LA Steam Engineer EXAM Questions and
Answers with complete solution2025(Graded
A+)
A desuperheater that is installed in a boiler is used to control.. - CORRECT ANSWERS
Super heated steam temperature
Economizers are finned to.. - CORRECT ANSWERS Increase the rate of heat
for heat transfer
The heat transfer taking place in a surface condenser is accomplished mainly by.. -
CORRECT ANSWERS Conduction
An unfired pressure vessel which is used to transfer heat from one substance to another
is called.. - CORRECT ANSWERS Feed water heater, Evaporator and Oil Cooler
Boiler economizers are primarily used for.. - CORRECT ANSWERS Recovery
heat from flue gas
The main purpose of the deaerator is to.. - CORRECT ANSWERS Eliminate
non-condensable gases
Superheated steam is more efficient because.. - CORRECT ANSWERS
Temperature & Total heat content are increased
A spear boiler feed water pump is equipped with a check valve in the discharge line to...
- CORRECT ANSWERS Permit fast start up by leaving the discharge valve open
Excessive fireside deposits on heating surfaces of a uncontrolled super heated boiler
would be indicated by... - CORRECT ANSWERS Decreased super heater outlet
temperature
Why is the super heater safety valve set to release before the drum safety? -
CORRECT ANSWERS To ensure flow through the super heater
What is the purpose of a steam trap? - CORRECT ANSWERS To drain water
and air
A steam trap utilizes flash steam to open but what comes after for the closing
operation? - CORRECT ANSWERS Impulse
,Pitting in suction areas of a bronze impeller in centrifugal pumps is usually caused by? -
CORRECT ANSWERS (Best answer) Cavitation or (Second Best) Corrosion
What type of pump has no moving parts? - CORRECT ANSWERS Jet pump
Centrifugal boiler feed water pumps are usually equipped with? - CORRECT
ANSWERS Bypass valves
Which condition is the probable cause of centrifugal pump failure to deliver water when
first started? - CORRECT ANSWERS Pump is not primed
Low pressure from metering or proportioning pumps may be caused by? - CORRECT
ANSWERS Rapid wear on plunger
If a centrifugal pump that operates with suction lift becomes air bound you should? -
CORRECT ANSWERS Reprime the pump
An important consideration in the prevention of carryover in a boiler is to? - CORRECT
ANSWERS Control water level
As alkalinity of boiler water increases the water inside the boiler becomes increasingly
_________? - CORRECT ANSWERS Soft
The residue created from chemically treated feed water remains in the boiler thus
increasing the need for? - CORRECT ANSWERS Boiler Blowdown
Grooving and pitting is caused by? - CORRECT ANSWERS Dissolved O2 and
CO2
What test is used to detect corrosive boiler water? - CORRECT ANSWERS
Hardness Test
Chemical which would not be used for the purpose of regeneration of softner and
dematerialize is? - CORRECT ANSWERS Sulfuric acid
Why are continuous blow downs necessary on high make up? - CORRECT ANSWERS
To maintain proper dissolved boiler water solids
Steam seperation is less effective when there is? - CORRECT ANSWERS High
water level in the drum
Soft sludge in the waterside of the boiler can be readily produced by? - CORRECT
ANSWERS Dissolved salts
, Oxygen entrapped in feed water entering the boiler can cause? - CORRECT
ANSWERS Erosion
Non condensable gases and O2 are removed from boiler feed water by? - CORRECT
ANSWERS Dearation
The limitation placed upon acceptable solids in boiler feed water is? - CORRECT
ANSWERS (Not 100% sure) There is no "acceptable" limit
The use of pre heated combustion air increases ____________. - CORRECT
ANSWERS Efficiency
To minimize boiler damage if a water wall tube suddenly fails you should continue feed
water supply and immediately ____________________. - CORRECT ANSWERS
Reduce firing rate of boiler
Boiler water pH should be in what range? - CORRECT ANSWERS 9.0 - 11.0
When air or products of combustion are caused to flow to or through a unit by
maintaining them at pressure above atmospheric the draft system is said to be under
what kind of draft? - CORRECT ANSWERS Force Draft
Air from a boiler fan may be controlled by? - CORRECT ANSWERS Outlet
vanes, inlet vanes and damper
The advantage of a steam atomizing oil burner is that it uses
_________________________. - CORRECT ANSWERS Oil of any viscosity
Furnace refractory spalling in boilers equipped with mechanical fuel atomizers is caused
by thermal shock from what? - CORRECT ANSWERS Rapid uneven heating
A pulsating effect in the furnace of an oil fired boiler could be caused by? - CORRECT
ANSWERS Insufficient combustion air supply
The burner assembly sprayer plate controls the ________________. - CORRECT
ANSWERS Flow of the fuel in the whirling chamber
The primary air flow through the burner register provides air necessary for
_____________. - CORRECT ANSWERS Sustained combustion in the furnace
The boiler superheater raises the temperature of the _________. - CORRECT
ANSWERS Steam leaving the boiler
When the boiler firing rate increases, combustion control does what? - CORRECT
ANSWERS Increases the air first, followed by the fuel
Answers with complete solution2025(Graded
A+)
A desuperheater that is installed in a boiler is used to control.. - CORRECT ANSWERS
Super heated steam temperature
Economizers are finned to.. - CORRECT ANSWERS Increase the rate of heat
for heat transfer
The heat transfer taking place in a surface condenser is accomplished mainly by.. -
CORRECT ANSWERS Conduction
An unfired pressure vessel which is used to transfer heat from one substance to another
is called.. - CORRECT ANSWERS Feed water heater, Evaporator and Oil Cooler
Boiler economizers are primarily used for.. - CORRECT ANSWERS Recovery
heat from flue gas
The main purpose of the deaerator is to.. - CORRECT ANSWERS Eliminate
non-condensable gases
Superheated steam is more efficient because.. - CORRECT ANSWERS
Temperature & Total heat content are increased
A spear boiler feed water pump is equipped with a check valve in the discharge line to...
- CORRECT ANSWERS Permit fast start up by leaving the discharge valve open
Excessive fireside deposits on heating surfaces of a uncontrolled super heated boiler
would be indicated by... - CORRECT ANSWERS Decreased super heater outlet
temperature
Why is the super heater safety valve set to release before the drum safety? -
CORRECT ANSWERS To ensure flow through the super heater
What is the purpose of a steam trap? - CORRECT ANSWERS To drain water
and air
A steam trap utilizes flash steam to open but what comes after for the closing
operation? - CORRECT ANSWERS Impulse
,Pitting in suction areas of a bronze impeller in centrifugal pumps is usually caused by? -
CORRECT ANSWERS (Best answer) Cavitation or (Second Best) Corrosion
What type of pump has no moving parts? - CORRECT ANSWERS Jet pump
Centrifugal boiler feed water pumps are usually equipped with? - CORRECT
ANSWERS Bypass valves
Which condition is the probable cause of centrifugal pump failure to deliver water when
first started? - CORRECT ANSWERS Pump is not primed
Low pressure from metering or proportioning pumps may be caused by? - CORRECT
ANSWERS Rapid wear on plunger
If a centrifugal pump that operates with suction lift becomes air bound you should? -
CORRECT ANSWERS Reprime the pump
An important consideration in the prevention of carryover in a boiler is to? - CORRECT
ANSWERS Control water level
As alkalinity of boiler water increases the water inside the boiler becomes increasingly
_________? - CORRECT ANSWERS Soft
The residue created from chemically treated feed water remains in the boiler thus
increasing the need for? - CORRECT ANSWERS Boiler Blowdown
Grooving and pitting is caused by? - CORRECT ANSWERS Dissolved O2 and
CO2
What test is used to detect corrosive boiler water? - CORRECT ANSWERS
Hardness Test
Chemical which would not be used for the purpose of regeneration of softner and
dematerialize is? - CORRECT ANSWERS Sulfuric acid
Why are continuous blow downs necessary on high make up? - CORRECT ANSWERS
To maintain proper dissolved boiler water solids
Steam seperation is less effective when there is? - CORRECT ANSWERS High
water level in the drum
Soft sludge in the waterside of the boiler can be readily produced by? - CORRECT
ANSWERS Dissolved salts
, Oxygen entrapped in feed water entering the boiler can cause? - CORRECT
ANSWERS Erosion
Non condensable gases and O2 are removed from boiler feed water by? - CORRECT
ANSWERS Dearation
The limitation placed upon acceptable solids in boiler feed water is? - CORRECT
ANSWERS (Not 100% sure) There is no "acceptable" limit
The use of pre heated combustion air increases ____________. - CORRECT
ANSWERS Efficiency
To minimize boiler damage if a water wall tube suddenly fails you should continue feed
water supply and immediately ____________________. - CORRECT ANSWERS
Reduce firing rate of boiler
Boiler water pH should be in what range? - CORRECT ANSWERS 9.0 - 11.0
When air or products of combustion are caused to flow to or through a unit by
maintaining them at pressure above atmospheric the draft system is said to be under
what kind of draft? - CORRECT ANSWERS Force Draft
Air from a boiler fan may be controlled by? - CORRECT ANSWERS Outlet
vanes, inlet vanes and damper
The advantage of a steam atomizing oil burner is that it uses
_________________________. - CORRECT ANSWERS Oil of any viscosity
Furnace refractory spalling in boilers equipped with mechanical fuel atomizers is caused
by thermal shock from what? - CORRECT ANSWERS Rapid uneven heating
A pulsating effect in the furnace of an oil fired boiler could be caused by? - CORRECT
ANSWERS Insufficient combustion air supply
The burner assembly sprayer plate controls the ________________. - CORRECT
ANSWERS Flow of the fuel in the whirling chamber
The primary air flow through the burner register provides air necessary for
_____________. - CORRECT ANSWERS Sustained combustion in the furnace
The boiler superheater raises the temperature of the _________. - CORRECT
ANSWERS Steam leaving the boiler
When the boiler firing rate increases, combustion control does what? - CORRECT
ANSWERS Increases the air first, followed by the fuel
