GATE XE purpose:exam-prep PYQs & Answers — Page 60

Questions 591–600 of 1772. Imported answers require independent review unless marked reviewed.

Topic practice 1772 questionsPage 60 of 178

In age-hardening of an aluminium alloy, the purpose of solution treatment followed by quenching is to

Your answerChoose one option.

form martensitic structure

increase the size of the precipitates

form supersaturated solid solution

form precipitates at the grain boundaries

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The magnetization (M) – magnetic field (H) curves for four different materials are given below. Which one of these materials is most suitable for use as a permanent magnet?

Your answerChoose one option.

Diagram for Engineering Sciences question 45

Diagram for Engineering Sciences question 45 (figure 2)

Diagram for Engineering Sciences question 45 (figure 3)

Diagram for Engineering Sciences question 45 (figure 4)

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The band gap of a semiconducting material is ∼ 2 eV. Which one of the following absorption (A) vs. energy (in eV) curves is correct?

Your answerChoose one option.

Diagram for Engineering Sciences question 46

Diagram for Engineering Sciences question 46 (figure 2)

Diagram for Engineering Sciences question 46 (figure 3)

Diagram for Engineering Sciences question 46 (figure 4)

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Figures (i) and (ii) show a binary phase diagram and the corresponding Gibbs free energy (

) vs. composition (

) diagram, respectively. Figure (ii) corresponds to which one of the temperatures shown in Figure (i)?

Diagram for Engineering Sciences question 47

Your answerChoose one option.

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Aliovalent doping of

leads to the formation of defects. Which one of the following is the correct defect reaction?

Your answerChoose one option.

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A screw dislocation in a FCC crystal has Burgers vector of

, where

is the lattice constant. The possible slip plane(s) is/are:

Your answerSelect all correct options. You can choose more than one.

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The tensile true stress (

) – true strain (

) curve follows the Hollomon equation:

At the maximum load, the work-hardening rate

is (in MPa): ____________ (round off to nearest integer)

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A metal has a certain vacancy fraction at a temperature of 600 K. On increasing the temperature to 900 K, the vacancy fraction increases by a factor of ____________ (round off to one decimal place)

Given: Gas constant, R = 8.31 J mol

and activation energy for vacancy formation, Q = 68 kJ mol

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In a semiconductor, the ratio of electronic mobility to hole mobility is 10. The density of electrons and holes are

and

, respectively. If the conductivity of the material is

, then the mobility of holes is (in

): ____________ (rounded off to nearest integer)

Given: Charge of an electron:

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A student performed X-ray diffraction experiment on a FCC polycrystalline pure metal. The following

values were calculated from the diffraction peaks.

However, the student was negligent and missed noting one of the peaks. Which one of the following Miller indices corresponds to the missing peak?

Your answerChoose one option.

(200)

(220)

(311)

(222)

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GATE XE purpose:exam-prep PYQs

Question 44

Question 45

Question 46

Question 47

Question 48

Question 49

Question 50

Question 51

Question 52

Question 53