DC BOILER STUDY SHEET 2026 UPDATED
QUESTIONS AND SOLUTIONS
◉ 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 pump delivers 175 gallons per minute against a pressure of 55
psi; the suction pressure is 15 psi. If a pump is 80% efficient, what is
the horsepower needed?
Answer: HP=5.1 HP= (Head in Feet) x (Weight in Lbs.)/ 33,000 x
Efficiency
◉ 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
◉ The thermal efficiency of a boiler with a stack temperature of
750°F and and a furnace temperature of 3200°F is_______?
Answer: 75% ((3200-750)/3200) x 100
◉ ________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
, ◉ How many inches of steam space in a cylinder of an engine
12"x28" and the stroke is 5/8 of its full travel?
Answer: 1978. V=AxL V=3.14(6x6)x28x.625= 1978
◉ What is the horsepower requirement of a pump that moves 2500
gpm of water against a head of 475' if the pump is operating at 58%
efficiency?
Answer: 516.8 HP=Head x Weight/33000 x efficiency. (Head =475,
Weight = 2500gpm x 8.33) (475x 20825)/19140
◉ 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
QUESTIONS AND SOLUTIONS
◉ 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 pump delivers 175 gallons per minute against a pressure of 55
psi; the suction pressure is 15 psi. If a pump is 80% efficient, what is
the horsepower needed?
Answer: HP=5.1 HP= (Head in Feet) x (Weight in Lbs.)/ 33,000 x
Efficiency
◉ 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
◉ The thermal efficiency of a boiler with a stack temperature of
750°F and and a furnace temperature of 3200°F is_______?
Answer: 75% ((3200-750)/3200) x 100
◉ ________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
, ◉ How many inches of steam space in a cylinder of an engine
12"x28" and the stroke is 5/8 of its full travel?
Answer: 1978. V=AxL V=3.14(6x6)x28x.625= 1978
◉ What is the horsepower requirement of a pump that moves 2500
gpm of water against a head of 475' if the pump is operating at 58%
efficiency?
Answer: 516.8 HP=Head x Weight/33000 x efficiency. (Head =475,
Weight = 2500gpm x 8.33) (475x 20825)/19140
◉ 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
