13) Which one of the following centres is suitable when workpiece held between centres is to be turned at high speed ?

Ball centre

Half centre

Pipe centre

Revolving centre

Answer is:

Revolving centre

Explanation:

Revolving centre is suitable when work-peice is to be turned at high speed.

30 Degree

45 Degree

60 Degree

90 Degree

Answer is:

Headstock

Tailstock

Compound rest

Bed

Answer is:

Explanation:

While drilling in lathe, the drill is held in the Tailstock

High speed steel

Tool steel

Tungsten carbide

High carbon steel

Answer is:

Reduce the speed of spindle

Increase the speed of spindle

Reverse the speed of spindle

Transmit power from spindle gear to stud gear

Answer is:

Explanation:

Back-gear mechanism is provided in cone pulley headstock to reduce the speed of spindle.