Q. What is the maximum efficiency of a Carnot engine operating between two heat reservoirs at temperatures T_H and T_C?
A.
1 - T_C/T_H
B.
T_H/T_C
C.
T_H - T_C
D.
T_C/T_H
Solution
The efficiency of a Carnot engine is given by the formula η = 1 - (T_C/T_H), where T_H is the temperature of the hot reservoir and T_C is the temperature of the cold reservoir.
Q. What is the relationship between heat transfer and temperature difference in heat transfer basics?
A.
Heat transfer is independent of temperature difference.
B.
Heat transfer increases with temperature difference.
C.
Heat transfer decreases with temperature difference.
D.
Heat transfer is constant regardless of temperature difference.
Solution
In heat transfer basics, the rate of heat transfer is directly proportional to the temperature difference between two bodies, as described by Fourier's law.
Correct Answer:
B
— Heat transfer increases with temperature difference.
Q. What is the significance of the Carnot cycle in thermodynamics?
A.
It is the most efficient cycle possible.
B.
It is a practical engine design.
C.
It operates at constant pressure.
D.
It uses a real gas.
Solution
The Carnot cycle is significant because it represents the maximum possible efficiency that any heat engine can achieve operating between two temperatures.
Correct Answer:
A
— It is the most efficient cycle possible.
