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Thermodynamics

Multiple Choice Questions

311.
For which combination of working temperatures, the efficiency of engine is the least ?

100 K, 80 K

40 K, 20 K

80 K, 60 K

60 K, 40 K

100 K, 80 K

We know that,

$η = (1 - \frac{T_{L}}{T_{H}}) \times 100$

According to trial and error method

$η = (1 - \frac{80}{100}) \times 100 η = (\frac{100 - 80}{100}) \times 100 η = \frac{20}{100} \times 100 η = 20 %$

Thus, the Carnot engine working on the combination given in option (a) has the least efficiency.

∴ Temperatures will be 100 K and 80 K.

312.

A Carnot's engine is made to work between 200°C and 0°C first and then between 0°C and − 200°C. The ratio of efficiencies of the engine in the two cases is

1 : 1.73
1.73 : 1
1 : 2
1 : 1

Previous Year Papers

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Test Yourself

Multiple Choice Questions

311. For which combination of working temperatures, the efficiency of engine is the least ? 100 K, 80 K 40 K, 20 K 80 K, 60 K 60 K, 40 K

311.
For which combination of working temperatures, the efficiency of engine is the least ?

100 K, 80 K

40 K, 20 K

80 K, 60 K

60 K, 40 K