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Machine Design

Machine Design
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

W/A
3W/A
W/2A
2W/A

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Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

5 d
3 d
2 d
4 d

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

90° - φ
45° - φ
45° - φ/2
45° + φ/2

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

Increases
Remain same
Decreases
None 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

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

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Machine Design
A sliding bearing which operates without any lubricant present, is called

Hydrostatic lubricated bearing
Boundary lubricated bearing
Hydrodynamic lubricated bearing
Zero film bearing

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