Material Science And Metallurgy (3131904) MCQs

MCQs of Allotropy of Iron, Iron-Iron-Carbide equilibrium system

Showing 21 to 30 out of 79 Questions
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21.

Cast iron has

(a)

high compressive strength
(b)

excellent machinability
(c)

good casting characteristic
(d)

all of these
Answer:

Option (d)

22.

Malleable 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 (c)

23.

White cast iron has

(a)

carbon in the form of carbide
(b)

low tensile strength
(c)

high compressive strength
(d)

all of these
Answer:

Option (d)

24.

According to Indian standard specifications, cast iron designated by 'FG 150' means

(a)

white cast iron with B.H.N. 150
(b)

white cast iron with 150 MPa as minimum compressive strength
(c)

grey cast iron with B.H.N. 150
(d)

grey cast iron with 150 MPa as minimum tensile strength
Answer:

Option (d)

25.

Grey cast iron has

(a)

carbon in the form of free graphite
(b)

high tensile strength
(c)

low compressive strength
(d)

all of these
Answer:

Option (a)

26.

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

(a)

nickel
(b)

chromium
(c)

copper
(d)

magnesium
Answer:

Option (d)

27.

When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces

(a)

white cast iron
(b)

nodular cast iron
(c)

malleable cast iron
(d)

alloy cast iron
Answer:

Option (d)

28.

Sulphur in cast iron

(a)

makes the iron soft and easily machinable
(b)

increases hardness and brittleness
(c)

makes the iron white and hard
(d)

aids fusibility and fluidity
Answer:

Option (b)

29.

Which of the following inpurity in cast iron makes it hard and brittle?

(a)

Silicon
(b)

Sulphur
(c)

Manganese
(d)

Phosphorus
Answer:

Option (b)

30.

According to Indian standard specifications, SG 400/15 means

(a)

spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 Mpa
(b)

spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation
(c)

spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area
(d)

none of the above
Answer:

Option (b)

Showing 21 to 30 out of 79 Questions
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