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Machine Design

Machine Design
Which one of the following is a positive drive?

Rope drive
Crossed flat belt drive
V-belt drive
Chain drive

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Machine Design
Fabric belts are used in industrial applications because

They can work at high temperature
They are cheap
None of these
They are unaffected by moisture and humidity

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Machine Design
The lower deviation is the algebraic difference between the

Maximum limit and the basic size
Actual size and the corresponding basic size
None of these
Minimum limit and the basic size

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Machine Design
The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to 6/(6 + v).

15 m/s
10 m/s
20 m/s
12.5 m/s

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Machine Design
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Maximum distortion energy theory
Maximum principal stress theory
Maximum strain energy theory
Maximum shear stress theory

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

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