Q. In a Carnot cycle, what is the efficiency dependent on?
A.
The work done by the system
B.
The temperatures of the hot and cold reservoirs
C.
The type of working fluid
D.
The pressure of the system
Solution
The efficiency of a Carnot cycle is given by the formula η = 1 - (T_c/T_h), where T_c is the temperature of the cold reservoir and T_h is the temperature of the hot reservoir.
Correct Answer:
B
— The temperatures of the hot and cold reservoirs
Q. In a Carnot cycle, what is the efficiency formula?
A.
1 - (T_c/T_h)
B.
T_h/T_c
C.
T_c/T_h
D.
1 + (T_c/T_h)
Solution
The efficiency of a Carnot cycle is given by the formula η = 1 - (T_c/T_h), where T_c is the temperature of the cold reservoir and T_h is the temperature of the hot reservoir.
Entropy is defined as a measure of disorder or randomness in a system, reflecting the number of microscopic configurations that correspond to a thermodynamic system's macroscopic state.
Correct Answer:
B
— A measure of disorder or randomness
Q. What is the efficiency of a Carnot engine operating between temperatures T_h and T_c?
A.
(T_h - T_c) / T_h
B.
1 - (T_c / T_h)
C.
T_c / T_h
D.
T_h / T_c
Solution
The efficiency of a Carnot engine is given by the formula 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 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 maximum efficiency of a Carnot engine operating between two temperatures?
A.
100%
B.
Depends on the working fluid
C.
1 - (T_c/T_h)
D.
1 - (T_h/T_c)
Solution
The maximum efficiency of a Carnot engine is given by the formula η = 1 - (T_c/T_h), where T_c is the cold reservoir temperature and T_h is the hot reservoir temperature.
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 second law of thermodynamics concerned with?
A.
Conservation of energy
B.
Direction of heat transfer
C.
Work done by a system
D.
Temperature changes
Solution
The second law of thermodynamics is concerned with the direction of heat transfer and the concept of entropy, stating that heat cannot spontaneously flow from a colder body to a hotter body.
Q. What is the second law of thermodynamics primarily concerned with?
A.
Conservation of energy
B.
Direction of heat transfer
C.
Work done by a system
D.
Temperature of a system
Solution
The second law of thermodynamics states that heat cannot spontaneously flow from a colder body to a hotter body, which defines the direction of heat transfer.
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.