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651.

Hardness of work surface affects honing by

A.	varying the rate of stock removal	B.	poor surface finish
C.	coolant consumption	D.	All of the above

652.

Which of the following is the most common bond used in grinding wheels?

A.	Vitrified bond	B.	Shellac bond
C.	Rubber bond	D.	Pakelite bond

653.

In rubber bond for grinding wheels, sulphur is added to

A.	act as vulcanising agent	B.	dissipate heat during grinding operation
C.	reduce shocks and vibrations	D.	make the bond flexible

654.

While specifying a grinding wheel, which of the following is the optional specification?

A.	Type of bond	B.	Gram size
C.	Structure	D.	Grade

655.

Abrasive GC indicates

A.	Al2O3	B.	SiC
C.	White Al2O3	D.	Green grit SiC

656.

Loading of grinding wheel occurs when

A.	part of grinding surface gives way	B.	follow cavities are formed on the surface of grinding wheel
C.	abrasive grains become clogged with particles of metal being ground	D.	long cracks develop on grinding wheel from centre to outer diameter

657.

Which of the following is very hard grade?

A.	T - Z	B.	L - O
C.	G - K	D.	A - E

658.

For centreless grinding the surface speed is

A.	500 to 600 metres per minute	B.	600 to 900 metres per minute
C.	1200 to 1500 metres per minute	D.	1500 to 1800 metres per minute

659.

While grinding the increase in wheel speed, with constant feed rate, results in

A.	shining surface	B.	abrasive marks on work piece
C.	reduction of the chip size	D.	glazing of wheel

660.

The speed of grinding wheel is limited by

A.	type of bond	B.	grinding operation
C.	rigidity of grinding machine	D.	All of the above