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A Carnot's reversible engine converts $\frac{1}{6}$ of heat input into work. When the temperature of the sink is reduced by $62 K$ , the efficiency of Carnot's cycle becomes $\frac{1}{3}$ . The temperature of the source and the sink, in kelvin, are respectively

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Important Questions on Thermodynamics

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

Three Carnot engines operate in series between a heat source at a temperature

T_{1}

and a heat sink at temperature

T_{4}

(see figure). There are two other reservoirs at temperature

T_{2}

and

T_{3},

as shown, with

T_{1} > T_{2} > T_{3} > T_{4} .

The three engines are equally efficient if:

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EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

The coefficient of performance of a refrigerator is

5

. If the temperature inside the freezer is

- 20 ° C

, the temperature of the surrounding to which it rejects heat is:

HARD

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

Two ideal Carnot engines operate in a cascade (all heat given up by one engine is used by the other engine to produce work) between temperatures,

T_{1}

and

T_{2}

. The temperature of the hot reservoir of the first engine is

T_{1}

and the temperature of the cold reservoir of the second engine is

T_{2}

T

is the temperature of the sink of the first engine which is also the source for the second engine. How is

T

related to

T_{1}

and

T_{2}

, if both the engines perform an equal amount of work?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

A refrigerator works between

4^{o} C

and

30^{o} C

. It is required to remove

600

calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is:

(Take

1

cal =

4 .2

Joules)

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

A Carnot's engine having an efficiency of

\frac{1}{10}

as heat engine, is used as a refrigerator. If the work done on the system is

10 J,

the amount of energy absorbed from the reservoir at lower temperature is

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

If minimum possible work is done by a refrigerator in converting 100 grams of water at

0 ° C

to ice, how much heat (in calories) is released to the surroundings at temperature

27 ° C

(Latent heat of ice

= 80 Cal / gram

) to the nearest integer?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

A Carnot engine having an efficiency of

\frac{1}{10}

is being used as a refrigerator. If the work done on the refrigerator is

10 J,

the amount of heat absorbed from the reservoir at a lower temperature is

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

Helium gas goes through a cycle $A B C D A$ (consisting of two isochoric and two isobaric lines) as shown in figure. The efficiency of this cycle is approximately

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MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

A Carnot freezer takes heat from water at

0^{o} C

inside it and rejects it to the room at a temperature of

27^{o} C .

The latent heat of ice is

336 \times 10^{3} J k g^{- 1} .

If 5kg of water at

0^{o} C

is converted into ice at

0^{o} C

by the freezer, then the energy consumed by the freezer is close to :

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

A Carnot engine operates between two reservoirs of temperatures

900 K

and

300 K

. The engine performs

1200 J

of work per cycle. The heat energy (in

J

) delivered by the engine to the low temperature reservoir, in a cycle, is _____________

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

An engine operates by taking a monatomic ideal gas through the cycle shown in the figure. The percentage efficiency of the engine is close to

Question Image

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

A Carnot engine, having an efficiency of

η = \frac{1}{10}

as heat engine, is used as a refrigerator. If the work done on the system is

10 J

, the amount of energy absorbed from the reservoir at a lower temperature is:

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

The efficiency of a Carnot engine depends upon

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

A heat engine is involved with exchange of heat of

1915 J, - 40 J, + 125 J

and

- Q J

, during one cycle achieving and efficiency of

50.0 %

. The value of

Q

is:

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

A reservoir is at

827 ° C

and Carnot's engine takes a thousand

kilo calorie

of heat from it and exhausts it to a sink at

27 ° C

. What is the amount of work and the efficiency of the engine?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

Two carnot engines

A

and

B

are connected in series in such a way that the work outputs are equal when the temperatures of hot and cold reservoirs of

A

are

800 K

and

T

, and of engine

B

are

T

and

300 K

, respectively. Then the temperature

T

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

An air conditioner

(A C)

removes heat at a rate of

1.2 kJ \sec^{- 1}

from a room. A power of

400 W

is required to run the

A C

. The coefficient of performance

(α)

of the

A C

10 %

of that of the refrigerator operating between outside and room temperature. If outside temperature is

37 ° C

, what will be room temperature?

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

A Carnot engine has an efficiency of

\frac{1}{6} .

When the temperature of the sink is reduced by

62 ℃

, its efficiency is doubled. The temperatures of the source and the sink are, respectively,

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

The temperature inside a refrigerator is

t_{2}^{o} C

and the room temperature is

t_{1}^{o} C

. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Carnot Engine

Two carnot engines

A

and

B

are operated in series. The first one,

A,

receives heat at

T_{1} (= 600 K)

and rejects to a reservoir at temperature

T_{2} .

The second engine

B

receives heat rejected by the first engine and, in turn, rejects to a heat reservoir at

T_{3} (= 400 K) .

Calculate the temperature

T_{2}

if the work outputs of the two engines are equal:

A Carnot's reversible engine converts 1 6 of heat input into work. When the temperature of the sink is reduced by 62 K, the efficiency of Carnot's cycle becomes 13. The temperature of the source and the sink, in kelvin, are respectively

Important Questions on Thermodynamics

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A Carnot's reversible engine converts $\frac{1}{6}$ of heat input into work. When the temperature of the sink is reduced by $62 K$ , the efficiency of Carnot's cycle becomes $\frac{1}{3}$ . The temperature of the source and the sink, in kelvin, are respectively