DC THIRD CLASS STATIONARY BOILER
ACTUAL EXAM 2026 QUESTIONS WITH
SOLUTIONS GRADED A+
◉ 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
◉ 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,
when 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
ACTUAL EXAM 2026 QUESTIONS WITH
SOLUTIONS GRADED A+
◉ 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
◉ 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,
when 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
