GATE PI Engineering Materials PYQs & Answers — Page 2

Questions 11–20 of 23. Imported answers require independent review unless marked reviewed.

Topic practice 23 questionsPage 2 of 3

As per the Fe-C phase diagram, the microstructure of plain carbon steel with 0.4 wt.% carbon at room temperature contains

Your answerChoose one option.

proeutectoid ferrite and pearlite

proeutectoid cementite and pearlite

ferrite and austenite

austenite and cementite

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Which one of the following metals has a face-centered cubic (FCC) structure?

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Alpha iron

Chromium

Magnesium

Aluminum

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denotes the shear modulus of an isotropic material, then the maximum possible value of Young’s modulus of the material is

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A eutectoid steel with 100% austenite is cooled from a temperature of 750 °C to a room temperature of 35 °C. Match the cooling methods with transformed structures.

Cooling method	Transformed structure
P — Water quenching	1 — Coarse pearlite
Q — Oil quenching	2 — Fine pearlite
R — Air cooling	3 — Martensite
S — Furnace cooling	4 — Very fine pearlite

Your answerChoose one option.

P-1, Q-2, R-3, S-4

P-2, Q-3, R-4, S-1

P-3, Q-4, R-2, S-1

P-3, Q-4, R-1, S-2

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Pearlite microstructure in an eutectoid steel consists of alternating layers of two phases, namely α ferrite and

Your answerChoose one option.

Martensite

Austenite

Cementite

Bainite

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Group I lists phases of steel and Group II lists crystal structures in the table below.

Group I P. Ferrite Q. Austenite R. Martensite

Group II

Hexagonal Close Packed (HCP)

Body Centered Cubic (BC)

Body Centered Tetragonal (BT)

Face Centered Cubic (FC)

Match the phase with the corresponding crystal structure.

Your answerChoose one option.

P-2, Q-4, R-3

P-4, Q-2, R-3

P-2, Q-4, R-1

P-4, Q-2, R-1

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In a uniaxial tensile test on a specimen of a ductile material, the ultimate tensile strength is found to be 400 MPa and the elongation up to the maximum load is 25%. The true stress at the maximum load in MPa is __________.

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Match the crystal structure in Column A with the corresponding packing fractions in Column B of the table.

Column A	Column B
1 Simple cubic	P 0.74
2 Hexagonal close-packed	Q 0.68
3 Body-centered cubic	R 0.52
4 Face-centered cubic

Your answerChoose one option.

1-P, 2-R, 3-Q, 4-Q

1-R, 2-P, 3-R, 4-Q

1-R, 2-P, 3-Q, 4-P

1-P, 2-R, 3-P, 4-Q

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A metallic rod of diameter

is subjected to the tensile test. The engineering stress and the true stress at fracture are 800 MPa and 900 MPa, respectively. The ratio of the rod diameter at fracture

to the initial diameter

is _____ (round off to 2 decimal places)

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When austenite decomposes upon cooling into two phases—ferrite and cementite, the reaction is called

Your answerChoose one option.

Eutectic

Eutectoid

Peritectic

Peritectoid

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GATE PI Engineering Materials PYQs

Question 46

Question 13

Question 14

Question 39

Question 6

Question 6

Question 23

Question 6

Question 17

Question 4