Boiler Operator Licensing Exam Questions and
Answers
all steam boilers must have - CORRECT ANSWER- 1 or more safety valves
before anyone enters the boiler drum, the main steam stop valve, bottom blowdown
valves, & feedwater valves should be - CORRECT ANSWER- Locked closed
at atmospheric pressure, water begins to boil at approximately - CORRECT ANSWER-
212 degrees F
fuels most commonly used in boilers - CORRECT ANSWER- Fuel oil, gas, & coal
must be connected to the highest part of the steam side of the boiler - CORRECT
ANSWER- Steam pressure gauge
with an NOWL in a boiler, the gauge glass is approximately - CORRECT ANSWER-
Half full
a high surface tension on top of the boiler water can lead to - CORRECT ANSWER-
Foaming
Bottom blowdown on a boiler removes sludge & sediment from the - CORRECT
ANSWER- Mud drum
a boiler fusible plug is brass or bronze with a core of - CORRECT ANSWER- Tin
a steam pressure gauge is calibrated in - CORRECT ANSWER- Pounds per square
inch
a secondary means of determining boiler water level - CORRECT ANSWER- Try cocks
fires caused by spontaneous combustion are most likely to occur in the - CORRECT
ANSWER- Oily waste rag storage
a siphon installed between the boiler & the pressure gauge protects the Bourdon tube
from - CORRECT ANSWER- Steam
boiler feedwater is chemically treated to - CORRECT ANSWER- Prevent formation of
scale
, in a firetube boiler, soot accumulates on the - CORRECT ANSWER- Inside tube surface
the pressure applied on the boiler during a hydrostatic test should be - CORRECT
ANSWER- 1.5 times the MAWP
as fuel oil is heated, its viscosity is - CORRECT ANSWER- Decreased
the induced draft fan is located between the boiler & the - CORRECT ANSWER-
Chimney
the flash point of fuel oil is the minimum temperature at which the fuel will - CORRECT
ANSWER- Flash when exposed to an open flame
the fire point of fuel oil is the minimum temperature at which the fuel will - CORRECT
ANSWER- Burn continually
the pour point of fuel oil is the ____ temperature at which fuel oil will ____ - CORRECT
ANSWER- Lowest; flow
fuel oil with a low flash point is - CORRECT ANSWER- Dangerous to handle
the operating range of a steam boiler is controlled by a - CORRECT ANSWER-
Pressure control
water hammer in steam lines is caused by - CORRECT ANSWER- Condensate in the
line
measures the difference in pressure between 2 points, measures draft - CORRECT
ANSWER- Manometer
the best time to blowdown a boiler is when it is at its - CORRECT ANSWER- Lowest
load
Boilers that are laid up dry have trays of ____ put in the steam & water drums to absorb
moisture - CORRECT ANSWER- Silica gel
required to obtain complete combustion of a fuel - CORRECT ANSWER- Mixture;
atomization; temperature; time
Answers
all steam boilers must have - CORRECT ANSWER- 1 or more safety valves
before anyone enters the boiler drum, the main steam stop valve, bottom blowdown
valves, & feedwater valves should be - CORRECT ANSWER- Locked closed
at atmospheric pressure, water begins to boil at approximately - CORRECT ANSWER-
212 degrees F
fuels most commonly used in boilers - CORRECT ANSWER- Fuel oil, gas, & coal
must be connected to the highest part of the steam side of the boiler - CORRECT
ANSWER- Steam pressure gauge
with an NOWL in a boiler, the gauge glass is approximately - CORRECT ANSWER-
Half full
a high surface tension on top of the boiler water can lead to - CORRECT ANSWER-
Foaming
Bottom blowdown on a boiler removes sludge & sediment from the - CORRECT
ANSWER- Mud drum
a boiler fusible plug is brass or bronze with a core of - CORRECT ANSWER- Tin
a steam pressure gauge is calibrated in - CORRECT ANSWER- Pounds per square
inch
a secondary means of determining boiler water level - CORRECT ANSWER- Try cocks
fires caused by spontaneous combustion are most likely to occur in the - CORRECT
ANSWER- Oily waste rag storage
a siphon installed between the boiler & the pressure gauge protects the Bourdon tube
from - CORRECT ANSWER- Steam
boiler feedwater is chemically treated to - CORRECT ANSWER- Prevent formation of
scale
, in a firetube boiler, soot accumulates on the - CORRECT ANSWER- Inside tube surface
the pressure applied on the boiler during a hydrostatic test should be - CORRECT
ANSWER- 1.5 times the MAWP
as fuel oil is heated, its viscosity is - CORRECT ANSWER- Decreased
the induced draft fan is located between the boiler & the - CORRECT ANSWER-
Chimney
the flash point of fuel oil is the minimum temperature at which the fuel will - CORRECT
ANSWER- Flash when exposed to an open flame
the fire point of fuel oil is the minimum temperature at which the fuel will - CORRECT
ANSWER- Burn continually
the pour point of fuel oil is the ____ temperature at which fuel oil will ____ - CORRECT
ANSWER- Lowest; flow
fuel oil with a low flash point is - CORRECT ANSWER- Dangerous to handle
the operating range of a steam boiler is controlled by a - CORRECT ANSWER-
Pressure control
water hammer in steam lines is caused by - CORRECT ANSWER- Condensate in the
line
measures the difference in pressure between 2 points, measures draft - CORRECT
ANSWER- Manometer
the best time to blowdown a boiler is when it is at its - CORRECT ANSWER- Lowest
load
Boilers that are laid up dry have trays of ____ put in the steam & water drums to absorb
moisture - CORRECT ANSWER- Silica gel
required to obtain complete combustion of a fuel - CORRECT ANSWER- Mixture;
atomization; temperature; time
