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621.

Which of the following is considered to be non-machinable by conventional processes?

A.	Grey cast iron	B.	Cast copper
C.	While cast iron	D.	Silicon bronze

622.

Which of the following is not true for diamond?

A.	If the hardest substance known	B.	Expensive to be shaped
C.	It is ductile	D.	It is also used as a cutting tool

623.

Carbon tool steel are broadly classified into two categories as

A.	warping and non-warping	B.	hard and brittle
C.	water hardening and oil hardening	D.	hard and soft

624.

Carbon tool steels generally loose their hardness above

A.	50?C	B.	100?C
C.	125?C	D.	200?C

625.

Which of the following is a ferrous cutting tool?

A.	Diamond	B.	HSS
C.	Cast carbides	D.	Ceramics

626.

Low helix drills are used for machining

A.	Brass	B.	bronze
C.	bakelite	D.	Any of the above

627.

Machinability is affected by

A.	tool geometry and material	B.	cutting fluids
C.	regidity of tool and machine	D.	All of the above

628.

Which of the following is not used for orthogonal cutting?

A.	Broaching	B.	Sawing
C.	Drills	D.	Slotting cutter

629.

All of the following are used for oblique cutting EXCEPT:

A.	Lathe tools	B.	Milling cutters
C.	Drills	D.	Slotting cutter

630.

Flywheel is not provided in case of

A.	manually operated presses	B.	crank type presses
C.	hydraulic presses	D.	All of the above