GATE XE kind:question PYQs & Answers — Page 44

Questions 431–440 of 1772. Imported answers require independent review unless marked reviewed.

Which of the following figures schematically represent(s) either the Frenkel defect or the Schottky defect in ionic solids?

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

Diagram for Engineering Sciences question 59

Diagram for Engineering Sciences question 59 (figure 2)

Diagram for Engineering Sciences question 59 (figure 3)

Diagram for Engineering Sciences question 59 (figure 4)

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Given that k is the first order reaction rate constant and T is the temperature in absolute scale, the temperature dependence of rate constant is/are represented by

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

Diagram for Engineering Sciences question 60

Diagram for Engineering Sciences question 60 (figure 2)

Diagram for Engineering Sciences question 60 (figure 3)

Diagram for Engineering Sciences question 60 (figure 4)

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For chemical vapour deposition (CVD) process, which of the following statements is/are correct?

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

Target material is striped off by the bombardment of positive ions

Source material is vapourized and thermally decomposed

Partial hydrolysis of alkoxide in water solvent

Suitable for preparing films of high density and uniform thickness

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At room temperature, the electrical conductivity and electron mobility for aluminium are 3.8 × 10^7 (Ω m)^−1 and 0.0012 m^2 (V s)^−1, respectively. Density of free electrons for aluminium at room temperature is (in units of m^−3) ______ × 10^27 (rounded off to nearest integer).

Given: Electrical charge on an electron is 1.6 × 10^−19 C.

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A 2 mm thick palladium sheet of 1000 mm

cross section is used as a diffusional membrane to purify hydrogen. The hydrogen concentration is maintained at a steady state with

kg m

and

kg m

on the two sides of the membrane as shown in the figure below.

Diagram for Engineering Sciences question 63

The rate of hydrogen purification is (in units of kg hr

) ______ × 10

(rounded off to one decimal place).

Given: The diffusion coefficient of hydrogen in palladium is 1.0 × 10

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In X-ray powder diffraction pattern obtained from a face centered cubic (FCC) metal, the first five reflections are at θ = 21.65°, 25.21°, 37.06°, x and 47.58°. The Bragg angle, θ of the fourth reflection is missed out and is represented by x. The value of x is (in degree) __________ (rounded off to one decimal place).

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Consider a unidirectionally aligned continuous glass fiber reinforced epoxy composite with 40 vol. % reinforcement. The elastic modulus of the composite along the fiber direction is (in units of GPa) ________ (rounded off to one decimal place).

Given: Elastic modulus of epoxy is 6.9 GPa and that of glass fibre is 69 GPa.

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The engineering stress (σ) vs. engineering strain (ε) curve obtained by conducting uniaxial tension test on a steel specimen is shown in the figure (the sketched curve is not to the scale). The specimen exits cup-and-cone failure within its gage length. Which point on the curve corresponds to the beginning of necking in the test specimen?

Diagram for Engineering Sciences question 66

Your answerChoose one option.

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An L-shaped rigid member is fixed at the midpoint of a simply-supported beam, as shown in figure (i). The member is subjected to a vertically downward force P at its free end. In an equivalent system, the member along with the applied load is replaced with a force Q = P and a moment M (see figure (ii)). Which of the following statements is correct?

(Negelect the mass of the beam and of the rigid member)

Diagram for Engineering Sciences question 67

Diagram for Engineering Sciences question 67 (figure 2)

Your answerChoose one option.

M = P a

M = P b

M = P (a + b)

M = 0

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A block of weight W, placed on a surface, is subjected to a horizontal force P as shown in the figure. The line of action of force P passes through the center-of-gravity of the block. The magnitude of P is such that the block remains at rest. If N is the resultant normal reaction exerted by the surface, and F is the frictional force acting on the bottom surface of the block, then which of the following represents the correct free body diagram of the block?