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Machine Design

Machine Design
The included angle in unified of American National threads is

29°
55°
60°
47°

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Machine Design
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

2100 N-m
2136 N-m
2050 N-m
2000 N-m

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Machine Design
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

Increases
Remains unchanged
None of these
Decreases

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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

2.8
3.5
3
2.5

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Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/6
d/2
d/4
d/8

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Machine Design
The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be

43929
43869
44045
44047

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