DC THIRD CLASS STATIONARY BOILER EXAM 2025
05/28/2026
COMPLETE EXAM QUESTIONS AND VERIFIED ANSWERS
Dc third class stationary boiler exam 2025 complete exam questions
and verified answers | real exam questions| 100%
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)
, DC THIRD CLASS STATIONARY BOILER EXAM 2025
05/28/2026
COMPLETE EXAM QUESTIONS AND VERIFIED ANSWERS
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
05/28/2026
COMPLETE EXAM QUESTIONS AND VERIFIED ANSWERS
Dc third class stationary boiler exam 2025 complete exam questions
and verified answers | real exam questions| 100%
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)
, DC THIRD CLASS STATIONARY BOILER EXAM 2025
05/28/2026
COMPLETE EXAM QUESTIONS AND VERIFIED ANSWERS
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
