Engineering :: Metallurgy

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21.

The flux used in brazing is usually

22.

Which metal has the lowest melting point?

23.

Which of the following metals has highest specific gravity?

24.

Which of the following metal has the lowest specific gravity?

25.

The process of providing zinc coating on steel pipes is known as

26.

Galvanising layer usually provides protection in the range of water

A.	1 to 7	B.	7 to 14
C.	1 to 14	D.	6 to 11
E.	Complete protection is provided

27.

Uniformity of zinc coating on pipes is tested by

A.	Dipping the sample in water	B.	Dipping the sample for 1 minute in conc, hydrochloric acid
C.	Dipping the sample for 1 minute in neutral copper sulphate solution	D.	Dipping the sample for 10 minutes in calcium hydroxide solution
E.	By passing electric current for 1 hour

28.

Which of the following is usually not a constituent of paints?

29.

Attack of steel is increased by

A.	Salt solution below a paint coat	B.	Invisible moisture film present prior to painting
C.	Graphite in the priming coat	D.	Loose rust and partially removed mill scale
E.	All of the above

30.

Which of the following material can bear sudden and excessive shocks better?

A.	Cast iron	B.	Pig iron
C.	White iron	D.	Wrought iron
E.	All have same shock bearing capacity