Power Engineering 4A - Unit 2 -
Elementary Physical, Chemical, and
Thermodynamic Principles Exam
Questions & Answers (Grade A+)
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
c. Half-serpentine coil circuitry
d. Parallel flow coils
,Power Engineering 4A - Unit 2 -
Elementary Physical, Chemical, and
Thermodynamic Principles Exam
Questions & Answers (Grade A+)
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
,Power Engineering 4A - Unit 2 -
Elementary Physical, Chemical, and
Thermodynamic Principles Exam
Questions & Answers (Grade A+)
d. Solids contract when heated.
e. Water will only expand when its temperature is increased. -
correct answer ✅C
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
, Power Engineering 4A - Unit 2 -
Elementary Physical, Chemical, and
Thermodynamic Principles Exam
Questions & Answers (Grade A+)
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
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:
Elementary Physical, Chemical, and
Thermodynamic Principles Exam
Questions & Answers (Grade A+)
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
c. Half-serpentine coil circuitry
d. Parallel flow coils
,Power Engineering 4A - Unit 2 -
Elementary Physical, Chemical, and
Thermodynamic Principles Exam
Questions & Answers (Grade A+)
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
,Power Engineering 4A - Unit 2 -
Elementary Physical, Chemical, and
Thermodynamic Principles Exam
Questions & Answers (Grade A+)
d. Solids contract when heated.
e. Water will only expand when its temperature is increased. -
correct answer ✅C
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
, Power Engineering 4A - Unit 2 -
Elementary Physical, Chemical, and
Thermodynamic Principles Exam
Questions & Answers (Grade A+)
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
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:
