GATE MT purpose:exam-prep PYQs & Answers — Page 35

Questions 341–350 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 35 of 65

Elements A and B have the same crystal structure. For a dilute solution of B in A, which one of the following is true?

(Given:

– Mixing enthalpy,

– Activity of B and

– Mole fraction of B)

Your answerChoose one option.

, then

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For uniaxial tensile stress-strain behaviour of polycrystalline aluminium, which one of the following statements is FALSE?

Your answerChoose one option.

True stress is always higher than the engineering stress.

At the ultimate tensile stress point on the true stress - strain curve,

Resilience is the area under the elastic region of the engineering stress - strain curve.

Maximum true stress does not correspond to the maximum load.

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Which one of the following is FALSE for creep deformation?

Your answerChoose one option.

The minimum creep rate is obtained in the primary stage (stage I).

Creep resistance decreases with decrease in grain size.

Coble creep occurs via grain boundary diffusion.

Nabarro-Herring creep occurs via lattice diffusion.

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Which one of the following elements alloyed with iron is a ferrite stabilizer?

Your answerChoose one option.

Nickel

Manganese

Carbon

Silicon

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Which one of the following is the correct decreasing sequence of Quenching Power for quenchants used in heat treatment of steels?

Your answerChoose one option.

Oil > Water > Brine > Air

Brine > Oil > Water > Air

Brine > Water > Oil > Air

Water > Brine > Oil > Air

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For a zeroth order chemical reaction, which one of the following is FALSE?

Your answerChoose one option.

Concentration versus time plot is a straight line.

Increase in concentration of reacting species increases the rate of reaction.

Half-life depends on the initial concentration and zero-order rate constant.

Rate of reaction depends on temperature.

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Which one of the following elements oxidizes first in basic oxygen steel making process?

Your answerChoose one option.

Silicon

Carbon

Manganese

Phosphorus

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Which one of the following is a hydrometallurgical operation?

Your answerChoose one option.

Roasting

Leaching

Zone refining

Smelting

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The value of

is: __________ (round off to nearest integer).

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The grain size (X) of annealed specimens follows a symmetric distribution with a mean (μ) of 5 μm and a standard deviation (σ) of 0.5 μm. The percentage of specimens with grain size in the range 5 to 6 μm is expected to be: __________ (round off to nearest integer).

Given: For the symmetric distribution: Probability P(X ≤ μ + 2σ) = 0.98

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