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WorksheetsBoiler Practice
Total questions: 34
Worksheet time: 20mins
Water freezes at ______ on the Fahrenheit scale?
212
0
100
32
Water boils at ______ degrees Fahrenheit.
200
100
212
210
What is the function of a boiler?
to heat water to make steam
to heat water to make spaghetti
to transform liquid into a mist
to mix air and fuel
When taking over a shift, the boiler operator must first check the ___.
steam pressure
fuel oil supply
water level on all boilers
bottom blowdown valves
What is the function of the burners in boilers?
Burners inject a mixture of fuel and air into the combustion area of a boiler.
Burners are needed to change the liquid oil to a mist.
Burners transfer heat through electromagnetic waves
Fire tube boilers route (send) combustion gases through a series of tubes to transfer heat to water, thus producing steam.
true
false
Where is steam produced in a typical water tube boiler?
Steam is produced in the water tubes that surround the combustion area of the boiler.
In a pot over an open fire.
At the base of the boiler so the water can not spill out.
In water tube boilers ___________
water passes through the tubes which are surrounded by flames and hot gases
the flames and hot gases pass through the tubes which are surrounded by water
Draft is measured in ___.
pounds per square inch
inches of water column
tenths of an inch of mercury
ounces per square inch
Mechanical draft is produced by ___.
the height of the chimney
the diameter of the chimney
power-driven fans
steam jets
The induced draft fan is located ___.
between the burner and the chimney
inside the air preheater
at the burner
in the first pass of the gases of combustion
The oldest form of draft used in a boiler is ___ draft.
mechanical
natural
forced
combination
The amount of draft produced in a natural draft system depends on the ___.
diameter of the chimney
height of the chimney
amount of flyash in the gases of combustion
types of fans used
When an insufficient (not enough) amount of air is supplied to a boiler, unburned fuel can create _________ deposits.
soot
scale
stoker
draft
Dense (thick) white smoke leaving the stack in an indication that too much _____ is being supplied to the boiler.
soot
air
fuel
scale
The flow of air and other gases through a boiler is commonly referred to as ________.
soot
scale
draft
Which of the following is the proper method for testing a low water cut off device on a steam heating boiler?
Lower the water level in the boiler until the alarm rings
Lower the water level in the boiler until the burner shuts down
Shut off the fuel to the boiler
Test the water column with the test gauge
Which of the following is not a classification of a hot water system?
a two pipe reverse return system
a hartford loop system
a one pipe system
a two pipe direct return system
Safety valves are designed to operate in what fashion(way)?
open to break the cycle to prevent a flame-out
open slowly to prevent water hammer and burning
to pop open
to be opened only by hand when off-line
What chemical would be used to control alkalinity in a boiler?
caustic soda
sodium sulfate
phosphate
sodium sulfite
Which of the following types of similarly sized valves requires the most manual valve stem rotation to move from fully open to fully closed? (Assume each valve has a non-rising stem)
butterfly
ball
plug
gate
In order to reduce the viscosity of fuel oil, it is necessary to ____.
decrease its temperature
decrease its pour point
increase its temperature
decrease its pressure
What is the maximum temperature allowed on all low pressure heating boilers?
200 degrees F
250 degrees F
212 degrees F
175 degrees F
What ASME code are heating boilers built to?
ASME Code, Section V
ASME Code, Section VI
ASME Code, Section IV
ASME Code, Section II
The ASME Code states that the setting on the high limit pressure control on a low pressure steam boiler shall not exceed:
12 psig
10 psig
15 psig
18 psig
Boiler water pH requirements vary, but the pH value of boiler water typically should be maintained between ___ to prevent scale formation.
5 and 7.5
8 ad 10.5
10 and 11.5
12 and 14.5
________is the transfer of heat through a solid object, or between two objects, as a result of physical contact.
Conduction
Convection
Radiation
It is an extremely high-temperature vapor generated by heating the saturated steam obtained by boiling water.
Superheated Steam
Saturated Steam
Unsaturated Steam
Vapor
_______ is the transfer of heat within a fluid, that is a liquid or gas. It is caused by a mixing action within a fluid.
Conduction
Convection
Radation
Combustion
The three ingredients needed to start a fire are fuel, heat, and ___.
carbon dioxide
combustible material
nitrogen
oxygen
Soot accumulation during combustion
Will cause and increase in efficiency
will have no effect on efficiency
will cause a decrease in efficiency
none of the above
Scale accumulation on the inside of a boiler can lead to
A decrease in heat transfer
An increase in heat transfer
Will stop all heat transfer
All of the above
