Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Heat and Thermodynamics question

2002 · Q166
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Heat and Thermodynamics
  5. /2002 · Q166

Heat and Thermodynamics question

2002 · Q166

NEETPhysicsHeat and ThermodynamicsMCQ+4 / −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. A
    100 K
  2. B
    600 K
  3. C
    400 K
  4. D
    500 K
View written solutionFree

Correct answer: C

Efficiency (η\etaη) of a carnot engine is given by η=1−T2T1\eta = 1 - {{{T_2}} \over {{T_1}}}η=1−T1​T2​​, where T1 is the temperature of the source and T2 is the temperature of the sink.

Here, T2 = 500 K

∴\therefore∴ 0.5=1−500T1⇒T1=1000K0.5 = 1 - {{500} \over {{T_1}}} \Rightarrow {T_1} = 1000K0.5=1−T1​500​⇒T1​=1000K

Now, η=0.6=1−T2′1000\eta = 0.6 = 1 - {{{T_2}'} \over {1000}}η=0.6=1−1000T2​′​ (T2' is the new sink temperature)

⇒T2′=400 K \Rightarrow {T_2}' = 400\,K⇒T2​′=400K

PreviousNext

More from Heat and Thermodynamics

  • A scientist says that the efficiency of his heat engine which work at source temperature 127oC and sink temperature 27oC is 26%, then2001 · MCQ
  • To find out degree of freedom, the expansion is2000 · MCQ
  • The (W/Q) of a Carnot engine is 1/6, now the temperature of sink is reduced by 62oC, then this ratio becomes twice, therefore the initial temperature of the sink and source are respectively2000 · MCQ
  • Three identical heat conducting rods are connected in series as shown in the figure. The rods on the sides have thermal conductivity 2K while that in the middle has thermal conductivity K. The left end of the combination is maintained… Includes diagram2025 · MCQ
  • A container has two chambers of volumes V1​=2 litres and V2​=3 litres separated by a partition made of a thermal insulator. The chambers contain n1​=5 and n2​=4 moles of ideal gas at pressures p1​=1 atm and p2​=2 atm…2025 · MCQ
  • An oxygen cylinder of volume 30 litre has 18.20 moles of oxygen. After some oxygen is withdrawn from the cylinder, its gauge pressure drops to 11 atmospheric pressures at temperature 27∘C. The mass of the oxygen…2025 · MCQ
  • Two gases A and B are filled at the same pressure in separate cylinders with movable pistons of radius rA​ and rB​, respectively. On supplying an equal amount of heat to both the systems reversibly under constant pressure, the…2025 · MCQ
  • A thermodynamic system is taken through the cycle abcda. The work done by the gas along the path bc is: Includes diagram2024 · MCQ