When carbon in the cast iron is principally in the form of graphite, the cast iron will be of

Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

A

Silicon

B

Sulphur

C

Manganese

D

Phosphorus

With increase in carbide/graphite ratio in cast iron, its

A

Hardness & brittleness increases

B

Ductility decreases

C

Both A & B

D

Neither A nor B

When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.

A

Cementite

B

Free graphite

C

Both A and B

D

None of these

White cast iron as compared to grey cast iron is

A

More durable

B

Very brittle

C

Very hard

D

All of the above

Nodular cast iron is produced by adding ________ to the molten cast iron.

A

Nickel

B

Chromium

C

Copper

D

Magnesium

An important property of malleable cast iron in comparison to grey cast iron is the high

A

Compressive strength

B

Ductility

C

Carbon content

D

Hardness

__________ of grey cast iron produces white cast iron.

A

Tempering

B

Rapid heating

C

Rapid cooling

D

Slow cooling

Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.

A

Manganese

B

Phosphorous

C

Magnesium

D

Chromium

A Person living wholly or principally on vegetable is called

A

frultarian

B

vegetation

C

gregarious

D

vegetarian

Unemployment might principally and eventually lead to.

A

social disorder

B

high cost of production

C

slowing down of industrialization

D

resistance to technological changes and rationalization

When carbon in the cast iron is principally in the form of graphite, the cast iron will be of

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