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Machine Design

Machine Design
The difference between the upper limit and lower limit of a dimension is called

Nominal size
Actual size
Tolerance
Basic size

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Machine Design
In standard taper roller bearings, the angle of taper of outer raceway is

25°
5°
8°
15°

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Machine Design
In order to withstand resistance to wear, the best profile of gear is

14½° full depth involute tooth
20° full depth involute tooth
14½° stub tooth
20° involute stub tooth

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Machine Design
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

Z/pN
N/Zp
p/ZN
ZN/p

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Machine Design
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

2μ sinθ/(θ + sinθ)
4μ sinθ/(2θ + sin 2θ)
μ sinθ/(2θ + sin 2θ)
4μ sinθ/(θ + sinθ)

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Machine Design
The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.

Decreases
Remain same
Increases
None of these

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