1
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Carnot cycle of an engine is given below

COMEDK 2021 Physics - Heat and Thermodynamics Question 35 English

Total work done by the gas in one cycle is

A
$$\mu R{T_2}\log {{{V_2}} \over {{V_1}}} - \mu R{T_1}\log {{{V_3}} \over {{V_4}}}$$
B
$$\mu R{T_1}\log {{{V_2}} \over {{V_1}}} - \mu R{T_2}\log {{{V_3}} \over {{V_4}}}$$
C
$$\mu R{T_1}\log {{{V_2}} \over {{V_1}}} + \mu R{T_2}\log {{{V_3}} \over {{V_4}}}$$
D
Zero
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A compound slab is made of two parallel plates of copper and brass of the same thickness and having thermal conductivities in the ratio 4 : 1. The free face of copper is at 0$$^\circ$$C. The temperature of the interface is 20$$^\circ$$C. What is the temperature of the free face of brass?

A
0$$^\circ$$C
B
20$$^\circ$$C
C
40$$^\circ$$C
D
100$$^\circ$$C
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

In mm$$^3$$ of a gas is compressed at 1 atmospheric pressure and temperature 27$$^\circ$$C to 627$$^\circ$$C. What is the final pressure under adiabatic condition?

($$\gamma$$ for the gas = 1.5)

A
$$27\times10^5$$ N/m$$^2$$
B
$$80\times10^5$$ N/m$$^2$$
C
$$36\times10^5$$ N/m$$^2$$
D
$$56\times10^5$$ N/m$$^2$$
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

If sink is at a temperature of $$-39\Upsilon$$C and source at 0$$^\circ$$C, then efficiency will be

A
39.4%
B
14.2%
C
35.2%
D
45.5%
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