Q. In an ideal gas, what happens to the internal energy when the temperature increases?
-
A.
It decreases
-
B.
It remains constant
-
C.
It increases
-
D.
It becomes zero
Solution
In an ideal gas, the internal energy increases with an increase in temperature.
Correct Answer:
C
— It increases
Learn More →
Q. In heat transfer, what is conduction?
-
A.
Transfer of heat through fluid motion
-
B.
Transfer of heat through electromagnetic waves
-
C.
Transfer of heat through direct contact
-
D.
Transfer of heat through phase change
Solution
Conduction is the transfer of heat through direct contact between materials.
Correct Answer:
C
— Transfer of heat through direct contact
Learn More →
Q. What does the second law of thermodynamics state?
-
A.
Energy is conserved
-
B.
Heat cannot flow from cold to hot spontaneously
-
C.
Entropy of the universe tends to increase
-
D.
All processes are reversible
Solution
The second law of thermodynamics states that the entropy of the universe tends to increase, indicating the direction of spontaneous processes.
Correct Answer:
C
— Entropy of the universe tends to increase
Learn More →
Q. What is the primary function of a heat exchanger?
-
A.
To store heat
-
B.
To transfer heat between two or more fluids
-
C.
To generate electricity
-
D.
To cool a fluid
Solution
The primary function of a heat exchanger is to transfer heat between two or more fluids without mixing them.
Correct Answer:
B
— To transfer heat between two or more fluids
Learn More →
Q. What is the significance of the Carnot efficiency?
-
A.
It is the maximum possible efficiency of a heat engine
-
B.
It is the minimum efficiency of any engine
-
C.
It applies only to refrigeration cycles
-
D.
It is the efficiency of real engines
Solution
The Carnot efficiency represents the maximum possible efficiency of a heat engine operating between two temperatures.
Correct Answer:
A
— It is the maximum possible efficiency of a heat engine
Learn More →
Showing 1 to 5 of 5 (1 Pages)
