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Machine Design

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

90°
67.5°
22.5°
45°

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Machine Design
The contact ratio for gears is

Zero
Less than one
Greater than one
None of these

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Machine Design
A shaft coupling should

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

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Machine Design
Which process will increase the fatigue duration of parts?

Finishing and polishing
Electroplating
De-carburisation
Shot-peening

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Machine Design
In radial bearings, the load acts __________ to the axis of rotation.

Parallel
Both A and B
None of these
Perpendicular

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Machine Design
The shock resistance of steel is increased by adding

Nickel
Chromium
Nickel and chromium
Cobalt and molybdenum

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