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Thermodynamics

Question

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The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is

26.8%

20%

12.5%

6.25%

Solution

A.

26.8%

Efficiency of ideal heat engine,

$η = (1 - \frac{T_{2}}{T_{1}})$

Sink temperature, T₂ = 100^oC = 100 + 273 = 373 K
Source temperature, T₁ = 0^o C = 0 + 273 = 273 K

Percentage efficiency,

$% η = (1 - \frac{T_{2}}{T_{1}}) x 100 = (1 - \frac{273}{373}) x 100 - (\frac{100}{373}) x 100 = 26.8 %$

Some More Questions From Thermodynamics Chapter

A system goes from A to B via two processes I and II as shown in the figure. If ∆U₁ and ∆U₂ are the changes in internal energies in the processes I and II respectively, the

Which of the following statements is correct for any thermodynamic system?

Thermodynamic processes are indicated in the following diagram.

Match the following

Column-1 Column-2
P. Process I a. Adiabatic
Q. Process II b. Isobaric
R. Process III c. Isochoric
S. Process IV d. Isothermal

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