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Boiler Exam Practice Tests
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Boiler Exam Practice Tests
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Boiler Exam Practice Tests1 - ANS-According to the ASME Code, the minimum size pipe connecting the water
column to the boiler is ___".
1 - ANS-When economizers are used to heat boiler feedwater, every 10°F rise in
feedwater temperature is accompanied by a ___% savings in fuel.
1 ½ - ANS-The pressure applied on the boiler during a hydrostatic test is ___ times the
MAWP.
1 ½ - ANS-The range of a boiler pressure gauge must not be less than ___ times the
safety valve setting.
1 ½ times the MAWP - ANS-When making a hydrostatic test on a boiler, the pressure is
___.
1 ½ to 2 times the safety valve setting - ANS-According to the ASME code, the
suggested range of a boiler pressure gauge is ___.
10 to 11.5 - ANS-The pH of the boiler water should be ___.
100 - ANS-If three boilers are connected to a common header and each boiler is at 100
psi, the master gauge on the header would read ___ psi.
100,000; therm - ANS-The Btu content of natural gas is ___ Btu per ___.
15 psi to 25 psi - ANS-When warming up a boiler during cold plant startup, the boiler
vent should remain open until the steam pressure reaches approximately ___.
174.7 - ANS-The absolute pressure of a steam boiler carrying 160 psig would be ___
psia.
2 ½ - ANS-According to the ASME Code, the maximum size of the boiler bottom
blowdown line is ___".
34.5 - ANS-At a water temperature of 212°F, 1 BHP is equivalent to the evaporation of
___ lb of water/hour.
,34.5 - ANS-Boiler horsepower is the evaporation of ___ lb of water/hr from and at a
feedwater temperature of 212°F.
500 - ANS-According to the ASME Code, a boiler that has more than ___ sq ft of
heating surface must have two or more safety valves.
6 - ANS-Boiler safety valve capacity must be such that the steam pressure can never go
higher than ___% above the MAWP.
6 - ANS-No. ___ fuel oil has the highest Btu content per gallon.
6% above the MAWP - ANS-With all of the safety valves popping, the boiler pressure
should not go higher than ___.
7 - ANS-Neutral on the pH scale is ___.
a blowdown tank - ANS-Sludge and sediment from the mud drum of a boiler are
discharged into ___.
a broken baffle - ANS-A sudden increase in chimney temperature without a
corresponding increase in steam demand indicates ___.
a dirty heating surface - ANS-A gradual increase in chimney temperature indicates ___.
a high - ANS-Viscosity is the internal resistance of a fluid to flow. No. 6 fuel oil has ___
viscosity.
a high furnace temperature - ANS-For the efficient combustion of pulverized coal, it is
necessary to maintain ___.
a lower pressure than - ANS-The superheater header safety valve is set to pop at ___
the steam and water drum safety valves.
a minimal amount of excess air - ANS-Complete combustion is defined as burning all
fuel using ___.
a mixture of water and steam - ANS-The middle try cock should be mounted at the
NOWL and, when operated, should blow ___.
a rise in chimney temperature - ANS-A broken baffle in a watertube boiler causes ___.
, above the feedwater pump on the suction side - ANS-An open feedwater heater is
located ___.
accumulation - ANS-A(n) ___ test is used to test the relieving capacity of a safety valve.
acts as a flame failure control - ANS-An infrared scanner ___.
alkaline - ANS-Boiler water with a pH of 11 is ___.
allow the setting to cool - ANS-Before draining a boiler, the operator should ___.
an air- or water-driven turbine - ANS-Scale buildup in the tubes of watertube boiler can
be removed by ___.
an internal furnace - ANS-A scotch marine boiler has ___.
Anthracite - ANS-___ coal has the highest amount of fixed carbon.
as a secondary means of determining the water level - ANS-The try cocks on a water
column are used ___.
at its lowest load - ANS-The best time to blow down a boiler is when it is ___.
at least once a shift - ANS-In most plants, the suggested operating procedure is to blow
down the water column and gauge glass ___.
at the NOWL - ANS-The feedwater regulator element is located ___.
at the NOWL - ANS-The surface blowdown on a steam boiler is located ___.
atmospheric - ANS-In a balanced draft system, the pressure in the furnace is
approximately ___.
atmospheric pressure - ANS-A barometer measures ___.
atomize the fuel oil completely - ANS-The function of the fuel oil burner is to ___.
below atmospheric - ANS-In a plant that uses forced draft, the pressure at the base of
the chimney is ___ pressure.
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