EOM 3 PAPER 4

16,Periodical heat treatment is not necessary if the chains are made of mild steel with a manganese percentage of?,

0.06,

0.5,

1.0,

1.5,

17,The process of heating steel to a temparature slightly above critical temparature and allowing it to cool naturally in air is called?

Forging,

Normalising

Annealing,

Hardening,

18,The object of normalising is?,

To remove internal strains,

To reduce the size of crystal grains,

To improve the strength

None,

19,The process of heating steel gradually uniformely to a temparature higher than the critical temparature and then cooled rapidly by quenching water is called?

Forging,

Normalising,

Annealing,

Hardening,

20,The elements in the GUNMETAL are?,

Copper and zinc,

Copper ; 

tin and zinc,

Copper and tunston and nickel,

None,

Ans

1.4

2.2

3.2

4.4

5.2