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171.

Muntz metal contains

172.

Carbon steel is

A.	An alloy of carbon and iron with varying quantities of phosphorous	B.	An alloy of carbon and iron obtained by oxidising excessive carbon from cast iron
C.	An alloy of carbon and iron obtained by oxidising excessive carbon steel	D.	An alloy of carbon generally obtained by adding graphite to low carbon steels
E.	None of the above

173.

"Troosite" is obtained when

A.	Quenching steel during transformation	B.	A fully hardened steel is finally drawn at about 677?C
C.	Steel is rapidly quenched in oil	D.	When alloy steels are rapidly quenched in water
E.	None of the above

174.

In order to improve machinability of steels, the treatment generally done is

175.

Cyaniding is the process of

A.	Adding carbon steel	B.	Adding carbon and nitrogen to increase hardness of core
C.	Adding carbon and nitrogen to increase hardness of specimen uniformly	D.	Adding carbon and nitrogen to increase hardness at the surface
E.	Creating a layer on the surface to impart the property of wear resistance

176.

Electronic structure of a material is generally studied by

A.	Naked eye	B.	Microscope
C.	X-ray and electron diffraction	D.	Spectroscope techniques
E.	Mossbauer studies

177.

The product of a cupola known as

178.

Blast furnace gas is

A.	A flue gas discharged to atmosphere	B.	Highly poisonous
C.	Used as fuel in a blast furnace	D.	A by-product of blast furnace
E.	Used as a cooking gas

179.

Wrought iron is

A.	Soft	B.	Hard
C.	Least resistant to corrosion	D.	Highly resistant to corrosion
E.	Heat treated to change its properties

180.

The depth hardness of steel increases by the addition of