Power engineering Class 4 Part B Exam Questions With
Complete Solutions
a Correct Answers An eye made by using a Crosby clip will
have a strength
factor of
a) 80%
b) 50%
c) 95%
d) 75%
e) 90%
a Correct Answers Atmospheric burners are used for:
Choose one answer.
a. Gas stoves, hot water heaters, heating furnaces and many
heating boilers
b. Ring type burners
c. Coal firing
d. Lowering the relative humidity in the combustion air
e. Preheating the combustion air
a Correct Answers Ducts of large dimensions must be
diagonally creased to
a) provide stiffness
b) allow gradual duct size change
c) decrease duct weight
d) increase air velocity
e) decrease air friction in the duct work
,a Correct Answers Electrical power can be determined by the
formula
a) P = IE
b) I = ER
c) E = IR
d) R = EI
e) P = IR
a Correct Answers How often would you test the low level fuel
cut-off on a low pressure steam heating boiler by blowing out
the float chamber?
Choose one answer.
a. Daily
b. Monthly
c. Semi-annually
d. Annually
e. Bi-weekly
a Correct Answers If operating personnel from an old building
are going to be
transferred to the new building the system installed in the
new building will be the same as in the older building
because all the personnel are familiar with that system.
This type of system selection is based mainly on which of the
following factors?
a) Building owner's considerations
b) Geographical location
c) Building layout
d) Operating costs
,e) Maintenance requirements
a Correct Answers In a basic electric control system an example
of a controlled device is a:
Choose one answer.
a. fuel valve
b. thermostat
c. pressure-stat
d. humidistat
e. flow switch
a Correct Answers In a one pipe hot water system, the fitting
that directs the water to each converter is called the:
Choose one answer.
a. Diverter
b. Balancing valve
c. Vent valve
d. Separator
e. Syphon
a Correct Answers In a pulse combination furnace, the stated
efficiency is:
Choose one answer.
a. 94 - 98%
b. 80 - 95%
c. 70 - 75%
d. 60 - 70%
e. 50 - 60%
, a Correct Answers In an HVAC system, to provide a two-
position damper with manual proportional control, a/an
_________ is required.
Choose one answer.
a. Gradual switch
b. Offset returned air duct
c. Air mixer
d. Variable air volume box
e. Variable frequency motor drive
a Correct Answers In large buildings approximately what
percentage of the electrical load is lighting?
Choose one answer.
a. 60%
b. 40%
c. 70%
d. 75%
e. 80%
a Correct Answers Intercoolers:
Choose one answer.
a. Must have a drain
b. Are more efficient when cooled with air than with water
c. Are used on double acting single stage compressors
d. Help increase the volume of the air
e. Should use an antifreeze solution
a Correct Answers Large internal combustion engines are
cooled with:
Choose one answer.
a. Water jackets
Complete Solutions
a Correct Answers An eye made by using a Crosby clip will
have a strength
factor of
a) 80%
b) 50%
c) 95%
d) 75%
e) 90%
a Correct Answers Atmospheric burners are used for:
Choose one answer.
a. Gas stoves, hot water heaters, heating furnaces and many
heating boilers
b. Ring type burners
c. Coal firing
d. Lowering the relative humidity in the combustion air
e. Preheating the combustion air
a Correct Answers Ducts of large dimensions must be
diagonally creased to
a) provide stiffness
b) allow gradual duct size change
c) decrease duct weight
d) increase air velocity
e) decrease air friction in the duct work
,a Correct Answers Electrical power can be determined by the
formula
a) P = IE
b) I = ER
c) E = IR
d) R = EI
e) P = IR
a Correct Answers How often would you test the low level fuel
cut-off on a low pressure steam heating boiler by blowing out
the float chamber?
Choose one answer.
a. Daily
b. Monthly
c. Semi-annually
d. Annually
e. Bi-weekly
a Correct Answers If operating personnel from an old building
are going to be
transferred to the new building the system installed in the
new building will be the same as in the older building
because all the personnel are familiar with that system.
This type of system selection is based mainly on which of the
following factors?
a) Building owner's considerations
b) Geographical location
c) Building layout
d) Operating costs
,e) Maintenance requirements
a Correct Answers In a basic electric control system an example
of a controlled device is a:
Choose one answer.
a. fuel valve
b. thermostat
c. pressure-stat
d. humidistat
e. flow switch
a Correct Answers In a one pipe hot water system, the fitting
that directs the water to each converter is called the:
Choose one answer.
a. Diverter
b. Balancing valve
c. Vent valve
d. Separator
e. Syphon
a Correct Answers In a pulse combination furnace, the stated
efficiency is:
Choose one answer.
a. 94 - 98%
b. 80 - 95%
c. 70 - 75%
d. 60 - 70%
e. 50 - 60%
, a Correct Answers In an HVAC system, to provide a two-
position damper with manual proportional control, a/an
_________ is required.
Choose one answer.
a. Gradual switch
b. Offset returned air duct
c. Air mixer
d. Variable air volume box
e. Variable frequency motor drive
a Correct Answers In large buildings approximately what
percentage of the electrical load is lighting?
Choose one answer.
a. 60%
b. 40%
c. 70%
d. 75%
e. 80%
a Correct Answers Intercoolers:
Choose one answer.
a. Must have a drain
b. Are more efficient when cooled with air than with water
c. Are used on double acting single stage compressors
d. Help increase the volume of the air
e. Should use an antifreeze solution
a Correct Answers Large internal combustion engines are
cooled with:
Choose one answer.
a. Water jackets
