1
AP EAPCET 2022 - 4th July Evening Shift
+1
-0

The temperature of the sink of a Carnot engine is 250 K . In order to increase the efficiency of the Carnot engine from $$25 \%$$ to $$50 \%$$, the temperature of the sink should be increased by

A
$$\frac{1}{3} \times 10^3 \mathrm{~K}$$
B
$$\frac{1}{2} \times 10^3 \mathrm{~K}$$
C
200 K
D
$$\frac{1}{6} \times 10^3 \mathrm{~K}$$
2
AP EAPCET 2022 - 4th July Evening Shift
+1
-0

In non-rigid diatomic molecule with an additional vibrational mode

A
$$81 C_V^2=49 C_p^2$$
B
$$49 C_V^2=25 C_p^2$$
C
$$49 C_V^2=81 C_p^2$$
D
$$25 C_V^2=49 C_p^2$$
3
AP EAPCET 2022 - 4th July Morning Shift
+1
-0

A sphere of surface area $$4 \mathrm{~m}^2$$ at temperature 400 K and having emissivity 0.5 is located in an environment of temperature 200 K. The net rate of energy exchange of the sphere is (Stefan Boltzmann constant, $$\sigma=5.67 \times 10^{-8} \mathrm{Wm}^{-2} \mathrm{~K}^4)$$

A
3260.8 W
B
1632.4 W
C
2721.6 W
D
4216.4 W
4
AP EAPCET 2022 - 4th July Morning Shift
+1
-0

A Carnot engine operates between a source and a sink. The efficiency of the engine is $$40 \%$$ and the temperature of the sink is $$27^{\circ} \mathrm{C}$$. If the efficiency is to be increased to $$50 \%$$, then the temperature of the source must be increased by

A
80 K
B
120 K
C
100 K
D
160 K
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