Material Science And Metallurgy (3131904) MCQs

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

Showing 61 to 70 out of 79 Questions
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61.

A steel with 0.8% carbon and 100% pearlite is called

(a)

eutectoid steel
(b)

hypo-eutectoid steel
(c)

hyper-eutectoid steel
(d)

none of these
Answer:

Option (a)

62.

A steel with carbon __________ is known as hypo-eutectoid steel.

(a)

0.80%
(b)

below 0.8%
(c)

above 0.8%
(d)

between 0.8 to1%
Answer:

Option (b)

63.

For a steel containing 0.8% carbon

(a)

there is no critical point
(b)

there is only one critical point
(c)

there are two critical points
(d)

there can be any number of critical points
Answer:

Option (b)

64.

The austenitic stainless steel contains

(a)

18% chromium and 8% nickel
(b)

8% chromium and 18% nickel
(c)

14% chromium and 0.35% carbon
(d)

14% nickel and 0.35% carbon
Answer:

Option (a)

65.

A steel containing 16 to 18% chromium and about 0.12% carbon is called

(a)

ferritic stainless steel
(b)

austenitic stainless steel
(c)

martensitic stainless steel
(d)

nickel steel
Answer:

Option (a)

66.

A steel containing ferrite and pearlite is

(a)

hard
(b)

soft
(c)

tough
(d)

hard and tough
Answer:

Option (b)

67.

Pearlite consists of

(a)

13% carbon and 87% ferrite
(b)

13% cementite and 87% ferrite
(c)

13% ferrite and 87% cementite
(d)

6.67% carbon and 93.33% iron
Answer:

Option (b)

68.

Cementite consist of

(a)

13% carbon and 87% ferrite
(b)

13% cementite and 87% ferrite
(c)

13% ferrite and 87% cementite
(d)

6.67% carbon and 93.33% iron
Answer:

Option (d)

69.

In high speed steels, manganese is used to tougher the metal and to increase its

(a)

yield point
(b)

critical temperature
(c)

melting point
(d)

hardness
Answer:

Option (b)

70.

Which of the following gives the correct order of increasing hot hardness of cutting tool materials?

(a)

Diamond, Carbide, High speed steel
(b)

Carbide, Diamond, High speed steel
(c)

High speed steel, Carbide, Diamond
(d)

High speed steel, Diamond, Carbide
Answer:

Option (c)

Showing 61 to 70 out of 79 Questions
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