A screw will be self locking, if

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

A

Less than 50%

B

More than 50%

C

Equal to 50%

D

None of these

A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

A

Ring nut

B

Castle nut

C

Sawn nut

D

Jam nut

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

A

Larger than

B

Smaller than

C

Equal to

D

None of these

A self locking screw has

A

Fine threads

B

Course threads

C

Coefficient of friction is greater than tangent of load angle

D

Hole for inserting split pin

While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

A

both ends fixed

B

both ends hinged

C

one end fixed and other end hinged

D

one end fixed and other end free.

For a self locking machine, the efficiency must be

A

Equal to 50%

B

Less than 50%

C

Greater than 50%

D

100%

For a self-locking machine, the efficiency should be

A

Less than 60%

B

50%

C

More than 50%

D

None of these

A screw is said to be over hauling screw, if its efficiency is

A

less than 50%

B

more than 50%

C

equal to 50%

D

none of the mentioned

When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

A

Knuckle threads

B

Square threads

C

Acme threads

D

Buttress threads

When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

A

Axially upwards

B

Axially downwards

C

Axially upwards or downwards

D

None of these

A screw will be self locking, if

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