Metallurgical Engineering Gate Yearwise 



Metallurgical Engineering Gate 2020 Questions with Answer

Ques 14 GATE 2020

Which one of the following statements regarding selective leaching of a binary alloy is TRUE?

A

The lower atomic weight element is leached.

B

The element having higher diffusivity is leached.

C

The more electronegative element is leached.

D

The element with lower density is leached.


(c) is the correct answer.

Ques 15 GATE 2020

Cupola is a furnace used to produce _______.

A

cast irons.

B

plain carbon steels.

C

copper alloys.

D

aluminium alloys.


(a) is the correct answer.

Ques 16 GATE 2020

For effective communition in a ball mill, it is desired that the balls travelling along the mill wall leave the wall at point C and travel freely in air along the path CDA, as shown in the figure. If ∠BOC is 120°, the rotational speed of the mill is _______ rpm (rounded off to one decimal place) by performing suitable force balance at point C.
Assume:
1. There is no slip between the ball and mill wall.
2. O is the rotational axis of the mill and OB is parallel to the vector g.
3. Inner diameter of ball mill is 3.26 m.
4. Acceleration due to gravity g is 9.8 m⋅s⁻².


(16.7) is the correct answer.

Ques 17 GATE 2020

P, Q, R and S are to be uniquely coded using α and β. If P is coded as αα and Q as αβ, then R and S, respectively, can be coded as ________.

A

βα and αβ

B

ββ and αα

C

αβ and ββ

D

βα and ββ


(d) is the correct answer.

Ques 18 GATE 2020

In green sand casting, which one of the following is NOT a part of the gating system?

A

Runner

B

Sprue

C

Riser

D

Pouring basin


(c) is the correct answer.

Ques 19 GATE 2020

Match the products in Column I with the manufacturing processes in Column II.

A

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

B

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

C

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

D

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


(d) is the correct answer.

Ques 20 GATE 2020

Match the processes in Column I with the most appropriate mechanisms in Column II.

A

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

B

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

C

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

D

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


(c) is the correct answer.

Ques 21 GATE 2020

Match the reactors in Column I with the corresponding products in Column II.

A

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

B

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

C

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

D

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


(c) is the correct answer.

Ques 22 GATE 2020

In a top gated mold, liquid metal enters the mold cavity as a freely falling stream under gravity from a height of 0.5 m. Ignore the fluid friction due to viscosity and the drag due to changes in the direction of flow. If the volume of the mold cavity is 10 m³ then the time required to fill the mold is _______ s (round off to nearest integer).
Given:
1. Acceleration due to gravity is 9.8 m⋅s⁻².
2. Cross-sectional area of gate is 0.2 m².


(16) is the correct answer.

Ques 23 GATE 2020

The number of independent elastic constants of an isotropic material is:

A

1

B

2

C

3

D

4


(b) is the correct answer.

Ques 24 GATE 2020

A slip system consists of a slip plane and a slip direction. Which one of the following is NOT a valid slip system in a FCC copper crystal?

A

(111)[110]

B

(111)[011]

C

(111)[101]

D

(111)[101]


(b) is the correct answer.

Ques 25 GATE 2020

A dielectric material is:

A

Electrical conductor

B

Metallic magnet

C

Two coupled electrical conductors

D

Electrical insulator


(d) is the correct answer.

Ques 26 GATE 2020

For a material to exhibit superplasticity, one of the requirements is:

A

Coarse-grained microstructure

B

High strain-rate sensitivity

C

Low strain-hardening exponent

D

High modulus of elasticity


(b) is the correct answer.

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