GATE MT purpose:exam-prep PYQs & Answers — Page 10

Questions 91–100 of 650. Imported answers require independent review unless marked reviewed.

With reference to edge and screw dislocations, which of the following statements is/are CORRECT?

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

Both edge and screw dislocations can leave the slip plane by climb.

Burgers vector of a screw dislocation is parallel to its line vector.

Both edge and screw dislocations can leave the slip plane by cross-slip.

Strain energy per unit length of an edge dislocation is higher than that of a screw dislocation.

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Which of the following conditions is/are favorable for producing low-silicon hot metal in blast furnace ironmaking?

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

Reduced raceway adiabatic flame temperature

Oxygen-enriched blast

Lime injection through tuyeres

Increased hearth temperature

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Which of the following statements is/are CORRECT with respect to the initial stage of GP zone formation in a precipitation hardenable Al - 4.5 wt.% Cu alloy?

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

GP zones are Cu-rich clusters.

GP zones are CuAl₂ precipitates.

GP zones are incoherent with the matrix.

GP zones are coherent with the matrix.

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Which of the following techniques can be used to detect an internal defect in a metal casting?

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

Ultrasonic inspection

Liquid (or dye) penetrant inspection

Gamma-ray radiography

X-ray radiography

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Standard Gibbs free energies of formation of some solid oxides per mole of O₂ at 100 K are given below.

SiO₂: −728 kJ, TiO₂: −737 kJ, VO: −712 kJ, MnO: −624 kJ

Regarding thermodynamic feasibility of oxide reduction, which of the following statements is/are CORRECT under standard conditions at 1000 K?

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

Si can reduce TiO₂.

Mn can reduce VO.

Ti can reduce MnO.

V can reduce SiO₂.

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Consider a fully developed, steady, one-dimensional, laminar flow of a Newtonian liquid through a pipe. The maximum velocity in the pipe is proportional to which of the following quantities?

Given:

is the difference between the outlet and inlet pressure,

is the dynamic viscosity of the liquid, and

and

are radius and length of the pipe, respectively.

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

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The hydrostatic stress for the stress tensor provided below is _____ MPa (in integer).

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For an application where the Reynolds number is to be kept constant, a liquid with a density of 1 g cm

and viscosity 0.01 Poise results in a characteristic speed of 1 cm s

. If this liquid is replaced by another with a density of 1.25 g cm

and viscosity of 0.015 Poise, the characteristic velocity will be _____ cm s

(rounded off to one decimal place). Assume the characteristic length of the flow to be the same in both cases.

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Consider the gas phase reaction:

At equilibrium for a particular temperature, the partial pressures of CO, O

, and CO

are found to be

atm,

atm, and 16 atm, respectively. The equilibrium constant for the reaction is _____

(rounded off to one decimal place).

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A linear regression model was fitted to a set of

data. The total sum of squares and sum of squares of error are 120 and 12, respectively. The coefficient of determination (

) of the fit is _____ (rounded off to one decimal place).

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GATE MT purpose:exam-prep PYQs

Question 26

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Question 28

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Question 31

Question 32

Question 33

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Question 35