Power Engineering 4A - Unit 2 - Elementary
Physical, Chemical, and Thermodynamic
Principles Exam 2025 Questions and Answers
The Second Law of Thermodynamics states that in order to transfer heat from a colder substance
to a hotter substance, _________ must be supplied.
Select one:
a. Internal energy.
b. External work.
c. Intense energy.
d. Mechanical refrigeration.
e. Physical labour. - CORRECT ANSWER✔️✔️-B
Which one of the following methods is a method of ensuring uniform steam distribution in steam
coils?
Select one:
a. Installation of distributing plates within the steam header
b. Controlling the face velocity of the air flowing over coils, using face and bypass dampers
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,c. Half-serpentine coil circuitry
d. Parallel flow coils
e. Double-serpentine coil circuitry - CORRECT ANSWER✔️✔️-A
An example of a heterogeneous mixture is:
Select one:
a. Flue gas
b. Stainless steel
c. Soda water
d. Acid
e. Sand and water - CORRECT ANSWER✔️✔️-E
Which of the following statements is TRUE?
Select one:
a. In general, coefficients of expansion of solids are greater than those of liquids.
b. Liquids do not contract when cooled.
c. The Coefficient of Expansion for a liquid changes if the liquid temperature changes
d. Solids contract when heated.
e. Water will only expand when its temperature is increased. - CORRECT ANSWER✔️✔️-C
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
,Find the quantity of heat required to raise the temperature of 6.3 kg of glass from 6°C to 210°C if
the specific heat of glass is 670 J/kg K.
Select one:
a. 886.4 kJ
b. 861.2 kJ
c. 25.3 kJ
d. 911.7 kJ
e. 75.3 kJ - CORRECT ANSWER✔️✔️-B
In the Steam Tables, the numbers given for the specific volume of steam are in what units?
Select one:
a. cubic centimeters
b. cubic centimeters per gram
c. cubic meters per kilogram
d. kilograms per cubic meter
e. grams per cubic centimeter - CORRECT ANSWER✔️✔️-B
If a substance goes through a process that changes its composition so that it is no longer the same
substance, then the substance has undergone a:
Select one:
a. Mechanical change
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, b. Chemical change
c. Homogeneous change
d. Heterogeneous change
e. Physical change - CORRECT ANSWER✔️✔️-B
With counter flow arrangement of air and water in a cooling or heating coil:
Select one:
a. The water supply connection is on the same side as the entering air
b. The heat transfer efficiency is the same as with parallel arrangement of air and water
c. The water supply connection is on the same side as the air leaving the coil
d. The water return connection is on the same side as the leaving air
e. It decreases the heat transfer efficiency - CORRECT ANSWER✔️✔️-C
Which of the following is NOT a form of refrigeration evaporator construction?
Select one:
a. Bare tube
b. Plate surface
c. Shell and tube
d. Finned tube
e. Double-tube - CORRECT ANSWER✔️✔️-E
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 4
Physical, Chemical, and Thermodynamic
Principles Exam 2025 Questions and Answers
The Second Law of Thermodynamics states that in order to transfer heat from a colder substance
to a hotter substance, _________ must be supplied.
Select one:
a. Internal energy.
b. External work.
c. Intense energy.
d. Mechanical refrigeration.
e. Physical labour. - CORRECT ANSWER✔️✔️-B
Which one of the following methods is a method of ensuring uniform steam distribution in steam
coils?
Select one:
a. Installation of distributing plates within the steam header
b. Controlling the face velocity of the air flowing over coils, using face and bypass dampers
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,c. Half-serpentine coil circuitry
d. Parallel flow coils
e. Double-serpentine coil circuitry - CORRECT ANSWER✔️✔️-A
An example of a heterogeneous mixture is:
Select one:
a. Flue gas
b. Stainless steel
c. Soda water
d. Acid
e. Sand and water - CORRECT ANSWER✔️✔️-E
Which of the following statements is TRUE?
Select one:
a. In general, coefficients of expansion of solids are greater than those of liquids.
b. Liquids do not contract when cooled.
c. The Coefficient of Expansion for a liquid changes if the liquid temperature changes
d. Solids contract when heated.
e. Water will only expand when its temperature is increased. - CORRECT ANSWER✔️✔️-C
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
,Find the quantity of heat required to raise the temperature of 6.3 kg of glass from 6°C to 210°C if
the specific heat of glass is 670 J/kg K.
Select one:
a. 886.4 kJ
b. 861.2 kJ
c. 25.3 kJ
d. 911.7 kJ
e. 75.3 kJ - CORRECT ANSWER✔️✔️-B
In the Steam Tables, the numbers given for the specific volume of steam are in what units?
Select one:
a. cubic centimeters
b. cubic centimeters per gram
c. cubic meters per kilogram
d. kilograms per cubic meter
e. grams per cubic centimeter - CORRECT ANSWER✔️✔️-B
If a substance goes through a process that changes its composition so that it is no longer the same
substance, then the substance has undergone a:
Select one:
a. Mechanical change
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
, b. Chemical change
c. Homogeneous change
d. Heterogeneous change
e. Physical change - CORRECT ANSWER✔️✔️-B
With counter flow arrangement of air and water in a cooling or heating coil:
Select one:
a. The water supply connection is on the same side as the entering air
b. The heat transfer efficiency is the same as with parallel arrangement of air and water
c. The water supply connection is on the same side as the air leaving the coil
d. The water return connection is on the same side as the leaving air
e. It decreases the heat transfer efficiency - CORRECT ANSWER✔️✔️-C
Which of the following is NOT a form of refrigeration evaporator construction?
Select one:
a. Bare tube
b. Plate surface
c. Shell and tube
d. Finned tube
e. Double-tube - CORRECT ANSWER✔️✔️-E
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 4
