Question 294: Thermodynamics & KTG

Question

Given below are two statements: one is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason $\mathbf{R}$
Assertion A: Efficiency of a reversible heat engine will be highest at $-273^{\circ} \mathrm{C}$ temperature of cold reservoir.

Reason R: The efficiency of Carnot's engine depends not only on the temperature of the cold reservoir but it depends on the temperature of the hot reservoir too and is given as $\eta=\left(1-\frac{T_{2}}{T_{1}}\right)$

In the light of the above statements, choose the correct answer from the options given below

Accepted Answer

$$\eta  = 1 - {{{T_{\mathrm{cold}}}} \over {{T_{\mathrm{hot}}}}}$$
$${T_{\mathrm{cold}}} = \mathrm{OK} \Rightarrow \eta  = 1$$ (max)
A is correct.
R is also correct and explains A.

Answer

Both $\mathbf{A}$ and $\mathbf{R}$ are true and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$

Answer

Both $\mathbf{A}$ and $\mathbf{R}$ are true but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$

Answer

A is false but $\mathbf{R}$ is true

Answer

A is true but $\mathbf{R}$ is false

Thermodynamics & KTG

Choose the correct answer: