GATE XE 2021 Paper 1 — page 34

Complete GATE XE 2021 Paper 1 overview, original pages and practice · Timed previous-paper practice

Questions 100–102 of 175. Imported answers require review unless explicitly marked reviewed.

Paper practice 175 questionsPage 34 of 59

Four different Entropy (S) - Temperature (T) diagrams, representing liquid to vapour phase transition process of a pure substance in a closed system under constant pressure are shown. The diagram, which correctly represents the process, is:

Your answerChoose one option.

Diagram for Engineering Sciences question 13

Diagram for Engineering Sciences question 13 (figure 2)

Diagram for Engineering Sciences question 13 (figure 3)

Diagram for Engineering Sciences question 13 (figure 4)

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Air having a mass flow rate of 2 kg/s enters a diffuser at 100 kPa and 30°C, with a velocity of 200 m/s. Exit area of the diffuser is 400 cm² while the exit temperature of the air is 45°C. The rate of heat loss from the diffuser to the surrounding is 8 kJ/s. The pressure at the diffuser exit is __________ kPa (2 decimal places).

For air, the characteristic gas constant is 287 J/(kgK) and specific heat capacity at constant pressure is 1005 J/(kgK). Assume air to be an ideal gas and the flow in the diffuser is steady.

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For the Refrigerant R-134 (at 1 MPa and 50°C), the difference between the specific volume computed by assuming it to be an ideal gas and its actual specific volume is:

. If the compressibility factor associated with this state is

, then

__________

m³/kg (3 decimal places).

Here

is the specific volume calculated using the compressibility factor.

For Refrigerant R-134 (at 1 MPa and 50°C): The characteristic gas constant: 0.0815 kJ/(kgK), The critical pressure and temperature are, respectively,

MPa and

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2021 · Paper 1

Question 13

Question 14

Question 15