3rd Class Power Engineering - B1 - Part 1 3B1 Study
Questions With Complete Solutions
"Combustion air swirls in the opposite direction to the oil mist
resulting in good, turbulent mixing which creates efficient
combustion." True or False? Correct Answers True
"The lowest visible water level in a gauge glass shall be at least
2 inches (50 mm) above the lowest permissible water level, as
determined by the boiler manufacturer." True or False? Correct
Answers True. This assures that as long as water is visible in
the gauge glass, the boiler is not dangerously low on water level.
2 main functions of the programming control for a fully
automatic packaged boiler? Correct Answers 1) It programs the
operation of the fan, ignition system, fuel valves and modulator
system in proper sequence, which includes purge periods before
ignition and after shutdown
2) It monitors both pilot and main flame and does not allowed
the main fuel valve be energized unless the pilot flame has been
established. It also de energizes the fuel valves 1 to 4 seconds
after main flame is lost
2 major advantages of Superheated steam? Correct Answers -
Increased temperature of the steam means increased energy per
kg of steam, which allows the steam to do more work
- Increased temperature means the steam will not condense as
quickly when being consumed through a process. This is
especially desirable in such situations as a steam turbine where
any presence of moisture would rapidly erode turbine blades and
decrease efficiency
,2 reasons for Reheating steam to its original temperature?
Correct Answers - To prevent excessive condensation of the
steam in the low pressure stages of the turbine
- To increase the cycle efficiency to some extent by increasing
the proportion of available energy per kilogram of steam
2 thing to check in preparation to Drying out Refractory?
Correct Answers - Ensure that the low water level shutdown is
ON and make sure the drum vent is open when filling
- Ensure the gauge glass is in service
2 things all Gas Burners must be able to accomplish? Correct
Answers 1) Must be able to control the amount of air admitted
to burn the gas
2) Must be able to cause turbulent mixing of the gas and air
2 types of Attemperators? Correct Answers 1) Surface
Attemperator: The cooling medium is separated from the steam
by a tube surface
2) Direct Contact Attemperator: The cooling medium directly
contacts the steam
2 types of Bottom Ash Hoppers? Correct Answers Dry type and
Wet Type
2 types of Coal Storage (stockpiling)? Correct Answers - Active
Storage
- Reserve Storage
,2 types of draft fans in a Steam Generating Unit? Correct
Answers - Forced and Induced draft fans
- Induced draft fans exhaust the combustion gases from the Air
Heater to the stack at a temperature around 170 deg.C
2 types of Fan Inlets? Correct Answers Single sided entry or
Double sided entry
2 types of Fluidized bed boilers? Correct Answers - Bubbling
Fluidized bed
- Circulating Fluidized bed
2 types of Forced Circulation Boilers? Correct Answers 1)
Controlled Circulation or Recirculating boilers
2) Once-Through boilers
2 types of Sulphur Dioxide Recovery Systems? Correct Answers
Wet Scrubbers and Dry Scrubbers
2 ways Fuel Oil storage tanks can be stored? Correct Answers
Above ground or Under ground
3 classes of Boiler Drum Internals, according to their purpose?
Correct Answers 1) First Class: To remove moisture and
impurities from the steam
2) Second Class: To distribute feedwater within the drum
3) Third Class: To provide continuous blowoff of concentrated
boiler water
3 common types of Gas Burners for steam generators? Correct
Answers - Multi-Spud Burner
, - Ring Type Burner
- High Efficiency Low-NOx Burner
3 means of determining Boiler Rating? Correct Answers 1)
Heating Surface: 1 Square meter equals 10 kilowatts
2) Where electric power is used, the boiler rating is the
maximum kilowatt rating of the heating element
3) Where heating surface or electric power is not applicable, an
hourly boiler output of 36 MJ is equal to 10 kilowatts
3 means of Output Control for Fans? Correct Answers - Inlet
Dampers or Vanes
- Outlet Dampers
- Variable fan speed
3 reasons the Blowoff Connection is made at the lowest point of
the boiler? Correct Answers 1) Drain the boiler efficiently
2) Blow mud and sediment out of the boiler
3) Lower the concentration of dissolved impurities in the boiler
water
3 types of Ash Handling Systems? Correct Answers - Hydro, or
water-powered system
- Pneumatic, or air-powered system
- Mechanical System
3 types of cyclone fired boiler furnaces? Correct Answers -
Screened furnace
- Open furnace
- Dual-open furnace
Questions With Complete Solutions
"Combustion air swirls in the opposite direction to the oil mist
resulting in good, turbulent mixing which creates efficient
combustion." True or False? Correct Answers True
"The lowest visible water level in a gauge glass shall be at least
2 inches (50 mm) above the lowest permissible water level, as
determined by the boiler manufacturer." True or False? Correct
Answers True. This assures that as long as water is visible in
the gauge glass, the boiler is not dangerously low on water level.
2 main functions of the programming control for a fully
automatic packaged boiler? Correct Answers 1) It programs the
operation of the fan, ignition system, fuel valves and modulator
system in proper sequence, which includes purge periods before
ignition and after shutdown
2) It monitors both pilot and main flame and does not allowed
the main fuel valve be energized unless the pilot flame has been
established. It also de energizes the fuel valves 1 to 4 seconds
after main flame is lost
2 major advantages of Superheated steam? Correct Answers -
Increased temperature of the steam means increased energy per
kg of steam, which allows the steam to do more work
- Increased temperature means the steam will not condense as
quickly when being consumed through a process. This is
especially desirable in such situations as a steam turbine where
any presence of moisture would rapidly erode turbine blades and
decrease efficiency
,2 reasons for Reheating steam to its original temperature?
Correct Answers - To prevent excessive condensation of the
steam in the low pressure stages of the turbine
- To increase the cycle efficiency to some extent by increasing
the proportion of available energy per kilogram of steam
2 thing to check in preparation to Drying out Refractory?
Correct Answers - Ensure that the low water level shutdown is
ON and make sure the drum vent is open when filling
- Ensure the gauge glass is in service
2 things all Gas Burners must be able to accomplish? Correct
Answers 1) Must be able to control the amount of air admitted
to burn the gas
2) Must be able to cause turbulent mixing of the gas and air
2 types of Attemperators? Correct Answers 1) Surface
Attemperator: The cooling medium is separated from the steam
by a tube surface
2) Direct Contact Attemperator: The cooling medium directly
contacts the steam
2 types of Bottom Ash Hoppers? Correct Answers Dry type and
Wet Type
2 types of Coal Storage (stockpiling)? Correct Answers - Active
Storage
- Reserve Storage
,2 types of draft fans in a Steam Generating Unit? Correct
Answers - Forced and Induced draft fans
- Induced draft fans exhaust the combustion gases from the Air
Heater to the stack at a temperature around 170 deg.C
2 types of Fan Inlets? Correct Answers Single sided entry or
Double sided entry
2 types of Fluidized bed boilers? Correct Answers - Bubbling
Fluidized bed
- Circulating Fluidized bed
2 types of Forced Circulation Boilers? Correct Answers 1)
Controlled Circulation or Recirculating boilers
2) Once-Through boilers
2 types of Sulphur Dioxide Recovery Systems? Correct Answers
Wet Scrubbers and Dry Scrubbers
2 ways Fuel Oil storage tanks can be stored? Correct Answers
Above ground or Under ground
3 classes of Boiler Drum Internals, according to their purpose?
Correct Answers 1) First Class: To remove moisture and
impurities from the steam
2) Second Class: To distribute feedwater within the drum
3) Third Class: To provide continuous blowoff of concentrated
boiler water
3 common types of Gas Burners for steam generators? Correct
Answers - Multi-Spud Burner
, - Ring Type Burner
- High Efficiency Low-NOx Burner
3 means of determining Boiler Rating? Correct Answers 1)
Heating Surface: 1 Square meter equals 10 kilowatts
2) Where electric power is used, the boiler rating is the
maximum kilowatt rating of the heating element
3) Where heating surface or electric power is not applicable, an
hourly boiler output of 36 MJ is equal to 10 kilowatts
3 means of Output Control for Fans? Correct Answers - Inlet
Dampers or Vanes
- Outlet Dampers
- Variable fan speed
3 reasons the Blowoff Connection is made at the lowest point of
the boiler? Correct Answers 1) Drain the boiler efficiently
2) Blow mud and sediment out of the boiler
3) Lower the concentration of dissolved impurities in the boiler
water
3 types of Ash Handling Systems? Correct Answers - Hydro, or
water-powered system
- Pneumatic, or air-powered system
- Mechanical System
3 types of cyclone fired boiler furnaces? Correct Answers -
Screened furnace
- Open furnace
- Dual-open furnace
