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Machine Design

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

(p - d) t.σt
(p - d) σt
p.d.σt
p.t.σt

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

Jam nut
Sawn nut
Castle nut
Ring nut

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

Half
Thrice
None of these
Twice

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

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Machine Design
In Vickers hardness testing, the pyramid indentor apex is

136°
152°
122°
40°

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Machine Design
A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)

Less than 20d
Greater than 30d
Equal to inside diameter of pipe
Between 20d and 30d

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