Comprehensive Boiler and Steam System Engineering:
Types, Components, and Operations Questions With
Complete Solutions
Are the main gas valves ON/OFF, normally open, single-seated
gas valves when the electric motors on the valves are energized?
Correct Answers False.
At what angle do most burners have the fuel entering the
combustion air stream? Correct Answers Right angle.
At what pressure should the drum vents be opened to avoid
vacuum formation? Correct Answers 170 kPa
At what speed does the cup of a rotary cup oil burner rotate?
Correct Answers 3,500 rpm
At what temperature does the thermal NOx reaction occur
rapidly? Correct Answers 1535 °C.
At what temperature does the threat of fire in coal stock become
a concern? Correct Answers 70 °C
Does the HRSG have supplemental firing in the form of duct
burners? Correct Answers False
Does the Kraft Process use sodium sulfide (NaSO4) as a makeup
chemical? Correct Answers False
How are boiler pressure parts allowed to expand? Correct
Answers Downwards
,How are covers held in place on the inside of the drum? Correct
Answers By means of bolts and yoke pieces.
How are drumheads formed from flat plate? Correct Answers
By hot pressing with suitable forming dies and machining the
grooves.
How can chemical carryover be prevented? Correct Answers
By chemical injection, mud drum blowdown, and maintaining
proper boiler load.
How can lower NOx be achieved? Correct Answers By
keeping the flame temperature as low as possible, using flue gas
recirculation and air staging.
How can mechanical carryover be prevented? Correct Answers
By careful boiler design and operating within design parameters
for water level and firing rates.
How can recovery systems for the removal of SO2 be classified?
Correct Answers Wet and dry
How can scale and mud formation be reduced in a boiler?
Correct Answers By treating suspended solids, removing them
through blow off, and feeding soda ash or caustic soda.
How can soot blowers be classified? Correct Answers Manual
operation, automatic operation, stationary operation, movable
operation.
,How can the popping pressure of a safety valve be increased?
Correct Answers The adjusting screw is moved downward
How is air supplied for combustion in a crossfeed stoker?
Correct Answers By a forced draft fan through openings in the
grate.
How is air supplied in an underfeed stoker? Correct Answers
Through tuyeres.
How is crushed coal injected into the fluidized bed? Correct
Answers By means of an air-stream
How is draft fan output controlled? Correct Answers By
variable speed, inlet damper control, outlet damper control.
How is draft measured? Correct Answers In cm of wg.
How is secondary air admitted to the burner housing? Correct
Answers Through adjustable vanes.
How is the output of the boiler expressed when it provides the
entire steam supply to an electric generating unit? Correct
Answers In terms of power output of the generator
How is water supplied to the boiler with On-Off boiler feed
water control? Correct Answers Intermittently
How many spuds does a multi-spud burner have? Correct
Answers Eight.
, How many stages does the heating of heavy fuel oil take place
in? Correct Answers Two.
How may boiler tubes be fabricated? Correct Answers In a
seamless form or welded
How often do steam atomizing burners require cleaning?
Correct Answers Less often than mechanical atomizers.
How often should boiler operators inspect the entire plant?
Correct Answers Every two hours
If the black liquor is too weak, what can it result in? Correct
Answers An explosion
In a cyclone precipitator, what does a spray of water do?
Correct Answers Turns individual dust particles into heavy mud
particles
In a vertical firing arrangement, where are the burners located?
Correct Answers In the furnace arch (top) and fire downward.
In an air atomizing oil burner, what is the air called? Correct
Answers Primary air.
In an airflow-fuel flow combustion control, what does the
airflow signal become? Correct Answers The set point of the
fuel controller.
Types, Components, and Operations Questions With
Complete Solutions
Are the main gas valves ON/OFF, normally open, single-seated
gas valves when the electric motors on the valves are energized?
Correct Answers False.
At what angle do most burners have the fuel entering the
combustion air stream? Correct Answers Right angle.
At what pressure should the drum vents be opened to avoid
vacuum formation? Correct Answers 170 kPa
At what speed does the cup of a rotary cup oil burner rotate?
Correct Answers 3,500 rpm
At what temperature does the thermal NOx reaction occur
rapidly? Correct Answers 1535 °C.
At what temperature does the threat of fire in coal stock become
a concern? Correct Answers 70 °C
Does the HRSG have supplemental firing in the form of duct
burners? Correct Answers False
Does the Kraft Process use sodium sulfide (NaSO4) as a makeup
chemical? Correct Answers False
How are boiler pressure parts allowed to expand? Correct
Answers Downwards
,How are covers held in place on the inside of the drum? Correct
Answers By means of bolts and yoke pieces.
How are drumheads formed from flat plate? Correct Answers
By hot pressing with suitable forming dies and machining the
grooves.
How can chemical carryover be prevented? Correct Answers
By chemical injection, mud drum blowdown, and maintaining
proper boiler load.
How can lower NOx be achieved? Correct Answers By
keeping the flame temperature as low as possible, using flue gas
recirculation and air staging.
How can mechanical carryover be prevented? Correct Answers
By careful boiler design and operating within design parameters
for water level and firing rates.
How can recovery systems for the removal of SO2 be classified?
Correct Answers Wet and dry
How can scale and mud formation be reduced in a boiler?
Correct Answers By treating suspended solids, removing them
through blow off, and feeding soda ash or caustic soda.
How can soot blowers be classified? Correct Answers Manual
operation, automatic operation, stationary operation, movable
operation.
,How can the popping pressure of a safety valve be increased?
Correct Answers The adjusting screw is moved downward
How is air supplied for combustion in a crossfeed stoker?
Correct Answers By a forced draft fan through openings in the
grate.
How is air supplied in an underfeed stoker? Correct Answers
Through tuyeres.
How is crushed coal injected into the fluidized bed? Correct
Answers By means of an air-stream
How is draft fan output controlled? Correct Answers By
variable speed, inlet damper control, outlet damper control.
How is draft measured? Correct Answers In cm of wg.
How is secondary air admitted to the burner housing? Correct
Answers Through adjustable vanes.
How is the output of the boiler expressed when it provides the
entire steam supply to an electric generating unit? Correct
Answers In terms of power output of the generator
How is water supplied to the boiler with On-Off boiler feed
water control? Correct Answers Intermittently
How many spuds does a multi-spud burner have? Correct
Answers Eight.
, How many stages does the heating of heavy fuel oil take place
in? Correct Answers Two.
How may boiler tubes be fabricated? Correct Answers In a
seamless form or welded
How often do steam atomizing burners require cleaning?
Correct Answers Less often than mechanical atomizers.
How often should boiler operators inspect the entire plant?
Correct Answers Every two hours
If the black liquor is too weak, what can it result in? Correct
Answers An explosion
In a cyclone precipitator, what does a spray of water do?
Correct Answers Turns individual dust particles into heavy mud
particles
In a vertical firing arrangement, where are the burners located?
Correct Answers In the furnace arch (top) and fire downward.
In an air atomizing oil burner, what is the air called? Correct
Answers Primary air.
In an airflow-fuel flow combustion control, what does the
airflow signal become? Correct Answers The set point of the
fuel controller.
