GATE MT format:mcq PYQs & Answers — Page 33

Questions 321–330 of 379. Imported answers require independent review unless marked reviewed.

Topic practice 379 questionsPage 33 of 38

For intrinsic Si at room temperature, the electron concentration = the hole concentration =

, and the electron and hole mobilities are 0.1 and 0.2 m

·V

·s

respectively. What is the room temperature electrical conductivity?

The charge of an electron is

Your answerChoose one option.

0 (Ω·m)

1.6 × 10

(Ω·m)

3.2 × 10

(Ω·m)

4.8 × 10

(Ω·m)

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To minimize refractory loss during BOF steel-making, slag is supersaturated with which of the following:

Your answerChoose one option.

SiO

MgO

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Which of the following weld processes is NOT suitable for joining in metal sheets?

Your answerChoose one option.

Gas Metal Arc Welding

Electro Slag Welding

Electron Beam Welding

Laser Beam Welding

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Which of the following categories of materials is suitable as a filler for brazing of steel sheets?

Your answerChoose one option.

Epoxy resin

Near-eutectic alloys

Refractory alloys

Large freezing range alloys

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Arrange the following processes in INCREASING magnitude of surface roughness of the cast.

P. Investment casting Q. Permanent mold casting R. Pressure die casting S. Sand casting

Your answerChoose one option.

R < S < Q < P

P < S < Q < R

R < P < Q < S

Q < P < R < S

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In a Jominy end-quench test of the eutectoid plain-carbon steel, which of the following represents the sequence of microstructures observed from the quenched end of the specimen?

Your answerChoose one option.

Fine Pearlite, Coarse Pearlite, Martensite and Pearlite, Martensite

Martensite, Martensite and Pearlite, Fine Pearlite, Coarse Pearlite

Coarse Pearlite, Pearlite and Martensite, Fine Pearlite, Martensite

Martensite, Martensite and Pearlite, Coarse Pearlite, Fine Pearlite

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A long oil pipeline made of steel is suspected to have developed a scale on the inner surface due to corrosion. Which of the following non-destructive techniques is the most suitable for detecting and quantifying such a defect?

Your answerChoose one option.

Dye penetrant test

Magnetic particle inspection

Ultrasonic inspection

Acoustic emission

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A steel is plastically worked in the temperature range below the nose of the TTT curve and above M

, followed by quenching to produce fine martensite. What is this process called?

Your answerChoose one option.

Martempering

Ausforming

Inter-critical form

Normalizing

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What is the requirement for equilibrium at a triple junction as shown in the schematic, with

and

as grain boundary tensions and

and

as dihedral angles?

Diagram for Metallurgical Engineering question 21

Your answerChoose one option.

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The molar free energy (J mol

) of a liquid solution of a binary A-B alloy as a function of temperature (

) and composition (

, the mole fraction of B) is given by:

where

and

are the molar free energies of pure liquid A and pure liquid B. What is the excess molar free energy,

, for an alloy with

Given: Gas constant R = 8.314 J K

mol

Your answerChoose one option.

100 J mol

−200 J mol

463 J mol

−563 J mol

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GATE MT format:mcq PYQs

Question 13

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Question 19

Question 20

Question 21

Question 26