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

2007 · Q142
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. /2007 · Q142

Heat and Thermodynamics question

2007 · Q142

NEETPhysicsHeat and ThermodynamicsMCQ+4 / −1
An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62oC, its efficiency is doubled. Temperatures of the source is
  1. A
    37oC
  2. B
    62oC
  3. C
    99oC
  4. D
    124oC.
View written solutionFree

Correct answer: C

Since efficiency of engine is η=1−T2T1\eta = 1 - {{{T_2}} \over {{T_1}}}η=1−T1​T2​​

According to problem,

16=1−T2T1{1 \over 6} = 1 - {{{T_2}} \over {{T_1}}}61​=1−T1​T2​​   ...(i)

When the temperature of the sink is reduced by 62°C, its efficiency is doubled

2(16)=1−T2−62T12\left( {{1 \over 6}} \right) = 1 - {{{T_2} - 62} \over {{T_1}}}2(61​)=1−T1​T2​−62​   ...(ii)

Solving (i) and (ii)
T2 = 372 K

T1 = 99°C = Temperature of source.

PreviousNext

More from Heat and Thermodynamics

  • A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased so as to increase its efficiency by 50% of original efficiency ?2006 · MCQ
  • The molar specific heat at constant pressure of an ideal gas is (7/2) R. The ratio of specific heat at constant pressure to that at constant volume is2006 · MCQ
  • An ideal gas heat engine operates in Carnot cycle between 227oC and 127oC. It absorbs 6 × 104 cal of heat at higher temperature. Amount of heat converted to work is2005 · MCQ
  • Which of the following processes is reversible?2005 · MCQ
  • The equation of state for 5 g of oxygen at a pressure P and temperature T, when occupying a volume V, will be (where R is the gas constant)2004 · MCQ
  • One mole of an ideal gas at an initial temperature of T K does 6R joule of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, the final temperature of gas will be2004 · MCQ
  • An ideal gas heat engine operates in a Carnot cycle between 227oC and 127oC. It absorbs 6 kcal at the height temperature. The amount of heat (in kcal) converted into work is equal to2003 · MCQ
  • 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 be2002 · MCQ