DC Third Class Stationary Boiler Exam
Questions And Correct Answers
What is the thermal efficiency percentage of boiler with a stack temperature of 600 F
and furnace temperature of 2800 F ?
78.5
What is the proper order of zeolite rejuvenation water softener .
Back Wash, Brine, Rinse , and Service
given the three phase 480-volt motor has a current draw of 42amps and a power
factor rating of 90%
181
a four-wire wye-connected system with a phase-to-phase voltage of 208 volt has a
volta has a phase to neutral voltage of 120 volts
120 volts
steam (High Velocity) what kind of energy ?
,Mechanical
Which of the following statement is not ture concerning a superheat ?
Super Heater (BTU)
The ______ pump supplies the water to the condenser to condense the steam.
Condensate
What is the first thing that happen for a three-element regulator to change the output
of the controller?
Condensate Flow Increases
The primary reason for using wet scrubbers is to ?
Remove flue gas particulates
What is used on the outer rim of the blades or nozzles to stiffen the blade against
vibration and confine the steam to the ________ ?
Shroud Ring
, The refrigerant in a condenser to usually sub cooled between _________ degree F
below the condensing temperature?
.7 to 9 degrees
if you are operation a boiler with a three-element feed water regulator, when is being
measured and recorded by mechanically operated water ?
Steam Flow, Feedwater and drum level
given thermocouples have both a hot junction and a cold junction. the cold junction
measured the ____________ point ?
Reference
A water heating system that uses the same pipe for supply and return is called a
__________ system
One pipe
a malfunction in the deaerate feed water tank is indicated by ?
Boiler requiring excessive amount of oxygen scavenge chemicals.
Questions And Correct Answers
What is the thermal efficiency percentage of boiler with a stack temperature of 600 F
and furnace temperature of 2800 F ?
78.5
What is the proper order of zeolite rejuvenation water softener .
Back Wash, Brine, Rinse , and Service
given the three phase 480-volt motor has a current draw of 42amps and a power
factor rating of 90%
181
a four-wire wye-connected system with a phase-to-phase voltage of 208 volt has a
volta has a phase to neutral voltage of 120 volts
120 volts
steam (High Velocity) what kind of energy ?
,Mechanical
Which of the following statement is not ture concerning a superheat ?
Super Heater (BTU)
The ______ pump supplies the water to the condenser to condense the steam.
Condensate
What is the first thing that happen for a three-element regulator to change the output
of the controller?
Condensate Flow Increases
The primary reason for using wet scrubbers is to ?
Remove flue gas particulates
What is used on the outer rim of the blades or nozzles to stiffen the blade against
vibration and confine the steam to the ________ ?
Shroud Ring
, The refrigerant in a condenser to usually sub cooled between _________ degree F
below the condensing temperature?
.7 to 9 degrees
if you are operation a boiler with a three-element feed water regulator, when is being
measured and recorded by mechanically operated water ?
Steam Flow, Feedwater and drum level
given thermocouples have both a hot junction and a cold junction. the cold junction
measured the ____________ point ?
Reference
A water heating system that uses the same pipe for supply and return is called a
__________ system
One pipe
a malfunction in the deaerate feed water tank is indicated by ?
Boiler requiring excessive amount of oxygen scavenge chemicals.
