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Machine Design

Machine Design
In a full journal bearing, the angle of contact of the bearing with the journal is

120°
270°
180°
360°

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Machine Design
Which is positive drive?

V belt drive
Timing belt
Flat belt drive
Crossed belt drive

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Machine Design
The resultant axial load on a bolt depends upon

Initial tension due to tightening of the bolt
Relative elastic yielding of the bolt and the connected members
External load applied
All of these

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Machine Design
A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is

3 kN-m
4 kN-m
1 kN-m
2 kN-m

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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

2 τ
τ
4 τ
τ/2

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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

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

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