GATE MT kind:question PYQs & Answers — Page 36

Questions 351–360 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 36 of 65

V, the value of

(in J mol

) at 298 K is: __________ (round off to nearest integer).

Given: F = 96500 C mol

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Melting point of Cu is 1358 K and its enthalpy of melting is 13400 J mol

. The value of free energy change (in J mol

) for liquid to solid transformation at 1058 K is: __________ (round off to nearest integer).

Assume:

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A body is subjected to a state of stress given by the following stress tensor:

MPa.

If yielding is predicted by the Tresca Criterion, the uniaxial tensile yield stress (in MPa) of the body should be less than or equal to: __________ (round off to nearest integer).

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Consider homogeneous nucleation of a spherical solid in liquid. For a given undercooling, if surface energy of a nucleus increases by 20 %, the corresponding increase (in percent) in the critical radius of the nucleus is: __________ (round off to nearest integer).

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If saturation magnetization of iron at room temperature is 1700 kA m

, the magnetic moment (in A m

) per iron atom in the crystal is: ______ × 10

(round off to 1 decimal place).

(Given: Lattice parameter of iron at room temperature = 0.287 nm)

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In the X-ray diffraction pattern of a FCC crystal, the first reflection occurs at a Bragg angle (θ) of 30°. The Bragg angle (in degree) for the second reflection will be: __________ (round off to 1 decimal place).

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A 0.6 wt.% C steel sample is slowly cooled from 900 °C to room temperature. The fraction of proeutectoid ferrite in the microstructure is: __________ (round off to 2 decimal places).

Given: Eutectoid composition: 0.8 wt.% C Maximum solubility of carbon in α-Fe: 0.025 wt.% C

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If the degree of polymerization of polyethylene is 3000, the average molecular weight (in g mol

) is: __________ (round off to nearest integer).

(Given: Atomic weights of carbon and hydrogen are 12 and 1, respectively)

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Water flows over a plate of finite length. At

from the leading edge, the velocity of the flow is

. The thickness,

(in meter) of the boundary layer at

is: ______ (round off to 2 decimal places). Given:

is the free stream velocity.

Diagram for Metallurgical Engineering question 24

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The vacancy concentration in a crystal doubles upon increasing the temperature from 27 °C to 127 °C. The enthalpy (in kJ mol

) of vacancy formation is: ______ (round off to 2 decimal places). Given:

J mol

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GATE MT kind:question PYQs

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