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Machine Design

Machine Design
In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.

Twice
None of these
Thrice
Half

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Machine Design
In V-belt drive, belt touches

At sides only
Could touch anywhere
At bottom
Both at bottom and sides

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Machine Design
A shaft coupling should

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

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Machine Design
The rolling contact bearings as compared to sliding contact bearings have

All of these
Accuracy of shaft alignment
Small overall dimensions
Low starting and low running friction except at very high speeds

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Machine Design
Gear box is used

To produce torque
For speed reduction
To obtain variable speeds
To increase efficiency of system

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Machine Design
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

Helix angle
None of these
Pressure angle
Pitch lead angle

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