Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

Smaller than
Equal to
Larger than
None of these

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Machine Design
When the belt is transmitting maximum power,

The tension in tight side is thrice the centrifugal tension
None of these
The tension in tight side is twice the centrifugal tension
The tension in slack side is equal to the centrifugal tension

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