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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 (๐‘„H) from a thermal reservoir at a temperature of 1000 K and rejects heat (๐‘„L) to a thermal reservoir at a temperature of 100 K, while producing work (๐‘Š). Which one of the combinations of [๐‘„H, ๐‘„L and ๐‘Š] given is allowed? 
A
๐‘„H = 2000 J, ๐‘„L = 500 J, ๐‘Š = 1000 J 
B
๐‘„H = 2000 J, ๐‘„L = 750 J, ๐‘Š = 1250 J
C
๐‘„H = 6000 J, ๐‘„L = 500 J, ๐‘Š = 5500 J
D
๐‘„H = 6000 J, ๐‘„L = 600 J, ๐‘Š = 5500 J
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