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Machine Design

Machine Design
The static tooth load should be __________ the dynamic load.

Less than
Greater than
None of these
Equal to

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Machine Design
The tension on the slack side of the belt is __________ the tension on the tight side of the belt.

Less than
Equal to
None of these
Greater than

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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

τ/2
4 τ
τ
2 τ

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Machine Design
According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

d = 1.6√t
d = √t
d = 2√t
d = 6√t

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Machine Design
The rolling contact bearings are known as

Plastic bearings
Thin lubricated bearings
Antifriction bearings
Thick lubricated bearings

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Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

63 to 70%
80 to 90%
45 to 60%
70 to 83%

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