DC THIRD CLASS STATIONARY BOILER
EXAM 2025 QUESTIONS AND ANSWERS
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
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, 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
a malfunction in the deaerate feed water tank is indicated by ? - ANS Boiler requiring
excessive amount of oxygen scavenge chemicals.
what uses the theory of centirifical force that applies to the roating element of turbine and
controls the speed of the turbine? - ANS Speed Governor
which of the following is not purpose of an air cock on a steam drum ? - ANS to let the air
escape while filing the drum
which of the following types of boiler is more suited for pressure exceeding 350 psi? -
ANS Scotch Marine
2
Page
@COPYRIGHT FYNDLAY 2025/2026
EXAM 2025 QUESTIONS AND ANSWERS
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
1Page
@COPYRIGHT FYNDLAY 2025/2026
, 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
a malfunction in the deaerate feed water tank is indicated by ? - ANS Boiler requiring
excessive amount of oxygen scavenge chemicals.
what uses the theory of centirifical force that applies to the roating element of turbine and
controls the speed of the turbine? - ANS Speed Governor
which of the following is not purpose of an air cock on a steam drum ? - ANS to let the air
escape while filing the drum
which of the following types of boiler is more suited for pressure exceeding 350 psi? -
ANS Scotch Marine
2
Page
@COPYRIGHT FYNDLAY 2025/2026
