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Thermodynamics
Calculation of Work and Heat
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Entropy and Irreversibility
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Properties of Pure Substances
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Basic Concepts and Zeroth Law
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First Law of Thermodynamics
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Rankine Cycle
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Availability
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Second Law of Thermodynamics
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1
GATE ME 2025
MCQ (Single Correct Answer)
+1
-0.33

Air inside a rigid, thermally-insulated tank undergoes stirring as shown in the figure below. Which one of the following options is correct?

GATE ME 2025 Thermodynamics - Second Law of Thermodynamics Question 2 English
A
The enthalpy of the air increases while the entropy of the air remains constant
B
Both the enthalpy and the entropy of the air remain constant
C
Both the enthalpy and the entropy of the air increase
D
The enthalpy of the air decreases while the entropy of the air increases
2
GATE ME 2025
Numerical
+1
-0
The thermal efficiency of an ideal air-standard Otto cycle is 0.5 . The value of specific heat ratio of air is 1.4. The compression ratio of the cycle is _________ (rounded off to 1 decimal place).
Your input ____
3
GATE ME 2024
MCQ (Single Correct Answer)
+1
-0.33

A furnace can supply heat steadily at 1200 K at a rate of 24000 kJ/min. The maximum amount of power (in kW) that can be produced by using the heat supplied by this furnace in an environment at 300 K is

A

300

B

150

C

18000

D

0

4
GATE ME 2023
MCQ (Single Correct Answer)
+1
-0.33
A heat engine extracts heat (𝑄H) from a thermal reservoir at a temperature of 1000 K and rejects heat (𝑄L) to a thermal reservoir at a temperature of 100 K, while producing work (𝑊). Which one of the combinations of [𝑄H, 𝑄L and 𝑊] given is allowed? 
A
𝑄H = 2000 J, 𝑄L = 500 J, 𝑊 = 1000 J 
B
𝑄H = 2000 J, 𝑄L = 750 J, 𝑊 = 1250 J
C
𝑄H = 6000 J, 𝑄L = 500 J, 𝑊 = 5500 J
D
𝑄H = 6000 J, 𝑄L = 600 J, 𝑊 = 5500 J
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GATE ME Subjects
Engineering Mechanics
Machine Design
Strength of Materials
Heat Transfer
Production Engineering
Industrial Engineering
Turbo Machinery
Theory of Machines
Engineering Mathematics
Fluid Mechanics
Thermodynamics
General Aptitude