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Thermodynamics (Physics) · Question 53

AIPMT 2002MCQEasy📈 Topic in 12% papers+4−1
1

The efficiency of Carnot engine is 50\% and temperature of sink is 500 K. If temperature of source is kept constant and its efficiency raised to 60\%, then the required temperature of sink will be

  1. 100 K
  2. 600 K
  3. 400 K
  4. 500 K

Answer

(3) 400 K

Solution

Efficiency of a Carnot engine: = 1 - T2T1

0.5 = 1 - 500T1 T1 = 1000 K

For ' = 0.6: 0.6 = 1 - T2'1000

T2' = 400 K

Answer: (3)

AIPMT 2002

Keep practising — Thermodynamics (Physics)

2

A scientist says that the efficiency of his heat engine which works at source temperature 127 and sink temperature 27 is 26\%, then

  1. it is impossible
  2. it is possible but less probable
  3. it is quite probable
  4. data are incomplete.
AIPMT 2001
3

The (W/Q) of a Carnot engine is 16, now the temperature of sink is reduced by 62 , then this ratio becomes twice, therefore the initial temperature of the sink and source are respectively

  1. 33 , 67
  2. 37 , 99
  3. 67 , 33
  4. 97 K, 37 K
AIPMT 2000

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