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To ensure self-locking in a screw jack, it is essential that helix angle...

Q.  
To ensure self-locking in a screw jack, it is essential that helix angle is


Answer & Explanation

The angle of friction should always be more than the helix angle of the screw.

Thus correct option is: B.

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The maximum efficiency of a self-locking screw is

A. 50%

B. 70%

C. 75%

D. 80%


Answer & Explanation

Q.  
In a collar thrust bearing, the number of collars have been doubled, while maintaining to coefficient of friction and axial thrust same. This will result in

A. Same frictional torque and same bearing pressure

B. Double frictional torque and half bearing pressure

C. Double frictional torque and same bearing pressure

D. Same frictional torque and half bearing pressure


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In the multiple disc clutch, if there are 6 discs on the driving shaft and 5 discs on the driven shaft, then the number of pairs of contact surfaces will be equal to

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Flywheel absorbs energy during those periods of crank rotation when

A. The twisting moment is greater than the resisting moment

B. The twisting moment is equal to the resisting moment

C. The twisting moment is less than the resisting moment

D. The load on the engine falls


Answer & Explanation
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