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Machine Design

Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/6
d/2
d/8
d/4

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Machine Design
Oil in journal bearing should be applied at the point where load is

Any one of the above
Maximum
Average
Nil or lightest

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

4 τ
2 τ
τ
τ/2

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Machine Design
A self locking screw has

Coefficient of friction is greater than tangent of load angle
Hole for inserting split pin
Fine threads
Course threads

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Machine Design
The bearings of medium series have capacity __________ over the light series.

40 to 50%
10 to 20%
20 to 30%
30 to 40%

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Machine Design
Basic hole is one

Whose lower as well as upper deviations are zero
Whose upper deviation is zero
Whose lower deviation is zero
Does not exist

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