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Machine Design

Machine Design
The wear load should be __________ the dynamic load.

Equal to
Less than
Greater than
None of these

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Machine Design
For crank shaft bearings, the ratio of the length of the journal to its diameter is_________.

Greater than unity
None of these
Less than unity
Equal to 1

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Machine Design
For maximum power, the velocity of the belt will be

√(T/3m)
√(T/2m)
None of these
√(T/m)

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Machine Design
Wahl's stress factor __________ very rapidly as the spring index decreases.

None of these
Increases
Decreases
Remain same

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Machine Design
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

1680 d
2840 d
1420 d
2080 d

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Machine Design
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

0.7 times
0.6 times
0.4 times
0.8 times

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