JEE-MAIN SERIES Physics
Carnot Cycle
6 previous year questions.
Volume: 6 Ques
Yield: Medium
High-Yield Trend
1
2023 4
2022 1
2019 Chapter Questions 6 MCQs
01
PYQ 2019
medium
physics ID: jee-main
Three Carnot engines operate in series between a heat source at a temperature and a heat sink at temperature (see figure). There are two other reservoirs at temperature , and , as shown, with . The three engines are equally efficient if:
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02
PYQ 2022
hard
physics ID: jee-main
A Carnot engine has efficiency of .If the temperature of sink is reduced by , its efficiency increases by .The temperature of the source will be :
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3
4
03
PYQ 2022
medium
physics ID: jee-main
In 1st case, Carnot engine operates between temperatures 300 K and 100 K. In 2nd case, as shown in the figure, a combination of two engines is used. The efficiency of this combination (in 2nd case) will be:
1
Same as the 1st case
2
Always greater than the 1st case
3
Always less than the 1st case
4
May increase or decrease with respect to the 1st case
04
PYQ 2022
medium
physics ID: jee-main
A Carnot engine whose heat sinks at 27°C, has an efficiency of 25%. By how many degrees should the temperature of the source be changed to increase the efficiency by 100% of the original efficiency?
1
Increases by 18°C
2
Increases by 200°C
3
Increases by 120°C
4
Increases by 73°C
05
PYQ 2022
medium
physics ID: jee-main
A geyser heats water flowing at a rate of 2.0 kg per minute from 30°C to 70°C. If geyser operates on a gas burner, the rate of combustion of fuel will be __________ g min–1.
[Heat of combustion = 8 \times 103 Jg–1, Specific heat of water = 4.2 Jg–1 °C–1]
[Heat of combustion = 8 \times 103 Jg–1, Specific heat of water = 4.2 Jg–1 °C–1]
06
PYQ 2023
medium
physics ID: jee-main
A Carnot engine operating between two reservoirs has efficiency When the temperature of cold reservoir raised by , its efficiency decreases to The value of , if the temperature of hot reservoir is , will be :
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