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Machine Design

Machine Design
The groove angle of pulleys for V-belt is

340 to 360
More than 400
420 to 450
300 to 320

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Machine Design
The maximum efficiency of a square threaded screw is

(1 + sinφ)/ (1 - sinφ)
(1 + cosφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + cosφ)
(1 - sinφ)/ (1 + sinφ)

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Machine Design
In nitrated parts, the origins of the fatigue cracks will occur at

Within the core
Just below the surface
Surface
None of these

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Machine Design
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

None of these
Decreases
Increases
Remains unchanged

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Machine Design
Belt slip may occur due to

All of these
Loose belt
Driving pulley too small
Heavy load

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Machine Design
The included angle for the V-belt is usually

10°-20°
40°-60°
60°-80°
30°-40°

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