DC THIRD CLASS STATIONARY BOILER FINAL
PAPER 2026 COMPLETE QUESTIONS AND
DETAILED ANSWERS GRADED A+
◉ To blowdown a boiler equipped with a quick opening and slow
opening valve on the bottom blowdown line, the_________. Answer:
quick opening valve is opened first and closed last.
◉ Hardness of water is the measurement in ppm of ________ and
________ in the water. Answer: calcium and magnesium
◉ a duplex double-acting reciprocating feed water pump has____.
Answer: two steam Pistons 2 to 2 2/2 times larger in area than the water
piston
◉ Name a technique to control the nitrous oxide emissions. Answer:
Selective Catalytic Reduction
◉ Spalling in a boiler occurs in the ____? Answer: Combustion chamber
, ◉ A technology in which solid waste is heated in an oxygen starved
atmosphere to break down the solids into a gas is called ______?
Answer: Pyrolysis
◉ What is the primary purpose of using wet scrubbers? Answer: To
remove sulfur dioxides
◉ ________is a water-purification process in which the water to be
treated is pressurized and applied against the surface of a semipermeable
membrane. Answer: Reverse osmosis
◉ The airflow switch at the burner fan housing______. Answer: Ensures
the primary air fan is functioning
◉ A ______ is the condition that is being controlled. Answer: process
variable
◉ Although boiler tubes and boiler drums withstand the same pressure,
the walls of the boiler tubes are much thinner because ______. Answer:
The tubes are much smaller in diameter
◉ A lead sulfide cell detects_____. Answer: Burner pilot and main flame
◉ Which of the following indicates a malfunction in the DC heater? 1.
The boiler requires excessive amounts of oxygen absorbing chemicals.
PAPER 2026 COMPLETE QUESTIONS AND
DETAILED ANSWERS GRADED A+
◉ To blowdown a boiler equipped with a quick opening and slow
opening valve on the bottom blowdown line, the_________. Answer:
quick opening valve is opened first and closed last.
◉ Hardness of water is the measurement in ppm of ________ and
________ in the water. Answer: calcium and magnesium
◉ a duplex double-acting reciprocating feed water pump has____.
Answer: two steam Pistons 2 to 2 2/2 times larger in area than the water
piston
◉ Name a technique to control the nitrous oxide emissions. Answer:
Selective Catalytic Reduction
◉ Spalling in a boiler occurs in the ____? Answer: Combustion chamber
, ◉ A technology in which solid waste is heated in an oxygen starved
atmosphere to break down the solids into a gas is called ______?
Answer: Pyrolysis
◉ What is the primary purpose of using wet scrubbers? Answer: To
remove sulfur dioxides
◉ ________is a water-purification process in which the water to be
treated is pressurized and applied against the surface of a semipermeable
membrane. Answer: Reverse osmosis
◉ The airflow switch at the burner fan housing______. Answer: Ensures
the primary air fan is functioning
◉ A ______ is the condition that is being controlled. Answer: process
variable
◉ Although boiler tubes and boiler drums withstand the same pressure,
the walls of the boiler tubes are much thinner because ______. Answer:
The tubes are much smaller in diameter
◉ A lead sulfide cell detects_____. Answer: Burner pilot and main flame
◉ Which of the following indicates a malfunction in the DC heater? 1.
The boiler requires excessive amounts of oxygen absorbing chemicals.
