MEP Final Exam Prep: Comprehensive Review and Test Strategies
What are the major parts of a forced air heating system - correct answer ✔✔Heating Unit, Distribution
System, Controls
The two primary differences between a central and modular force-air heating system are - correct
answer ✔✔The modular system uses more than one heating unit, where each individual unit is located
in a zone of the building. This is in contrast to the central system which has one furnace in the center of
the building.
5 Parts a furnace possibly includes - correct answer ✔✔Blower, Burner, Heat exchanger or electric
heating elements, controls
Furnaces are categorized based on ? - correct answer ✔✔Direction of the airflow out of the furnace
(Upflow, downflow, horizontal flow)
How do furnaces produce heat? - correct answer ✔✔Combustion or electrical energy
Difference between natural gas and LP gas furnaces are - correct answer ✔✔Size of the orifices
(Openings) or the burner and the pressure of the gas fuel
Where would you find a propeller fan? - correct answer ✔✔Where there is not ductwork and outdoors
on air conditioning condensers
What is a scroll? - correct answer ✔✔A sheet metal enclosure that surrounds the blower wheel
What is a manifold? - correct answer ✔✔A Pipe that has outlets for connecting other pipes?
What is thepurpose of a draft diverter? - correct answer ✔✔Assure a constant draft and eliminate
downdrafts in the flue that owuld affect burner operation.
2 examples of heat exchangers - correct answer ✔✔Clam Shell and drum heat
,Which filters can be used to remove bacteria from air? - correct answer ✔✔electrostatic filters
Waht connects a furnace supply air opening to the supply ductwork? - correct answer ✔✔Supply
Plenum
What is "Throw" in regards to a register? - correct answer ✔✔Distance from the front of the register to
the area of influence
What is "spread" in regard to a register? - correct answer ✔✔Tthe Length and Width distance used to
calculate the area if influence
What is the purpose of a duct heater? - correct answer ✔✔To reheat the air at the point of use
2 types of switches used in thermstats? - correct answer ✔✔open contact and mercury bulb
Which has a damper a register or a grill? - correct answer ✔✔Register
Which carries more Btu's per pound: steam or water? Why - correct answer ✔✔Steam, because of the
additional heat required for phase change. Steam has more latent heat and sensible heat.
What is a deciding factor in locating the boiler? - correct answer ✔✔The location of the air handling
equipment.
What is the function of a "breeching"? - correct answer ✔✔ITs connected to a flue stack. It collects the
hot products of combustion and directs the gases up the stack.
What is Pickup? - correct answer ✔✔additional heat that is needed to warm the water in the hydronic
heating system once a period of off-time has passed.
One kilowatt per hour equals how many Btu's? - correct answer ✔✔Btu's
, What are 2 methods for determining the water level in a boiler? - correct answer ✔✔Try Cocks and
Gauge glass
Why would a bottom blowdown valve be opened on a boiler? - correct answer ✔✔Water level control,
sludge and sediment removal, chemical concentration control, and cumping the boielr.
What does NOWL mean? - correct answer ✔✔Normal Operating Water Level
What is an Aquastat and what does it do? - correct answer ✔✔It is a device that controls the starting
and stopping and fire rate of the burner by sening the temp. of the water in the hot water boiler.
What determines the discharge flow rate of the centrifugal feedwater pump? - correct answer
✔✔Impeller size and speed
What determines the number and size of the circulating pumps for hot water boilers and hydronic
heating systems? - correct answer ✔✔Determined by the volume of the water to be moved and the
resistance to flow in the system.
hoosing between two-pipe piping systems, which system is easier to balance? Why? - correct answer
✔✔Easier to balance the "reverse-return" system because the return water flows in the same direction
as the supply water.
Why are three-pipe systems more exspensive to operate? - correct answer ✔✔Because the hot and cold
water are mixed.
What is a Modulating Valve? - correct answer ✔✔Infinite position valve it can be opened closed or
anywhere between.
What is Deadband? - correct answer ✔✔It is the set point differential when no mechanical heating or
cooling is allowed because the temperature is betwen 2 set points.
What is the direction of heat flow in materials? - correct answer ✔✔From high temp to low temp.
What are the major parts of a forced air heating system - correct answer ✔✔Heating Unit, Distribution
System, Controls
The two primary differences between a central and modular force-air heating system are - correct
answer ✔✔The modular system uses more than one heating unit, where each individual unit is located
in a zone of the building. This is in contrast to the central system which has one furnace in the center of
the building.
5 Parts a furnace possibly includes - correct answer ✔✔Blower, Burner, Heat exchanger or electric
heating elements, controls
Furnaces are categorized based on ? - correct answer ✔✔Direction of the airflow out of the furnace
(Upflow, downflow, horizontal flow)
How do furnaces produce heat? - correct answer ✔✔Combustion or electrical energy
Difference between natural gas and LP gas furnaces are - correct answer ✔✔Size of the orifices
(Openings) or the burner and the pressure of the gas fuel
Where would you find a propeller fan? - correct answer ✔✔Where there is not ductwork and outdoors
on air conditioning condensers
What is a scroll? - correct answer ✔✔A sheet metal enclosure that surrounds the blower wheel
What is a manifold? - correct answer ✔✔A Pipe that has outlets for connecting other pipes?
What is thepurpose of a draft diverter? - correct answer ✔✔Assure a constant draft and eliminate
downdrafts in the flue that owuld affect burner operation.
2 examples of heat exchangers - correct answer ✔✔Clam Shell and drum heat
,Which filters can be used to remove bacteria from air? - correct answer ✔✔electrostatic filters
Waht connects a furnace supply air opening to the supply ductwork? - correct answer ✔✔Supply
Plenum
What is "Throw" in regards to a register? - correct answer ✔✔Distance from the front of the register to
the area of influence
What is "spread" in regard to a register? - correct answer ✔✔Tthe Length and Width distance used to
calculate the area if influence
What is the purpose of a duct heater? - correct answer ✔✔To reheat the air at the point of use
2 types of switches used in thermstats? - correct answer ✔✔open contact and mercury bulb
Which has a damper a register or a grill? - correct answer ✔✔Register
Which carries more Btu's per pound: steam or water? Why - correct answer ✔✔Steam, because of the
additional heat required for phase change. Steam has more latent heat and sensible heat.
What is a deciding factor in locating the boiler? - correct answer ✔✔The location of the air handling
equipment.
What is the function of a "breeching"? - correct answer ✔✔ITs connected to a flue stack. It collects the
hot products of combustion and directs the gases up the stack.
What is Pickup? - correct answer ✔✔additional heat that is needed to warm the water in the hydronic
heating system once a period of off-time has passed.
One kilowatt per hour equals how many Btu's? - correct answer ✔✔Btu's
, What are 2 methods for determining the water level in a boiler? - correct answer ✔✔Try Cocks and
Gauge glass
Why would a bottom blowdown valve be opened on a boiler? - correct answer ✔✔Water level control,
sludge and sediment removal, chemical concentration control, and cumping the boielr.
What does NOWL mean? - correct answer ✔✔Normal Operating Water Level
What is an Aquastat and what does it do? - correct answer ✔✔It is a device that controls the starting
and stopping and fire rate of the burner by sening the temp. of the water in the hot water boiler.
What determines the discharge flow rate of the centrifugal feedwater pump? - correct answer
✔✔Impeller size and speed
What determines the number and size of the circulating pumps for hot water boilers and hydronic
heating systems? - correct answer ✔✔Determined by the volume of the water to be moved and the
resistance to flow in the system.
hoosing between two-pipe piping systems, which system is easier to balance? Why? - correct answer
✔✔Easier to balance the "reverse-return" system because the return water flows in the same direction
as the supply water.
Why are three-pipe systems more exspensive to operate? - correct answer ✔✔Because the hot and cold
water are mixed.
What is a Modulating Valve? - correct answer ✔✔Infinite position valve it can be opened closed or
anywhere between.
What is Deadband? - correct answer ✔✔It is the set point differential when no mechanical heating or
cooling is allowed because the temperature is betwen 2 set points.
What is the direction of heat flow in materials? - correct answer ✔✔From high temp to low temp.
