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Machine Design

Machine Design
The helix angle for double helical gears may be made up to

60°
90°
75°
45°

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Machine Design
The gears are termed as medium velocity gears, if their peripheral velocity is

15-30 m/s
3-15 m/s
1-3 m/s
30-50 m/s

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Machine Design
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

3W/A
W/2A
2W/A
W/A

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Machine Design
The width of the pulley should be __________ width of the belt.

None of these
Equal to
Less than
Greater than

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Machine Design
A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

3.6 N/mm² tension
7.2 N/mm² compression
3.6 N/mm² compression
7.2 N/mm² tension

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Machine Design
Lewis equation is applied

To stronger of the pinion or gear
Only to the pinion
To weaker of the pinion or gear
Only to the gear

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