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Machine Design

Machine Design
Which of the following has threads at both ends?

Bolt
Tap bolt
Stud
None of these

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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
0.8 times
0.4 times
0.6 times

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Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Decreasing the modulus of elasticity of the bar
Increasing the length of bar
All of these
Decreasing the cross-sectional area of the bar

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Machine Design
When the belt is transmitting maximum power, the belt speed should be (Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

√(3m /Pmax)
√(Pmax / 3m)
√(Pmax / m)
√(Pmax / 2m)

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Machine Design
Deep groove ball bearings are used for

Heavy thrust load only
Small angular displacement of shafts
Radial load at high speed
Combined thrust and radial loads at high speed

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Machine Design
Rivets are generally specified by

Length of rivet
Thickness of plates to be riveted
Nominal diameter
Diameter of head

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