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Machine Design

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

One-third
One-half
Double
One-fourth

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Machine Design
A screw is said to be a self locking screw, if its efficiency is

Equal to 50%
Less than 50%
More than 50%
None of these

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Machine Design
All stresses produced in a belt are

Shear stresses
Tensile stresses
Compressive stresses
Both tensile and compressive stresses

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Machine Design
In a marine flange coupling, the pitch circle diameter of bolts is taken as

2.5 d
2 d
1.6 d
1.2 d

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Machine Design
The property of a bearing material which has the ability to accommodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as

Fatigue strength
Bondability
Comformability
Embeddability

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Machine Design
A shaft coupling should

Be easy to connect or disconnect
Transmit full power of the shaft
Hold the shafts in perfect alignment
All of these

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