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Machine Design

Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

45°
90°
67.5°
22.5°

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Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Shot peening
Grinding and lapping surface
Hot working
Cold working

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Machine Design
The constant factor in case of R10 series of preferred numbers is

1.26
1.58
1.06
1.12

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Machine Design
In cyclic loading, stress concentration is more serious in

Ductile materials
Brittle materials
Elastic materials
Brittle as well as ductile materials

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Machine Design
The design of the pressure vessel is based on

Longitudinal stress
None of these
Longitudinal and hoop stress
Hoop stress

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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 / 2m)
√(Pmax / m)

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