GATE XE format:mcq PYQs & Answers — Page 24

Questions 231–240 of 959. Imported answers require independent review unless marked reviewed.

Two identical rigid slender bars of length

and mass

are acted upon by a transverse force F at one of the ends as shown in the figure. In the first case, the bar is pinned at the other end. In the second case, the bar is pinned at its mid-point. What should be the magnitude of the force F such that the resulting angular accelerations of the two bars are equal?

Diagram for Engineering Sciences question 78

Your answerChoose one option.

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A heat source at temperature

transfers the same amount of heat to a sink under the following situations:

Case A: Sink is at temperature

Case B: Sink is at temperature

, which one of the following statements is TRUE?

Your answerChoose one option.

The reversibility is the same, and the entropy generation is greater than zero for Cases A and B

Case B is less reversible with the entropy generation greater than zero

Case B is more reversible with the entropy generation greater than zero

Case B is more reversible with the entropy generation equal to zero

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Given

is the molar specific volume,

is the pressure,

is the temperature,

is the Universal gas constant, and

are van der Waal’s constants.

The van der Waal’s equation of state is

The value of

Your answerChoose one option.

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The temperature of 10 g of liquid water (

J/g.K) in an insulated container is raised by 5 K by stirring. The amount of heat transferred to the water (in J) is

Your answerChoose one option.

210

420

105

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The figure shows four different processes labeled 1, 2, 3, and 4 for the same closed system containing an ideal gas. The curves labeled

, and

are isotherms. For which one of the four processes, the magnitude of internal energy change is the highest?

Diagram for Engineering Sciences question 91

Your answerChoose one option.

Process 1

Process 2

Process 3

Process 4

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A power plant operates on a simple ideal Rankine cycle. If superheating is added to this cycle, then which one of the following options is CORRECT?

Your answerChoose one option.

Pump work increases, turbine work output increases, cycle efficiency increases, and moisture content at turbine exit increases

Pump work remains same, turbine work output increases, cycle efficiency increases, and moisture content at turbine exit increases

Pump work remains same, turbine work output increases, cycle efficiency increases, and moisture content at turbine exit decreases

Pump work decreases, turbine work output increases, cycle efficiency increases, and moisture content at turbine exit decreases

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A fixed mass of an ideal gas undergoes two different cycles M and N as shown in the Pressure (

) – Volume (

) diagrams. Based on the information provided, which one of the following statements is always TRUE?

Diagram for Engineering Sciences question 97

Your answerChoose one option.

Heat input in Cycle M is equal to heat input in Cycle N

Heat rejected in Cycle M is equal to heat rejected in Cycle N

Net heat transfer in Cycle M is equal to net heat transfer in Cycle N

Thermal efficiency of Cycle M is equal to thermal efficiency of Cycle N

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In a graph with Helmholtz function on the

-axis and volume on the

-axis, the slope of the isotherm curves for a finite volume system containing an ideal gas is

Your answerChoose one option.

always zero

infinite

finite, positive, and non-zero

finite, negative, and non-zero

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Match each quantity in Column M with the appropriate relation from Column N. Here,

is Helmholtz function,

is pressure,

is specific volume,

is temperature,

is specific enthalpy, and

is specific entropy.

Column M: (M1)

; (M2)

; (M3)

; (M4)

Column N: (N1)

; (N2)

; (N3)

; (N4)

; (N5)

; (N6)

; (N7)

; (N8)

Your answerChoose one option.

M1-N5, M2-N1, M3-N4, M4-N7

M1-N6, M2-N2, M3-N3, M4-N8

M1-N5, M2-N1, M3-N4, M4-N8

M1-N8, M2-N1, M3-N4, M4-N5

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10 kg of water at 300 K is poured into a bucket containing 10 kg of water at 350 K. Heat capacity of water is 4.2 kJ/kg.K. Neglecting any heat losses to the surroundings, the change in the entropy (in kJ/K) of the system during this process (rounded off to two decimal places) is

Your answerChoose one option.

0.00

0.25

0.50

0.75

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GATE XE format:mcq PYQs

Question 78

Question 88

Question 89

Question 90

Question 91

Question 92

Question 97

Question 98

Question 99

Question 100