cracks will occur at

None of these
Surface
Just below the surface
Within the core

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