Mechanical Engineering

Question: Chilled cast iron is produced
[A].

by adding magnesium to molten cast iron

[B].

by quick cooling of molten cast iron

[C].

from white cast iron by annealing process

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Cast iron has
[A].

high compressive strength

[B].

excellent machinability

[C].

good casting characteristic

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: Cast iron is used in those parts which are subjected to shocks.
[A].

Correct

[B].

Incorrect

Answer: Option B

Explanation:

No answer description available for this question.

Question: Cast iron is a
[A].

ductile material

[B].

malleable material

[C].

brittle material

[D].

tough material

Answer: Option C

Explanation:

No answer description available for this question.

Question: Cast iron is manufactured in
[A].

blast furnace

[B].

cupola

[C].

open hearth furnace

[D].

bessemer converter

Answer: Option B

Explanation:

No answer description available for this question.

Question: Combined carbon in iron makes the metal
[A].

soft and gives coarse grained crystalline structure

[B].

soft and gives a fine grained crystalline structure

[C].

hard and gives a coarse grained crystalline structure

[D].

hard and gives a fine grained crystalline structure

Answer: Option D

Explanation:

No answer description available for this question.

Question: Free carbon in iron makes the metal
[A].

soft and gives a coarse grained crystalline structure

[B].

soft and gives a fine grained crystalline structure

[C].

hard and gives a coarse grained crystalline structure

[D].

hard and gives a fine grained crystalline structure

Answer: Option A

Explanation:

No answer description available for this question.

Question: The carbon in the pig iron varies from
[A].

0.1 to 0.5%

[B].

0.5 to 1%

[C].

1 to 5%

[D].

5 to 10%

Answer: Option C

Explanation:

No answer description available for this question.

Question: In iron, the presence of carbon in free form is called graphite.
[A].

Agree

[B].

Disagree

Answer: Option A

Explanation:

No answer description available for this question.

Question: In the middle part of the blast furnace (zone of absorption), the temperature is
[A].

400° to 700°C

[B].

800°C to 1000°C

[C].

1200°C to 1300°C

[D].

1500°C to 1700°C

Answer: Option B

Explanation:

No answer description available for this question.