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Machine Design

Machine Design
The difference between the upper limit and lower limit of a dimension is called

Tolerance
Basic size
Nominal size
Actual size

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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

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

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Machine Design
A screw is said to be a self locking screw, if its efficiency is

Less than 50%
None of these
More than 50%
Equal to 50%

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Machine Design
Lewis equation in gears is used to find the

Tensile stress in bending
Shear stress
Compressive stress in bending
Fatigue stress

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Machine Design
The yield point in static loading is __________ as compared to fatigue loading.

Higher
Lower
None of these
Same

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

3
3.5
2.8
2.5

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