A carnot engine having an efficiency of 110th of heat engine, is used as a refrigerator. If then work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is:

1. 1 J

2. 90 J

3. 99 J

4. 100 J 

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 61%
From NCERT
NEET - 2017
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The temperature inside a refrigerator is t2C and the room temperature is t1C. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be:

1. t1t1-t2

2.  t1+273t1-t2

3. t2+273t1+t2

4.  t1+t2t1+273

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 59%
From NCERT
NEET - 2016
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The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is -20°C, the temperature of the surroundings to which it rejects heat is  -

1. 31°C

2. 41°C

3. 11°C

4. 21°C

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 58%
From NCERT
NEET - 2015
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A Carnot engine working between 300 K and 600K has work output of 800 J per cycle. What is amount of heat energy supplied to the engine from source per cycle ?

(1) 1800 J/cycle

(2) 1000 J/cycle

(3) 2000 J/cycle

(4) 1600 J/cycle

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 82%
From NCERT
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A Carnot's engine used first an ideal monoatomic gas then an ideal diatomic gas. If the source and sink temperature are 411°C and 69°C respectively and the engine extracts 1000 J of heat in each cycle, then area enclosed by the PV diagram is -

(1) 100 J

(2) 300 J

(3) 500 J

(4) 700 J

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 79%
From NCERT
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The temperature of sink of Carnot engine is 27°C. Efficiency of engine is 25%. Then temperature of source is -

(1) 227°C

(2) 327°C

(3) 127°C

(4) 27°C

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 82%
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The temperature of reservoir of Carnot's engine operating with an efficiency of 70% is 1000K. The temperature of its sink is -

(1) 300 K

(2) 400 K

(3) 500 K

(4) 700 K

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 86%
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The efficiency of Carnot's engine operating between reservoirs, maintained at temperatures 27°C and –123°C, is 

(1) 50%

(2) 24%

(3) 0.75%

(4) 0.4%

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
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A Carnot engine operates between 227°C and 27°C . Efficiency of the engine will be -

(1) 13

(2) 25

(3) 34

(4) 35

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 88%
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Efficiency of a Carnot engine is 50% when temperature of outlet is 500 K. In order to increase efficiency up to 60% keeping temperature of intake the same what is temperature of outlet ?

(1) 200 K

(2) 400 K

(3) 600 K

(4) 800 K

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 76%
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