DC Third Class Stationary
Boiler Exam Study Guide –
Practice Questions with
Answers. GRADED A+. Latest
2026/2027 Update.
What is the thermal efficiency percentage of boiler with a stack temperature of
600 F and furnace temperature of 2800 F ? - Ans✔✔-78.5
What is the proper order of zeolite rejuvenation water softener . - Ans✔✔-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% - Ans✔✔-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 - Ans✔✔-120 volts
steam (High Velocity) what kind of energy ? - Ans✔✔-Mechanical
, Which of the following statement is not ture concerning a superheat ? -
Ans✔✔-Super Heater (BTU)
The ______ pump supplies the water to the condenser to condense the steam.
- Ans✔✔-Condensate
What is the first thing that happen for a three-element regulator to change the
output of the controller? - Ans✔✔-Condensate Flow Increases
The primary reason for using wet scrubbers is to ? - Ans✔✔-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 ________ ? - Ans✔✔-Shroud
Ring
The refrigerant in a condenser to usually sub cooled between _________
degree F below the condensing temperature? - Ans✔✔-.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 ? - Ans✔✔-
Steam Flow, Feedwater and drum level
given thermocouples have both a hot junction and a cold junction. the cold
junction measured the ____________ point ? - Ans✔✔-Reference
A water heating system that uses the same pipe for supply and return is called
a __________ system - Ans✔✔-One pipe
Boiler Exam Study Guide –
Practice Questions with
Answers. GRADED A+. Latest
2026/2027 Update.
What is the thermal efficiency percentage of boiler with a stack temperature of
600 F and furnace temperature of 2800 F ? - Ans✔✔-78.5
What is the proper order of zeolite rejuvenation water softener . - Ans✔✔-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% - Ans✔✔-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 - Ans✔✔-120 volts
steam (High Velocity) what kind of energy ? - Ans✔✔-Mechanical
, Which of the following statement is not ture concerning a superheat ? -
Ans✔✔-Super Heater (BTU)
The ______ pump supplies the water to the condenser to condense the steam.
- Ans✔✔-Condensate
What is the first thing that happen for a three-element regulator to change the
output of the controller? - Ans✔✔-Condensate Flow Increases
The primary reason for using wet scrubbers is to ? - Ans✔✔-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 ________ ? - Ans✔✔-Shroud
Ring
The refrigerant in a condenser to usually sub cooled between _________
degree F below the condensing temperature? - Ans✔✔-.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 ? - Ans✔✔-
Steam Flow, Feedwater and drum level
given thermocouples have both a hot junction and a cold junction. the cold
junction measured the ____________ point ? - Ans✔✔-Reference
A water heating system that uses the same pipe for supply and return is called
a __________ system - Ans✔✔-One pipe
