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Machine Design

Machine Design
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

One-third
Double
One-half
One-fourth

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

45°
67.5°
22.5°
90°

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Machine Design
If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as

T/sec³φ
T sec²φ
T sec³φ
T cosecφ

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Machine Design
The design of the pressure vessel is based on

Hoop stress
Longitudinal stress
Longitudinal and hoop stress
None of these

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Machine Design
According to I.B.R., the factor of safety of riveted joint should not be less than

3
4
2
1

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Machine Design
In a journal bearing, the load on the bearing is __________ to the axis of the journal.

Both A and B
Parallel
Perpendicular
None of these

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