DC BOILER STATIONARY THIRD TESTING EXAM ACTUAL
EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES|AGRADE
Moving blading in which space between blades is the same size at the blading inlet,
and the blading outlet. - ANSWER: Impulse Blading
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
Which of the following indicates a malfunction in the DC heater? 1. The boiler
requires excessive amounts of oxygen absorbing chemicals.
2.Water and steam are entering the DC heater at the same temperature. - ANSWER:
Both 1 & 2
______ is the plasticity exhibited by a material under tension loading. - ANSWER:
Ductility
In a pressure atomizing fuel oil-burner, atomization of fuel is produced by the
_______. - ANSWER: Burner tip and high pressure fuel
The ends of boiler tubes are secured to headers by______. - ANSWER: Expanding
A_______ is a process condition that must be met before a certain action may be
taken. - ANSWER: Permissive
______ is the ability of a material to return to its original shape after being
deformed. - ANSWER: Resiliency
In a three-element feedwater regulating system, __________ are measured. -
ANSWER: steam flow, feedwater flow, and water level
A ________ is a highly efficient ion-exchange process in which resin is regenerated
with sulfuric acid in the first vessel and caustic soda in the second vessel - ANSWER:
demineralizer
The purpose of the diffuser in a boiler burner assembly is to ______. - ANSWER:
shield the flame from the incoming air blast while allowing some mixing of fuel and
air
How many horsepower are required to raise 3500 pounds to a height of 175 feet at
60% efficiency? - ANSWER: 31
EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES|AGRADE
Moving blading in which space between blades is the same size at the blading inlet,
and the blading outlet. - ANSWER: Impulse Blading
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
Which of the following indicates a malfunction in the DC heater? 1. The boiler
requires excessive amounts of oxygen absorbing chemicals.
2.Water and steam are entering the DC heater at the same temperature. - ANSWER:
Both 1 & 2
______ is the plasticity exhibited by a material under tension loading. - ANSWER:
Ductility
In a pressure atomizing fuel oil-burner, atomization of fuel is produced by the
_______. - ANSWER: Burner tip and high pressure fuel
The ends of boiler tubes are secured to headers by______. - ANSWER: Expanding
A_______ is a process condition that must be met before a certain action may be
taken. - ANSWER: Permissive
______ is the ability of a material to return to its original shape after being
deformed. - ANSWER: Resiliency
In a three-element feedwater regulating system, __________ are measured. -
ANSWER: steam flow, feedwater flow, and water level
A ________ is a highly efficient ion-exchange process in which resin is regenerated
with sulfuric acid in the first vessel and caustic soda in the second vessel - ANSWER:
demineralizer
The purpose of the diffuser in a boiler burner assembly is to ______. - ANSWER:
shield the flame from the incoming air blast while allowing some mixing of fuel and
air
How many horsepower are required to raise 3500 pounds to a height of 175 feet at
60% efficiency? - ANSWER: 31
