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Friday, 9 October

JEE Main Physics · Thermodynamics

Carnot Efficiency Limit

Carnot Efficiency Limit (Thermodynamics) was asked 4 times in 4 JEE Main shifts, 2021–2023, out of the 42 shifts Lumi analysed. 1 of the 4 had a numerical answer.

Times asked
4
in 4 shifts
Years
2021–2023
Usual format
Single correct
Calculation
Pattern
Comes in cycles
repeats across shifts

How it is asked

  • Sink temperature from efficiency
  • Heat input from carnot work and temperatures

Difficulty

Easy 2Medium 2Hard 0

Where it sits

Chapter: Thermodynamics. Topic: Heat Engines and Refrigerators, 6 questions over 3 ideas.

Every time it came

All 4 questions

Newest first, each with its options and official answer.

  1. 8 Apr 2023, Shift 2 · Q34Work done by a Carnot engine operating between temperatures 127∘127^\circC and 27∘27^\circC is 2 kJ. The amount of heat transferred to the…EasySingle correct
  2. 28 Jul 2022, Shift 1 · Q37A Carnot engine has efficiency of 50%. If the temperature of sink is reduced by 40∘40^\circC, its efficiency increases by 30%. The…MediumSingle correct
  3. 24 Jun 2022, Shift 1 · Q47A Carnot engine whose heat sinks at 27∘27^\circC, has an efficiency of 25%. By how many degrees should the temperature of the source be…MediumSingle correct
  4. 16 Mar 2021, Shift 2 · Q26For an ideal heat engine, the temperature of the source is 127∘127^\circC. In order to have 60% efficiency the temperature of the sink…EasyNumerical value