124) Centre used for holding hollow jobs on a lathe is

Half centre

Pipe centre

Square centre

Revolving centre

Answer is:

Pipe centre

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125) Knurling is an operation of

Cutting smooth collars

Under cutting

Roughing the surface for hand grip

Enlarging hole size

Answer is:

Roughing the surface for hand grip

126) Operation of bevelling the extreme end of a work piece, is known as

Chamfering

Grooving

Counter sinking

Counter boring

Answer is:

Chamfering

Explanation:

Chamfering: Chamfering is the operation of beveling the extreme end of the work piece. The form tool used for taper turning may be used for this purpose. Chamfering is an essential operation after thread cutting so that the nut may pass freely on the threaded work piece.