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571.

Swab is

A.	A welding defect	B.	A gear cutter
C.	A tool used in foundry	D.	A forging die
E.	A rocess of manufacturing grinding wheels

572.

Sweep patterns are used for

573.

The machine allowance on castings does depend on

A.	Size of the casting	B.	Shape of the casting
C.	Temperature of molten material	D.	All of the above
E.	None of the above

574.

While drilling on marble, the point angle should be

575.

High helix drills are used for deep hole drilling in

576.

A good cutting action is indicated by

A.	High cutting ratio	B.	Low cutting ratio
C.	Low chip reduction coefficient	D.	None of the above

577.

Drilling speed in aluminium nearly

578.

Drilling operation is an example of

579.

Helical grooves are provided on a drill bit

A.	To provide a passage for the coolant	B.	To remove chips
C.	To reduce the cost of the drill bit	D.	To provide long cutting edge
E.	To guide the cutting top

580.

Ceramic tool inserts are fixed to the tool holder by