15) While drilling in lathe, the drill is held in the

Headstock

Tailstock

Compound rest

Bed

Answer is:

Tailstock

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.

Increase the speed and feed

Reduce the speed and feed

Increase the speed and reduce the feed

Increase the feed and reduce the speed

Answer is:

To support the workpiece always

To turn long workpiece

Because it is easy to lubricate the workpiece

To face the workpiece up to the end of the centre hole

Answer is:

Explanation:

A lathe half centre is used to face the workpiece up to the end of the centre hole.