3rd Class Power Engineering - B1 - Part 1 |400
questions with accurate answers
"Combustion air swirls in the opposite direction to the oil mist resulting
in good, turbulent mixing which creates efficient combustion." True or
False? Ans✓✓✓ 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? Ans✓✓✓ 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? Ans✓✓✓ 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? Ans✓✓✓ - 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? Ans✓✓✓ -
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? Ans✓✓✓ -
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? Ans✓✓✓ 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? Ans✓✓✓ 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? Ans✓✓✓ Dry type and Wet Type
2 types of Coal Storage (stockpiling)? Ans✓✓✓ - Active Storage
- Reserve Storage
,2 types of draft fans in a Steam Generating Unit? Ans✓✓✓ - 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? Ans✓✓✓ Single sided entry or Double sided
entry
2 types of Fluidized bed boilers? Ans✓✓✓ - Bubbling Fluidized bed
- Circulating Fluidized bed
2 types of Forced Circulation Boilers? Ans✓✓✓ 1) Controlled
Circulation or Recirculating boilers
2) Once-Through boilers
2 types of Sulphur Dioxide Recovery Systems? Ans✓✓✓ Wet
Scrubbers and Dry Scrubbers
2 ways Fuel Oil storage tanks can be stored? Ans✓✓✓ Above ground
or Under ground
3 classes of Boiler Drum Internals, according to their purpose?
Ans✓✓✓ 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? Ans✓✓✓ -
Multi-Spud Burner
- Ring Type Burner
- High Efficiency Low-NOx Burner
3 means of determining Boiler Rating? Ans✓✓✓ 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? Ans✓✓✓ - Inlet Dampers or
Vanes
- Outlet Dampers
- Variable fan speed
3 reasons the Blowoff Connection is made at the lowest point of the
boiler? Ans✓✓✓ 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
questions with accurate answers
"Combustion air swirls in the opposite direction to the oil mist resulting
in good, turbulent mixing which creates efficient combustion." True or
False? Ans✓✓✓ 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? Ans✓✓✓ 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? Ans✓✓✓ 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? Ans✓✓✓ - 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? Ans✓✓✓ -
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? Ans✓✓✓ -
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? Ans✓✓✓ 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? Ans✓✓✓ 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? Ans✓✓✓ Dry type and Wet Type
2 types of Coal Storage (stockpiling)? Ans✓✓✓ - Active Storage
- Reserve Storage
,2 types of draft fans in a Steam Generating Unit? Ans✓✓✓ - 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? Ans✓✓✓ Single sided entry or Double sided
entry
2 types of Fluidized bed boilers? Ans✓✓✓ - Bubbling Fluidized bed
- Circulating Fluidized bed
2 types of Forced Circulation Boilers? Ans✓✓✓ 1) Controlled
Circulation or Recirculating boilers
2) Once-Through boilers
2 types of Sulphur Dioxide Recovery Systems? Ans✓✓✓ Wet
Scrubbers and Dry Scrubbers
2 ways Fuel Oil storage tanks can be stored? Ans✓✓✓ Above ground
or Under ground
3 classes of Boiler Drum Internals, according to their purpose?
Ans✓✓✓ 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? Ans✓✓✓ -
Multi-Spud Burner
- Ring Type Burner
- High Efficiency Low-NOx Burner
3 means of determining Boiler Rating? Ans✓✓✓ 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? Ans✓✓✓ - Inlet Dampers or
Vanes
- Outlet Dampers
- Variable fan speed
3 reasons the Blowoff Connection is made at the lowest point of the
boiler? Ans✓✓✓ 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
