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Machine Design

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

One-half
Double
One-fourth
One-third

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Machine Design
Three different weights fall from a certain height under vacuum. They will take

None of these
Times proportional to weight to reach earth
Same time to reach earth
Times inversely proportional to weight to reach earth

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Machine Design
Buttress threads are usually found on

Railway carriage couplings
Spindles of bench vices
Screw cutting lathes
Feed mechanisms

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Machine Design
The value of stress concentration factor depends upon

None of these
Material and geometry of the part
Material of the part
Geometry of the part

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Machine Design
A coupling used to connect two perfectly aligned shafts, is

All of these
Compression coupling
Muff coupling
Flange coupling

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Machine Design
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

None of these
Axially downwards
Axially upwards or downwards
Axially upwards

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