Power Engineering 4A - Unit 2 -
Elementary Physical, Chemical,
and Thermodynamic Principles
A
R
U
LA
C
O
D
,The Second Law of Thermodynamics states that in order to transfer heat from a colder
substance to a hotter substance, _________ must be supplied.
A
Select one:
a. Internal energy.
b. External work.
R
c. Intense energy.
d. Mechanical refrigeration.
e. Physical labour. - ANS B
U
Which one of the following methods is a method of ensuring uniform steam distribution in steam
coils?
Select one:
LA
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
e. Double-serpentine coil circuitry - ANS A
C
An example of a heterogeneous mixture is:
Select one:
a. Flue gas
b. Stainless steel
O
c. Soda water
d. Acid
e. Sand and water - ANS E
D
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. - ANS 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 - ANS B
In the Steam Tables, the numbers given for the specific volume of steam are in what units?
Select one:
A
a. cubic centimeters
b. cubic centimeters per gram
c. cubic meters per kilogram
R
d. kilograms per cubic meter
e. grams per cubic centimeter - ANS B
If a substance goes through a process that changes its composition so that it is no longer the
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same substance, then the substance has undergone a:
Select one:
a. Mechanical change
LA
b. Chemical change
c. Homogeneous change
d. Heterogeneous change
e. Physical change - ANS B
With counter flow arrangement of air and water in a cooling or heating coil:
C
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
O
d. The water return connection is on the same side as the leaving air
e. It decreases the heat transfer efficiency - ANS C
D
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 - ANS E
In fin coil type heaters, individual room temperature is controlled by
Select one:
Elementary Physical, Chemical,
and Thermodynamic Principles
A
R
U
LA
C
O
D
,The Second Law of Thermodynamics states that in order to transfer heat from a colder
substance to a hotter substance, _________ must be supplied.
A
Select one:
a. Internal energy.
b. External work.
R
c. Intense energy.
d. Mechanical refrigeration.
e. Physical labour. - ANS B
U
Which one of the following methods is a method of ensuring uniform steam distribution in steam
coils?
Select one:
LA
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
e. Double-serpentine coil circuitry - ANS A
C
An example of a heterogeneous mixture is:
Select one:
a. Flue gas
b. Stainless steel
O
c. Soda water
d. Acid
e. Sand and water - ANS E
D
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. - ANS 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 - ANS B
In the Steam Tables, the numbers given for the specific volume of steam are in what units?
Select one:
A
a. cubic centimeters
b. cubic centimeters per gram
c. cubic meters per kilogram
R
d. kilograms per cubic meter
e. grams per cubic centimeter - ANS B
If a substance goes through a process that changes its composition so that it is no longer the
U
same substance, then the substance has undergone a:
Select one:
a. Mechanical change
LA
b. Chemical change
c. Homogeneous change
d. Heterogeneous change
e. Physical change - ANS B
With counter flow arrangement of air and water in a cooling or heating coil:
C
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
O
d. The water return connection is on the same side as the leaving air
e. It decreases the heat transfer efficiency - ANS C
D
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 - ANS E
In fin coil type heaters, individual room temperature is controlled by
Select one:
