Q. According to Bernoulli's principle, what happens to the pressure of a fluid as its velocity increases?
A.
Pressure increases
B.
Pressure decreases
C.
Pressure remains constant
D.
Pressure fluctuates
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Solution
According to Bernoulli's principle, as the velocity of a fluid increases, the pressure within the fluid decreases.
Correct Answer:
B
— Pressure decreases
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Q. In a Carnot cycle, what is the relationship between the temperatures of the hot and cold reservoirs?
A.
T_hot > T_cold
B.
T_hot = T_cold
C.
T_hot < T_cold
D.
T_hot + T_cold = constant
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Solution
In a Carnot cycle, the hot reservoir must be at a higher temperature than the cold reservoir for the cycle to operate.
Correct Answer:
A
— T_hot > T_cold
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Q. In a Rankine cycle, what is the working fluid typically used?
A.
Air
B.
Water
C.
Refrigerant
D.
Helium
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Solution
The working fluid in a Rankine cycle is typically water, which is used to convert heat into work.
Correct Answer:
B
— Water
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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
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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.
Correct Answer:
B
— 1 - (T_c / T_h)
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Q. What is the primary purpose of a heat exchanger?
A.
To increase temperature
B.
To transfer heat between two fluids
C.
To convert heat to work
D.
To store thermal energy
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Solution
The primary purpose of a heat exchanger is to transfer heat between two fluids without mixing them.
Correct Answer:
B
— To transfer heat between two fluids
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Q. Which of the following statements is true regarding heat transfer?
A.
Heat flows from cold to hot spontaneously
B.
Heat transfer requires a medium
C.
Heat can be transferred by conduction, convection, and radiation
D.
Heat transfer is always efficient
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Solution
Heat can be transferred by conduction, convection, and radiation, which are the three primary modes of heat transfer.
Correct Answer:
C
— Heat can be transferred by conduction, convection, and radiation
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