LA Steam Engineer Test exam Questions and answers.

LA Steam Engineer Test exam Questions and
answers.

A desuperheater that is installed in a boiler is used to control.. - (correct answer) -
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Super heated steam temperature
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Economizers are finned to.. - (correct answer) - Increase the rate of heat for heat transfer
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The heat transfer taking place in a surface condenser is accomplished mainly by.. - (correct answer) -
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Conduction
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An unfired pressure vessel which is used to transfer heat from one substance to another is called.. -
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(correct answer) - Feed water heater, Evaporator and Oil Cooler
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Boiler economizers are primarily used for.. - (correct answer) - Recovery heat from flue gas
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The main purpose of the deaerator is to.. - (correct answer) - Eliminate non-condensable gases
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Superheated steam is more efficient because.. - (correct answer) -
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Temperature & Total heat content are increased
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A spear boiler feed water pump is equipped with a check valve in the discharge line to... -
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(correct answer) - Permit fast start up by leaving the discharge valve open
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Excessive fireside deposits on heating surfaces of a uncontrolled super heated boiler would be indicat
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ed by... - (correct answer) - Decreased super heater outlet temperature
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Why is the super heater safety valve set to release before the drum safety? - (correct answer) -
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To ensure flow through the super heater
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What is the purpose of a steam trap? - (correct answer) - To drain water and air
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A steam trap utilizes flash steam to open but what comes after for the closing operation? -
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(correct answer) - Impulse
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Pitting in suction areas of a bronze impeller in centrifugal pumps is usually caused by? -
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(correct answer) - (Best answer) Cavitation or (Second Best) Corrosion
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What type of pump has no moving parts? - (correct answer) - Jet pump
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Centrifugal boiler feed water pumps are usually equipped with? - (correct answer) - Bypass valves
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, Which condition is the probable cause of centrifugal pump failure to deliver water when first started?
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- (correct answer) - Pump is not primed
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Low pressure from metering or proportioning pumps may be caused by? - (correct answer) -
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Rapid wear on plunger
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If a centrifugal pump that operates with suction lift becomes air bound you should? -
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(correct answer) - Reprime the pump
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An important consideration in the prevention of carryover in a boiler is to? - (correct answer) -
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Control water level
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As alkalinity of boiler water increases the water inside the boiler becomes increasingly _________? -
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(correct answer) - Soft
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The residue created from chemically treated feed water remains in the boiler thus increasing the need
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for? - (correct answer) - Boiler Blowdown
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Grooving and pitting is caused by? - (correct answer) - Dissolved O2 and CO2
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What test is used to detect corrosive boiler water? - (correct answer) - Hardness Test
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Chemical which would not be used for the purpose of regeneration of softner and dematerialize is? -
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(correct answer) - Sulfuric acid
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Why are continuous blow downs necessary on high make up? - (correct answer) -
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To maintain proper dissolved boiler water solids
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Steam seperation is less effective when there is? - (correct answer) - High water level in the drum
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Soft sludge in the waterside of the boiler can be readily produced by? - (correct answer) -
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Dissolved salts
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Oxygen entrapped in feed water entering the boiler can cause? - (correct answer) - Erosion
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Non condensable gases and O2 are removed from boiler feed water by? - (correct answer) -
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Dearation
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The limitation placed upon acceptable solids in boiler feed water is? - (correct answer) -
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(Not 100% sure) There is no "acceptable" limit
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The use of pre heated combustion air increases ____________. - (correct answer) - Efficiency
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To minimize boiler damage if a water wall tube suddenly fails you should continue feed water supply
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and immediately ____________________. - (correct answer) - Reduce firing rate of boiler
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Boiler water pH should be in what range? - (correct answer) - 9.0 - 11.0
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