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#55 | Solved Example: 25
(Physics) > Thermodynamics
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Related Practice Questions :

A Carnot engine working between 400K and 800K has a work output of 900J per cycle. The amount of heat energy supplied to engine from the source per cycle is

1.  900 J

2.  1800 J

3.  450 J

4.  2700 J

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Difficulty Level:

A carnot engine having an efficiency of $\frac{1}{10}$th of 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 -

(a) 1 J

(b) 90 J

(c) 99 J

(d) 100 J

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Difficulty Level:

The temperature inside a refrigerator is and the room temperature is . The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be -

(a)$\frac{{t}_{1}}{{t}_{1}-{t}_{2}}$      (b) $\frac{{t}_{1}+273}{{t}_{1}-{t}_{2}}$

(c) $\frac{{t}_{2}+273}{{t}_{1}-{t}_{2}}$    (d) $\frac{{t}_{1}+{t}_{2}}{{t}_{1}+273}$

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Difficulty Level:

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)

(a)23.65W
(b)236.5W
(c)2365W
(d)2.365W

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Difficulty Level:

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  -

(a)31°C

(b)41°C

(c)11°C

(d)21°C