GATE XE year:2019 PYQs & Answers — Page 10

Questions 91–100 of 175. Imported answers require independent review unless marked reviewed.

Topic practice 175 questionsPage 10 of 18

Addition of a reheat process to a simple Rankine cycle will always

Your answerChoose one option.

increase both efficiency and work output of the cycle.

increase efficiency but not necessarily work output of the cycle.

increase work output but not necessarily efficiency of the cycle.

decrease both efficiency and work output of the cycle.

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A Carnot cycle implemented using an ideal gas in a piston-cylinder system will have

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work transfer in two parts of the cycle and heat transfer in the other two parts of the cycle.

work transfer in all four parts of the cycle and heat transfer in two parts of the cycle.

work transfer in two parts of the cycle and heat transfer in all four parts of the cycle.

work transfer in all four parts of the cycle and heat transfer in all four parts of the cycle.

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The “degrees of freedom” for a pure substance at its triple point is

Your answerChoose one option.

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The differential of the Gibbs function (

) for a simple compressible system can be represented as

. Using the appropriate Maxwell relation derived from the above equation, the quantity,

for an ideal gas is

Your answerChoose one option.

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A Carnot engine receives 200 kJ heat from a source at 1200 K and rejects 500 kJ heat to sink. The sink temperature (K) is ________.

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A closed vessel contains a pure substance with 0.1 m

of saturated liquid and 0.9 m

of saturated vapor. The specific volume of the liquid and vapor phases are 0.00843 m

/kg and 0.02671 m

/kg respectively. The percentage of vapor in the mixture on mass basis (rounded off to two decimal places) is ________.

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A gas obeys the van der Waals equation of state

, where

and

are van der Waals constants. The compressibility factor

in the limit of high specific volume (

) is

Your answerChoose one option.

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Consider the thermodynamic relation

. For a certain gas, if the isobaric thermal expansion coefficient,

(where

is the temperature measured in K), then the value of

Your answerChoose one option.

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A piston-cylinder system has an initial volume of 0.1 m

and contains an ideal gas (

) at 1.5 bar and 298 K. The piston is moved to compress the gas until the pressure and temperature reach 10 bar and 423 K respectively. During this process, 20 kJ of work is done on the gas. The magnitude of heat transfer (kJ) during this process is

Your answerChoose one option.

134.8

36.2

8.2

3.8

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A reversible cycle device absorbs 400 kJ/s heat from a reservoir maintained at 265 K and rejects heat to another reservoir at 298 K. The magnitude of the rate of work done (kW) by the device is

Your answerChoose one option.

849.81

449.81

355.70

49.81

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GATE XE year:2019 PYQs

Question 4

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Question 8

Question 9

Question 10

Question 11

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Question 13