Engineering :: Foundry Technology

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211.

Grey cast iron is

A.	costlier than other varieties of cast iron	B.	poor in machining ability
C.	resistant to shock	D.	least fluid in molten condition

212.

Graphitic cast iron is

A.	hard	B.	non-machinable
C.	high in compressive strength	D.	low in damping capacity

213.

White cst iron contains

A.	free graphite	B.	cementite
C.	free carbon	D.	none of the above

214.

Addition of nickel to cast iron increases

A.	hardness	B.	corrosion resistance
C.	tensile strength	D.	all of the above

215.

Molybdenum upto 1.5% is added to cast iron to

A.	improve strength	B.	reduce wear resistance
C.	increase machinability	D.	all of the above

216.

Which of the following is very powerful carbide former in cast iron?

A.	Silicon	B.	Vanadium
C.	Chromium	D.	Nickel

217.

Which of the following cast iron is resistant to attack by sea water?

A.	Low chromium cast iron	B.	Low nickel cast iron
C.	Low sulphur cost iron	D.	Low phosphorous cast iron

218.

High silicon irons are

A.	resistant to wear	B.	machinable
C.	malleable	D.	brown in colour

219.

Which variety of cast iron can be forged?

A.	Grey cast iron	B.	High silicon cast iron
C.	Wrought iron	D.	All of the above

220.

Alloy containing 70% nickel and 30% copper is known as

A.	hastalloy	B.	monel metal
C.	N-c alloy	D.	permalloy