Power Engineering 4A - Unit 2 - Elementary Physical, Chemical, and Thermodynamic Principles Questions with Correct Answers
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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...
Power Engineering 4A - Unit 2 - Elementary Physical,
Chemical, and Thermodynamic Principles Questions
with Correct 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
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
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
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
In fin coil type heaters, individual room temperature is controlled by
Select one:
a. Switches
b. Automatic valves
c. Dampers
d. Air relays
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