A carnot engine having an efficiency of $\frac{1}{10}$th 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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A refrigerator works between 4°C and 30°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)

(1)23.65W

(2)236.5W

(3)2365W

(4)2.365W

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
72%
From NCERT
NEET - 2016
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The temperature inside a refrigerator (reversible process) is t2oC and the room temperature is t1oC. The amount of heat delivered to the room for each joule of electrical energy consumed, ideally, will be:

1.  $\frac{{t}_{1}}{{t}_{1}-{t}_{2}}$

2.  $\frac{{t}_{1}+273}{{t}_{1}-{t}_{2}}$

3.  $\frac{{t}_{2}+273}{{t}_{1}+{t}_{2}}$

4.  $\frac{{t}_{1}+{t}_{2}}{{t}_{1}+273}$

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
68%
From NCERT
NEET - 2016
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A Carnot 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 a lower temperature is:
1. $$90$$ J
2. $$99$$ J
3. $$100$$ J
4. $$1$$ J

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
57%
From NCERT
NEET - 2017
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A refrigerator works between ${4}^{0}C$ and ${30}^{0}C$. It is required to remove 600 calories of heat every second to keep the temperature of the refrigerated space constant. The power required will be:
(Take, 1 cal= 4.2 Joules)
1. 23.65 W
2. 236.5 W
3. 2365 W
4. 2.365 W
Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
74%
From NCERT
NEET - 2016
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The coefficient of performance of a refrigerator is $$5.$$ If the temperature inside the freezer is $$-20^\circ \text{C},$$ the temperature of the surroundings to which it rejects heat is:
1. $$31^\circ \text{C}$$
2. $$41^\circ \text{C}$$
3. $$11^\circ \text{C}$$
4. $$21^\circ \text{C}$$

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
62%
From NCERT
NEET - 2015
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A Carnot engine, having an efficiency of $\mathrm{\eta }$$\frac{1}{10}$ as a heat engine, is used as a refrigerator. If the work done on the system is $$10$$ J, the amount of energy absorbed from the reservoir at a lower temperature is:
1. $$100$$ J
2. $$99$$ J
3. $$90$$ J
4. $$1$$ J

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
73%
From NCERT
NEET - 2015
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An engine has an efficiency of $\frac{1}{6}$. When the temperature of the sink is reduced by ${62}^{0}C$, its efficiency is doubled. the temperature of the source is:

1. 124oC

2. 37oC

3. 62oC

4. 99oC

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
56%
From NCERT
AIPMT - 2007
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An ideal refrigerator has a freezer at a temperature of –13°C . The coefficient of performance of the engine is 5. The temperature of the air (at which heat is rejected) will be
1. 325°C
2. 325K
3. 39°C
4. 320°C

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
70%
From NCERT
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The coefficient of performance of an ideal refrigerator is 3 which extracts heat from the sink at the rate of 399 J per cycle. The amount of heat it gives to the room per cycle will be:

1 532 J

2 250 J

3 300 J

4 496 J

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
75%
From NCERT
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