Stationary Engineering Exam Questions
With Correct Marking Scheme
/. What are the 3 most common fuels used in steam production? - Answer-Natural gas,
fuel oil, coal
/.The intensity of heat is commonly expressed in what? - Answer-Fahrenheit
/.What are the temps that water changes states at? - Answer-32 degrees F and below
for freezing and 212 degrees F and above at normal atmospheric pressure.
/.What is atmospheric pressure? - Answer-The force exerted on a surface by the air
above it as gravity pulls it to earth.
/.The quantity of heat is expressed in what? - Answer-BTU (British thermal unit)
/.What is a BTU (British Thermal Unit)? - Answer-The heat required to raise the
temperature of ONE POUND of WATER by ONE DEGREE Fahrenheit.
/.What is PSI? - Answer-The amount of pressure exerted on one square inch
/.What is total force? - Answer-It is the area of a surface multiplied by the pressure
exerted on it.
/.What is MAWP? - Answer-It is the highest legal pressure at which a pressure vessel
can be operated.
/.Where is the MAWP located? - Answer-It is located on the nameplate.
/.What is working pressure? - Answer-It can be meant as MAWP but can also refer to
normal operating pressure.
/.What determines a boilers high/low pressures designation? - Answer-Does not exceed
15 psi/250 degrees F they are not designed to exceed 250 psi internal pressure.
Steam pressure is above 15 psi
/.What is differential pressure? - Answer-It is the difference between 2 pressures.
/.What is a fluid? - Answer-A substance that flows freely, such as a liquid or a gas
/.A fluid will flow from a point of high pressure to low pressure? - Answer-Yes, that is
how a fluid flows
,/.What is the temperature - pressure relationship? - Answer-They are directly
proportional. With an increase in temp. you get an increase in pressure. With a
decrease in temp you get a decrease in pressure. A low density gas at a constant
volume the pressure is proportional to the temp.
/.What is sensible heat? - Answer-Heat that can be sensed or measured with a
thermometer.
/.What is latent heat? - Answer-The heat that is absorbed or released during the phase
change of a substance.
/.What is total heat? - Answer-Is the sum of sensible heat and latent heat. 1150.3 at
normal atmospheric pressure.
/.What is a vacuum? - Answer-A pressure lower than atmospheric pressure.
/.How do you lose your license? - Answer-Drinking on the job, sleeping on the job,
negligence, unsafe work, signing a falsified license application for someone or failure to
renew your license annually.
/.Why should you do rounds? - Answer-So that you can find and correct problems to
prevent breakdowns. Keeping permanent records will make it easy to forecast most
breakdowns.
/.Name and describe 3 types of heat transfer. - Answer-1) radiation- heat transmitted
with no material carrier
2) conduction- heat passed through physical contact.
3) convection- heat that is carried along by a moving body.
/.What is a combustion chamber? - Answer-the area of the boiler where COMPLETE
burning of the fuel occurs
/.What is an internally fired boiler? - Answer-have the grates and combustion chamber
enclosed in a shell.
/.Name 4 types of externally fired boilers - Answer-1) HRT set in brick (2) Heine (3)
some water tube boilers (4) Sterling (5) cast iron set in brick
/.What is a crown sheet? - Answer-Is in a vertical fire tube boiler holds the tubes and is
thicker because it is exposed to the fire.
/.What are four types of internally fired boiler? - Answer-1) HRT (2) scotch marine (3)
sectional boiler (4) locomotive (5) cast-iron package boiler (6) vertical fire tubes
/.What is an externally fired boiler? - Answer-Have the setting including the furnace and
the grates separate and distinct from the boiler shell.
,/.What is a tube sheet? - Answer-It holds the tubes and does not see the fire.
/.Describe a sectional boiler - Answer-The sectional headers are built up of vertical
sections or units. A sufficient number of the sections are clamped together to form the
desired size boiler. They can be carried in piece by piece.
/.What is a superheater. What are the advantages? - Answer-A superheater is a device
used to raise the temp of steam. It delivers dryer steam and dryer steam can be
transmitted long distances with minimal heat loss.
/.What is a radiant type superheater? - Answer-A superheater placed in position to
absorb radiant heat from the furnace by radiation.
/.What is a convection type superheater? - Answer-Is placed in the gas passage usually
in between the first and second pass.
/.What is the third type of superheater? - Answer-It is a combination of convection and
radiant type superheaters
/.What is an economizer - Answer-It is a heat exchanger located in the breaching
between the boiler and stack designed to recover waste heat from the products of
combustion.
/.What is an air pressure-heater? - Answer-Consists of a series of tubes or plates that
have hot gases on one side and incoming air on the other. It increases boiler efficiency.
/.What is a water wall? - Answer-A set of tubes containing boiler water set in the
refractory. They absorb waste heat that would be lost to the refractory. They increase
the capacity of the boiler.
/.what is A.S.M.E. and its purpose?
-----
what code of information is stamped on the boiler?
-----
what is an A.S.M.E. symbol stamp?
-----
where are the code markings found on a boiler? - Answer-American Society of
Mechanical Engineers has written a set of minimum standards for the safe construction
of pressure vessels.
-----
stamped on the boiler shell or a plate attached to the shell will be:
1) model and serial numbers
2) safe working pressure
3) date of manufacture
4) horsepower rating
, 5) square feet of heating surface
6) steam generation in pounds per hour
7) fuel designed for
8) ASME stamp
-----
the ASME symbol stamp will identify the boiler or accessory type.
-----
fire tube boiler - it may be located by the water column near the front right side
water tube boiler - it will be located next to the manhole on the steam drum
/.What is the cross section of a 1" bolt? - Answer-DxDx.7854(1/4 of PI). 1x1x .7854=
.7854
/.What is a metal alloy? - Answer-A mixture of two or more metals
/.Name 5 metal alloys? - Answer-Brass, pewter, steel, bronze, cast-iron, stainless steel,
Babbitt, bell metal, and monel
/.At what pressure is the use of cast iron fittings permitted? - Answer-Not to exceed 15
psi or 250F
/.What is meant by factor of safety? - Answer-The comparison of the tensile strength to
the actual working stress. The bursting pressure divided by the maximum allowable
working pressure.
/.What is the factor of safety for boilers, flywheels, and pipe? - Answer-New boilers is 4
Pre-owned boilers constructed to ASME code is 5
Flywheels is 4
Pipe is 8
/.What is a lap joint? - Answer-A joint where 2 parts overlap each other
/.What is a butt joint? - Answer-A joint where two parts are connected by placing them
next to each other
/.What is a butt strap joint? - Answer-Is when 2 ends of the plate meet end to end and
are joined by a plate. One plate is a single butt and 2 plates is a double butt.
/.is the longitudinal joint the strongest part of the boiler - Answer-No, it is only the
strongest type of joint, but any joint is the weakest part of a boiler.
/.2 boilers are made of the same grade of steel, same thickness of plate, and same
joints. One is 30" in diameter and one is 60" in diameter, which one will stand the
greatest working pressure and demonstrate your answer. - Answer-
30x30x.7854x120psi = 84,823 total pounds of pressure
60x60x.7854x120psi=339,292 total pounds of pressure
With Correct Marking Scheme
/. What are the 3 most common fuels used in steam production? - Answer-Natural gas,
fuel oil, coal
/.The intensity of heat is commonly expressed in what? - Answer-Fahrenheit
/.What are the temps that water changes states at? - Answer-32 degrees F and below
for freezing and 212 degrees F and above at normal atmospheric pressure.
/.What is atmospheric pressure? - Answer-The force exerted on a surface by the air
above it as gravity pulls it to earth.
/.The quantity of heat is expressed in what? - Answer-BTU (British thermal unit)
/.What is a BTU (British Thermal Unit)? - Answer-The heat required to raise the
temperature of ONE POUND of WATER by ONE DEGREE Fahrenheit.
/.What is PSI? - Answer-The amount of pressure exerted on one square inch
/.What is total force? - Answer-It is the area of a surface multiplied by the pressure
exerted on it.
/.What is MAWP? - Answer-It is the highest legal pressure at which a pressure vessel
can be operated.
/.Where is the MAWP located? - Answer-It is located on the nameplate.
/.What is working pressure? - Answer-It can be meant as MAWP but can also refer to
normal operating pressure.
/.What determines a boilers high/low pressures designation? - Answer-Does not exceed
15 psi/250 degrees F they are not designed to exceed 250 psi internal pressure.
Steam pressure is above 15 psi
/.What is differential pressure? - Answer-It is the difference between 2 pressures.
/.What is a fluid? - Answer-A substance that flows freely, such as a liquid or a gas
/.A fluid will flow from a point of high pressure to low pressure? - Answer-Yes, that is
how a fluid flows
,/.What is the temperature - pressure relationship? - Answer-They are directly
proportional. With an increase in temp. you get an increase in pressure. With a
decrease in temp you get a decrease in pressure. A low density gas at a constant
volume the pressure is proportional to the temp.
/.What is sensible heat? - Answer-Heat that can be sensed or measured with a
thermometer.
/.What is latent heat? - Answer-The heat that is absorbed or released during the phase
change of a substance.
/.What is total heat? - Answer-Is the sum of sensible heat and latent heat. 1150.3 at
normal atmospheric pressure.
/.What is a vacuum? - Answer-A pressure lower than atmospheric pressure.
/.How do you lose your license? - Answer-Drinking on the job, sleeping on the job,
negligence, unsafe work, signing a falsified license application for someone or failure to
renew your license annually.
/.Why should you do rounds? - Answer-So that you can find and correct problems to
prevent breakdowns. Keeping permanent records will make it easy to forecast most
breakdowns.
/.Name and describe 3 types of heat transfer. - Answer-1) radiation- heat transmitted
with no material carrier
2) conduction- heat passed through physical contact.
3) convection- heat that is carried along by a moving body.
/.What is a combustion chamber? - Answer-the area of the boiler where COMPLETE
burning of the fuel occurs
/.What is an internally fired boiler? - Answer-have the grates and combustion chamber
enclosed in a shell.
/.Name 4 types of externally fired boilers - Answer-1) HRT set in brick (2) Heine (3)
some water tube boilers (4) Sterling (5) cast iron set in brick
/.What is a crown sheet? - Answer-Is in a vertical fire tube boiler holds the tubes and is
thicker because it is exposed to the fire.
/.What are four types of internally fired boiler? - Answer-1) HRT (2) scotch marine (3)
sectional boiler (4) locomotive (5) cast-iron package boiler (6) vertical fire tubes
/.What is an externally fired boiler? - Answer-Have the setting including the furnace and
the grates separate and distinct from the boiler shell.
,/.What is a tube sheet? - Answer-It holds the tubes and does not see the fire.
/.Describe a sectional boiler - Answer-The sectional headers are built up of vertical
sections or units. A sufficient number of the sections are clamped together to form the
desired size boiler. They can be carried in piece by piece.
/.What is a superheater. What are the advantages? - Answer-A superheater is a device
used to raise the temp of steam. It delivers dryer steam and dryer steam can be
transmitted long distances with minimal heat loss.
/.What is a radiant type superheater? - Answer-A superheater placed in position to
absorb radiant heat from the furnace by radiation.
/.What is a convection type superheater? - Answer-Is placed in the gas passage usually
in between the first and second pass.
/.What is the third type of superheater? - Answer-It is a combination of convection and
radiant type superheaters
/.What is an economizer - Answer-It is a heat exchanger located in the breaching
between the boiler and stack designed to recover waste heat from the products of
combustion.
/.What is an air pressure-heater? - Answer-Consists of a series of tubes or plates that
have hot gases on one side and incoming air on the other. It increases boiler efficiency.
/.What is a water wall? - Answer-A set of tubes containing boiler water set in the
refractory. They absorb waste heat that would be lost to the refractory. They increase
the capacity of the boiler.
/.what is A.S.M.E. and its purpose?
-----
what code of information is stamped on the boiler?
-----
what is an A.S.M.E. symbol stamp?
-----
where are the code markings found on a boiler? - Answer-American Society of
Mechanical Engineers has written a set of minimum standards for the safe construction
of pressure vessels.
-----
stamped on the boiler shell or a plate attached to the shell will be:
1) model and serial numbers
2) safe working pressure
3) date of manufacture
4) horsepower rating
, 5) square feet of heating surface
6) steam generation in pounds per hour
7) fuel designed for
8) ASME stamp
-----
the ASME symbol stamp will identify the boiler or accessory type.
-----
fire tube boiler - it may be located by the water column near the front right side
water tube boiler - it will be located next to the manhole on the steam drum
/.What is the cross section of a 1" bolt? - Answer-DxDx.7854(1/4 of PI). 1x1x .7854=
.7854
/.What is a metal alloy? - Answer-A mixture of two or more metals
/.Name 5 metal alloys? - Answer-Brass, pewter, steel, bronze, cast-iron, stainless steel,
Babbitt, bell metal, and monel
/.At what pressure is the use of cast iron fittings permitted? - Answer-Not to exceed 15
psi or 250F
/.What is meant by factor of safety? - Answer-The comparison of the tensile strength to
the actual working stress. The bursting pressure divided by the maximum allowable
working pressure.
/.What is the factor of safety for boilers, flywheels, and pipe? - Answer-New boilers is 4
Pre-owned boilers constructed to ASME code is 5
Flywheels is 4
Pipe is 8
/.What is a lap joint? - Answer-A joint where 2 parts overlap each other
/.What is a butt joint? - Answer-A joint where two parts are connected by placing them
next to each other
/.What is a butt strap joint? - Answer-Is when 2 ends of the plate meet end to end and
are joined by a plate. One plate is a single butt and 2 plates is a double butt.
/.is the longitudinal joint the strongest part of the boiler - Answer-No, it is only the
strongest type of joint, but any joint is the weakest part of a boiler.
/.2 boilers are made of the same grade of steel, same thickness of plate, and same
joints. One is 30" in diameter and one is 60" in diameter, which one will stand the
greatest working pressure and demonstrate your answer. - Answer-
30x30x.7854x120psi = 84,823 total pounds of pressure
60x60x.7854x120psi=339,292 total pounds of pressure
