DC THIRD CLASS STATIONARY BOILER Exam (Recent exam) Fully
solved & updated 2026 Most COMPLETE (2026) (Latest Update 2026)
UPDATE!!
What is the thermal efficiency percentage of boiler with a stack temperature of 600 F and furnace
temperature of 2800 F ? - (ANSWER)78.5
What is the proper order of zeolite rejuvenation water softener . - (ANSWER)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% -
(ANSWER)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 - (ANSWER)120 volts
steam (High Velocity) what kind of energy ? - (ANSWER)Mechanical
Which of the following statement is not ture concerning a superheat ? - (ANSWER)Super Heater (BTU)
The ______ pump supplies the water to the condenser to condense the steam. - (ANSWER)Condensate
What is the first thing that happen for a three-element regulator to change the output of the controller?
- (ANSWER)Condensate Flow Increases
The primary reason for using wet scrubbers is to ? - (ANSWER)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 ________ ? - (ANSWER)Shroud Ring
, DC THIRD CLASS STATIONARY BOILER Exam (Recent exam) Fully
solved & updated 2026 Most COMPLETE (2026) (Latest Update 2026)
UPDATE!!
The refrigerant in a condenser to usually sub cooled between _________ degree F below the condensing
temperature? - (ANSWER).7 to 9 degrees
if you are operation a boiler with a three-element feed water regulator, what is being measured and
recorded by mechanically operated water ? - (ANSWER)Steam Flow, Feedwater and drum level
given thermocouples have both a hot junction and a cold junction. the cold junction measured the
____________ point ? - (ANSWER)Reference
A water heating system that uses the same pipe for supply and return is called a __________ system -
(ANSWER)One pipe
a malfunction in the deaerate feed water tank is indicated by ? - (ANSWER)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? - (ANSWER)Speed Governor
which of the following is not purpose of an air cock on a steam drum ? - (ANSWER)to let the air escape
while filing the drum
which of the following types of boiler is more suited for pressure exceeding 350 psi? - (ANSWER)Scotch
Marine
An automatic control valve commonly used to maintain feed water level in a boiler whose internal design
is constructed with 2 valve and ? - (ANSWER)balancing valve
solved & updated 2026 Most COMPLETE (2026) (Latest Update 2026)
UPDATE!!
What is the thermal efficiency percentage of boiler with a stack temperature of 600 F and furnace
temperature of 2800 F ? - (ANSWER)78.5
What is the proper order of zeolite rejuvenation water softener . - (ANSWER)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% -
(ANSWER)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 - (ANSWER)120 volts
steam (High Velocity) what kind of energy ? - (ANSWER)Mechanical
Which of the following statement is not ture concerning a superheat ? - (ANSWER)Super Heater (BTU)
The ______ pump supplies the water to the condenser to condense the steam. - (ANSWER)Condensate
What is the first thing that happen for a three-element regulator to change the output of the controller?
- (ANSWER)Condensate Flow Increases
The primary reason for using wet scrubbers is to ? - (ANSWER)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 ________ ? - (ANSWER)Shroud Ring
, DC THIRD CLASS STATIONARY BOILER Exam (Recent exam) Fully
solved & updated 2026 Most COMPLETE (2026) (Latest Update 2026)
UPDATE!!
The refrigerant in a condenser to usually sub cooled between _________ degree F below the condensing
temperature? - (ANSWER).7 to 9 degrees
if you are operation a boiler with a three-element feed water regulator, what is being measured and
recorded by mechanically operated water ? - (ANSWER)Steam Flow, Feedwater and drum level
given thermocouples have both a hot junction and a cold junction. the cold junction measured the
____________ point ? - (ANSWER)Reference
A water heating system that uses the same pipe for supply and return is called a __________ system -
(ANSWER)One pipe
a malfunction in the deaerate feed water tank is indicated by ? - (ANSWER)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? - (ANSWER)Speed Governor
which of the following is not purpose of an air cock on a steam drum ? - (ANSWER)to let the air escape
while filing the drum
which of the following types of boiler is more suited for pressure exceeding 350 psi? - (ANSWER)Scotch
Marine
An automatic control valve commonly used to maintain feed water level in a boiler whose internal design
is constructed with 2 valve and ? - (ANSWER)balancing valve
