GATE MT kind:question PYQs & Answers — Page 31

Questions 301–310 of 650. Imported answers require independent review unless marked reviewed.

Match the phenomena (Column I) with the descriptions (Column II)

Column I (P) Cottrell atmosphere (Q) Suzuki interaction (R) Bauschinger effect (S) Nabarro-Herring creep

Column II (1) Decrease in yield stress when loading direction is reversed (2) Stress assisted diffusion of vacancies resulting in plastic deformation in a polycrystalline material (3) Lüders bands (4) Segregation of solutes to the stacking fault

Your answerChoose one option.

P – 1, Q – 2, R – 3, S – 4

P – 1, Q – 2, R – 4, S – 3

P – 3, Q – 4, R – 1, S – 2

P – 3, Q – 1, R – 4, S – 2

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For a

matrix, the value of the determinant is −48 and the trace is 8. If one of the eigenvalues is 4, the other two are ________

Your answerChoose one option.

2, −3

1, −3

6, −2

−4, 0

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Which of the following statement(s) is(are) TRUE about black body radiation?

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

Among all radiation emitted by an ideal black body at room temperature, the most intense radiation falls in the visible light spectrum

The total emissive power of an ideal black body is proportional to the square of its absolute temperature

The emissive power of an ideal black body peaks at a wavelength

which is inversely proportional to its absolute temperature

The radiant energy emitted by an ideal black body is greater than that emitted by the non-black body at all temperatures above 0 K

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Which of the following parameter(s) influence(s) the melting rate of the consumable wire in a gas metal arc welding process?

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

Stick-out length

Weld speed

Welding current

Diameter of the consumable wire

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A non-rotating smooth solid spherical object is fixed in the stream of an inviscid incompressible fluid of density

(see figure). The flow is horizontal, slow, steady, and fully developed far from the object as shown by the stream arrows near point O. Which of the following statement(s) is(are) TRUE?

(Note: B is the center of the sphere and the straight horizontal line OAB intersects the surface of the sphere at the point A.)

Diagram for Metallurgical Engineering question 45

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

The velocity of the fluid at the point A is zero

The fluid pressure at the point A exceeds that at point O by the amount

, where

is the fluid velocity at point O

Fluid moving precisely along OA will turn perpendicular to OA to circumvent the object

On each side of the central streamline OA, the flow will be deflected round the object

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From high temperature tensile test, the flow stress (measured at the same value of strain) of an alloy was found to be 50 MPa at a strain rate of

and 70 MPa at a strain rate of

. The strain rate sensitivity parameter is ______ (round off to 3 decimal places).

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A spherical gas bubble of radius 0.01 mm is entrapped in molten steel held at 1773 K. If the pressure outside the bubble is 1.5 bar, the pressure inside the bubble is ______ bar (round off to 1 decimal place).

Given: 1 bar =

Pa and the surface tension of the steel at 1773 K is

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What is the equilibrium

ratio for the given reaction at 1873 K? (round off to 2 decimal places)

Mo(s) + O

(g) ↔ MoO

(s)

Given:

;

and

for the reaction CO(g) + 0.5O

(g) ↔ CO

(g);

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The emf of the cell

Au-Pb(liquid) | PbCl

-KCl(liquid) | Cl

(gas, 0.5 atm), C(graphite)

is 1.2327 V at 873 K. Activity of Pb in the Au-Pb alloy is 0.72 and the activity of PbCl

in the electrolyte is 0.18. The standard Gibbs energy of formation of PbCl

(liquid) at 873 K is ______ kJ·mol

(round off to 1 decimal place).

Given:

and

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Consider a tilt boundary of misorientation of

in an aluminium grain. The lattice parameter of aluminium is 0.4 nm. The spacing between the dislocations that form the tilt boundary is ______ nm (round off to 2 decimal places).

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GATE MT kind:question PYQs

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