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3rd grade engineers license test questions and answers
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3rd grade engineers license test questions and answers
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Y3RD GRADE ENGINEERS LICENSETEST QUESTIONS AND ANSWERS
GRADED A+
How can you lose your license? - Not paying your renewal fee,
Drinking on the job,
Leaving boilers unattended,
Falsifying application,
Sleeping on the job.
What must you do if you change jobs? - Notify city of address,
Retirement,
Notify of job change,
Why should you do rounds? - Keeping plant online and operating efficiently and
Maintaining accurate and complete records (know past boiler performance).
What's a steam boiler? - A steam boiler is a closed vessel in which water is transformed into steam under
pressure through application of heat.
What are the requirements of a good boiler? - Adequate steam and water space,
Designed to accommodate expansion and contraction
Efficiently,
Accessible for cleaning and repairs,
Responsive to demands of steam safety.
,Name and describe three types of heat transfer used in boiler operation. - Convection - Heat
Transfer occurring by a medium such as air. (Furnace air is the
transfer of heat from a hotter body to a colder body.)
Radiation - heat transfer Without the aid of physical contact or a conveying medium (Sun heats
by radiation.)
Conduction Is the transfer of heat by actual physical contact. (A Cup is heated by
coffee.)
What's a combustion chamber? - Area of boiler where complete burning of fuel occurs.
What is an interally fired boiler? Name four types. - The grate and combustion chamber are enclosed
within the boiler shell.
1. Locomotive 2. Vertical fire tube
3. Scotch marine 4. Cast iron package "pork chop boiler"
What is an externally fired boiler? Name four types - The grates and combustion chamber are separated
and distinct from the boiler shell.
1.HRT brick water - Sterling
2. Watertube
3. Dutchoven 4. Heine
What is a crown sheet and its purpose? What is a tube sheet and its purpose? - A crown sheet holds the
ends of the tubes and sees the fire.
A tube sheet holds the tubes and does not see the fire. The crown sheet is made
thicker
What's a water leg on a boiler? - A water leg is the space between the outer shell and furnace shell
containing water.
,(These are flat surfaces and have to be stayed. It absorbs waste heat and increases
boiler capacity.)
Is a HRT boiler set level or inclined and why? Are HRT boiler tubes set level or
inclined and why? - HRT boilers are installed inclined or sloped so that the rear of the boiler is "1 - 3"
lower from front to rear.
Boiler tubes are just inclined in the boiler shell. This allows sludge and impurities to
settle to the rear, where they can be drained.
Name two ways to support and take care of expansion of a HRT boiler. Which is
best? - HRT boilers may be supported by the "lug and roller" method or the overhead
suspension method
The sling method has the advantage of removing the weight of the boiler from the
brick work.
What is a longitudinal joint? What is a circumferential joint? - A longitudinal joint runs along the length
of a boiler drum or shell.
A circumferential joint is a lap joint that runs around the circumference of the boiler
drum
What is the difference between a flue and a tube? - Flues are specified by inside diameter (ID.) They are
larger than 4".
Tubes are specified by outside diameter (OD.) They are less than 4".
What is a dry pipe and where is it located? - Dry pipe is an upside down T-shaped pipe connected to the
main steam outlet. A
dry pipe is a steam separator in the steam space and connecled to the main steam
outlet. Its upper surface is perforated. Steam enters the perforations rapidly
changing its direction of flow before entering the steam outlet. This causes droplets
, and impurities to be separated from the steam.
What is a scotch marine boiler and how is it fired? - Scotch marine boiler is an internally fired fire tube
boiler that has a flue furnace and
a horizontal shell. SMR is either oil or gas fired.
How is a Stirling boiler suspended? - lugs on the ends of the upper drums rest on the beams of its
structure. the lower (MUD) drum is suspended from the tubes and is free to move by expansion.
Describe the circulation of water within the Stirling boiler. - 1 Intake through the steam drum,
2. Down the rear tubes to the mud drum
3. Up the front tubes to the intermediate drum
.4 Up to steam drum
5. Out the steam header and back down the tubes
The circulator tubes allows the boiler water to pass between the drums.
What provisions are made for tube removal on water tube boilers? - Tubes are staggered; sometimes
every other row is omitted.
What is a water tube boiler? What are 5 advantages and 5 disadvantages of a water
tube boiler? Name 4 types of water tube boilers. - A water tube boiler is a boiler in which water passes
through tubes surrounded by
products of combustion.
Advantages:
Rapid steam
Use less water
Less chance of explosion
No flat surfaces
Smaller tube sizes, etc.
Efficient
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