GATE XE year:2017 PYQs & Answers — Page 4

Questions 31–40 of 175. Imported answers require independent review unless marked reviewed.

Air flows over a smooth flat plate at a velocity of 4.39 m/s. The density of air is 1.031 kg/m³ and the kinematic viscosity is 1.34×10⁻⁵ m²/s. The plate length is 12.2 m in the direction of the flow. The boundary layer thickness (

) is given as

, where

is the distance from the leading edge and

is the Reynolds number. The boundary layer thickness (in meters, rounded off to the second decimal place) at 12.2 m from the leading edge will be ________

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A venturimeter of diameter 0.2 m at the entrance and 0.1 m at the throat is inclined upwards. The vertical elevation difference between the entrance and the throat is 0.5 m. The density of water is 1000 kg/m³ and the coefficient of velocity is 0.97. The differential U-tube manometer connected to the entrance and throat shows a pressure difference of 30 kN/m². Assume acceleration due to gravity as 9.81 m/s². The velocity of the water (in m/s, rounded off to the first decimal place) at the throat would be ________

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A spherical bubble of radius

is rising upward with a constant velocity

, in quiescent water of dynamic viscosity

. The density of air and water are denoted by

and

, respectively, and

is acceleration due to gravity. The bubble motion is such that the Reynolds number,

. The density of air can be neglected in comparison to the water density (

). Which one of the following expressions is TRUE for the density of water?

Your answerChoose one option.

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Which of the following is a Frenkel defect?

Your answerChoose one option.

One Cl vacancy and one Na vacancy in NaCl

One Zn vacancy and one Zn interstitial in ZnO

K at the Na site in NaCl

None of the above

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Which processing technique is best suited for manufacturing decorative PVC floor tiles?

Your answerChoose one option.

Blow molding

Filament winding

Rotational molding

Calendering

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During deformation of a semi-crystalline polymer, with spherulitic morphology, stressed in tension, what happens to the amorphous and the crystalline regions at the later stages?

Your answerChoose one option.

Amorphous regions remain intact and only crystallites experience bending and stretching of chains

Only amorphous regions elongate in the stress direction and crystallites remain intact

Amorphous regions elongate in the stress direction and crystallites experience bending and stretching of chain

None of the above

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Which of the following statement(s) is / are true regarding the structure-property correlation in polymers? (i) Polymers that are less coiled are more crystalline than those that are more coiled (ii) Branched polymers are more crystalline than the linear ones (iii) Polymers with inter-chain interactions have higher glass transition temperature than those without inter-chain interactions (iv) Polymers with inter-chain interactions are more crystalline than those without inter-chain interactions

Your answerChoose one option.

(i) and (ii)

(i) and (iii)

(ii) and (iv)

(ii) and (iii)

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The contrast obtained in scanning electron microscope using back scattered electrons depends on

Your answerChoose one option.

Atomic number of the specimen material

Accelerating voltage of the microscope

Working distance in the microscope

Type of the electron emitter in the microscope

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Ceramic materials fail at stresses much lower than their theoretical strength due to

Your answerChoose one option.

Presence of dislocations

High elastic modulus

Presence of voids

Anisotropy in crystal structure

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The Miller indices of the first three Bragg peaks in the X-ray diffraction pattern obtained from a polycrystalline iron sample at room temperature are

Your answerChoose one option.

(111), (200), (220)

(100), (110), (111)

(100), (110), (200)

(110), (200), (220)

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GATE XE year:2017 PYQs

Question 31

Question 32

Question 33

Question 34

Question 35

Question 36

Question 37

Question 38

Question 39

Question 40