Power Engineering 4th Class B 9 chapter 1 Exam 2025 Questions and Answers

Power Engineering 4th Class B 9
chapter 1 Exam 2025 Questions and
Answers


The saturation temperature of a refrigerant is the same as its:

Choose one answer.

a. Boiling point

b. Freezing point

c. Flash point

d. Fire point


e. Auto ignition temperature - CORRECT ANSWER✔️✔️-a


Which of the following correctly describes the heat transfer that takes place in a simple ice-box?

Choose one answer.

a. There is a net loss of heat from the system, as the air cools

b. Air gives up sensible heat; ice does not gain any heat

c. Air gives up sensible heat; ice gains sensible heat


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, d. Air gives up sensible heat; ice gains latent heat of fusion


e. Air gives up latent heat; ice gains latent heat of condensation - CORRECT ANSWER✔️✔️-d


Heat that causes an increase in temperature, is called _____ heat:

Choose one answer.

a. Conductive

b. Radiant

c. Sensible

d. Latent


e. Convective - CORRECT ANSWER✔️✔️-c


Refrigerants will evaporate when the:

Choose one answer.

a. Pressure is increased

b. Temperature is increased to saturation temperature

c. They are diluted

d. Temperature is reduced below saturation temperature


e. Heat is removed from them - CORRECT ANSWER✔️✔️-b


In a refrigeration system, the liquid refrigerant is changed to a gas in the:

Choose one answer.




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