GATE XE format:mcq PYQs & Answers — Page 43

Questions 421–430 of 959. Imported answers require independent review unless marked reviewed.

Topic practice 959 questionsPage 43 of 96

On the basis of the ideal gas equation and van der Waals equation, the temperatures of a gas at pressure 10 MPa and specific volume 0.005 m³/kg would be, respectively

(Assume gas constant

kJ/(kg K),

m⁶ kPa/kg² and

m³/kg)

Your answerChoose one option.

166.67 K and 235.89 K

166.67 K and 206.40 K

166.67 K and 267.21 K

166.67 K and 240.90 K

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An ideal Brayton cycle operates between maximum and minimum temperatures of

and

, respectively. For constant values of

and

, the pressure ratio (

) for maximum work output is

(

is the specific heat ratio of air)

Your answerChoose one option.

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Interfacial polymerization can be used to prepare

Your answerChoose one option.

Nylon 6

Nylon 66

Polyacrylonitrile

Poly(butyl acrylate)

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In a rubber sample with a Mooney viscosity of 60 ML(1+4) 100 °C, the number 4 signifies

Your answerChoose one option.

Applied shear rate in s⁻¹

Number of samples tested

Time in minutes after starting the motor when the measurement is taken

Preheating time in minutes

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The initiator system which can be used for free radical polymerization at 5 °C is

Your answerChoose one option.

FeSO₄ + t-butyl hydroxide

Azobisisobutyronitrile

Potasium persulfate

Benzoyl peroxide

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Weather resistance of high impact polystyrene can be improved by blending polystyrene with

Your answerChoose one option.

Styrene butadiene rubber

Natural rubber

Ethylene propylene rubber

Nitrile rubber

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Which of the following is a discontinuous polymer processing operation?

Your answerChoose one option.

Calendering

Extrusion

Film blowing

Thermoforming

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The blend of polyethylene and polypropylene is

Your answerChoose one option.

Immiscible due to enthalpic constraints

Immiscible due to entropic constraints

Miscible as they are polyolefins

Miscible due to comparable solubility parameters

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From the dynamic mechanical analysis of a polymer sample with a phase angle of 30°, the relationship between storage modulus (E') and loss modulus (E'') can be expressed as

Your answerChoose one option.

E' = √3 E''

2E' = √3 E''

E'' = √3 E'

2E'' = √3 E'

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Match the properties in Column A with their respective unit in Column B

Column A: P. Surface resistivity Q. Volume resistivity R. Coefficient of thermal expansion S. Electrical conductivity

Column B:

Ohm-cm

S cm⁻¹

Ohm

K⁻¹

Your answerChoose one option.

P-1; Q-3; R-4; S-2

P-2; Q-3; R-1; S-4

P-3; Q-1; R-4; S-2

P-3; Q-1; R-2; S-4

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GATE XE format:mcq PYQs

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