GATE XE discipline:engineering-sciences PYQs & Answers — Page 47

Questions 461–470 of 1772. Imported answers require independent review unless marked reviewed.

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.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A closed system containing an unknown substance undergoes an adiabatic process governed by the relation

, where

is pressure,

is volume, and

is the ratio of specific heats. For this scenario, which of the following statements is/are always TRUE?

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

The substance is an ideal gas and process is reversible

The substance is a liquid and process is reversible

The substance is a non-ideal gas and process is reversible

The substance is an ideal gas and process is NOT reversible

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Two rigid, impermeable containers

and

are filled with an ideal gas. They are allowed to exchange heat only with each other and not with the surroundings.

, and

represent the pressure, total volume, number of moles, and temperature, respectively. At equilibrium, which of the following conditions is/are necessarily satisfied?

(Subscripts

and

represent properties of the gas in the respective containers.)

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Following data is for an actual vapour compression refrigeration cycle.

Enthalpy at compressor inlet: 246 kJ/kg

Enthalpy at compressor exit: 286 kJ/kg

Heat load on the evaporator: 158 kJ/kg

The enthalpy at the exit of the condenser in kJ/kg is ________ (rounded off to the nearest integer).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A rigid tank, initially at 1 bar and 300 K, contains 5 moles of

, 4 moles of

, and 3 moles of

. From this tank, 2 moles of

are removed keeping the temperature constant. Assuming ideal gas behavior, the final partial pressure of

(in bar) inside the tank is ________ (rounded off to three decimal places).

Use

J/mol.K

Molecular weights of

and

are 2 g/mol, 28 g/mol, and 32 g/mol respectively.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE XE discipline:engineering-sciences PYQs

Question 89

Question 90

Question 91

Question 92

Question 93

Question 94

Question 95

Question 96

Question 97

Question 98