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Boma hvac Questions with 100% Actual correct answers | verified | latest update | Graded A+ | Already Passed | Complete Solution

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Boma hvac Questions with 100% Actual correct answers | verified | latest update | Graded A+ | Already Passed | Complete Solution

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  • June 19, 2024
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  • 2023/2024
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  • boma hvac questions with 100 actual correct answe

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Boma hvac
✅✅
(T/F) A Compressor raises the pressure and lowers the temperature of the
refrigerant - -False

3 laws dealing with hvac -✅✅-Boyles , Charles, and daltons
A btu is the amount of heat required to change - ✅✅-One pound of water
one degree Fahrenheit

A current magnetic relay opens and closes based on - ✅✅-The current in
the run winding

✅✅-High stability
A desirable physical property of refrigerant is -

A direct expansion - type evaporator is also called a - ✅✅-dry-type
evaporator

A direct expansion type evaporator is also called a - ✅✅-Dry type
evaporator

A fluid is anything that - ✅✅-Flows
A least likely cause of head pressure problems is a - ✅✅-An oversized
cooling tower

A psychrometric chart is a graphic representation of - ✅✅-Thermodynamic
properties

A psychrometric chart is a graphic representation of - ✅✅-Thermodynamic
properties

A pump out unit is used to - ✅✅-Transfer refrigerant from the machine to an
external source

A rotary compressor is what type - ✅✅-Positive displacement compressor
A sensing bulb for a txv should not be Installed ? - ✅✅-On a fitting in a trap
or pocket or on the bottom of the line

,a shell and tube transfers heat - ✅✅-Outside of the tubes to the inside
✅✅
A split phase motor can use what to energize and de-energize the start
winding ? - -Potential relay, current relay, and a centrifugal switch


✅✅
A system which application of heat is the secondary process is -
-Terminal reheat

A systematic check of a cooling unit is - ✅✅-Check the evaporator coil,
condensate pan, tubing for signs of oil leaks, and the electrical wiring

A thermometer indicates - ✅✅-Sensible heat
A ton of refrigeration is equal to - ✅✅-288,000 BTU / 24 hours

A typical evaporator operating temperature in an ac system is - ✅✅-40
degrees Fahrenheit


✅✅
A typical super heat for an evaporator operating under normal conditions
would be - -8 to 12 degrees


✅✅
Acceptable range of resistance to ground when megahoming -
-1000/ohms/volt


✅✅
Adding a small amount of refrigerant to an undercharged system will cause -
-Rise in head pressure


✅✅
Air comes from a hot duct and a cold duct that is supplied by mixing terminals
is called - -Dual duct system

Air conditioning is the control of - ✅✅-Temperature, humidity, purity, and
distribution of the air

Air flow through a duct has highest velocity near - ✅✅-The center of the duct
✅✅
An ac system that provides complete sensible heating and cooling and latent
heat utilization is what type of system - -All air system / all air heat pump

An example of an axial flow fan is - ✅✅-A propeller fan

, An oil safety switch is operated by what - ✅✅-The difference between oil
pressure and crankcase pressure

At a constant pressure, the volume of a gas varies as to the absolute

✅✅
temperature and at a constant volume the pressure of the gas varies directly
with the absolute temperature. This is known as - -Charles law


✅✅
At what locations in a refrigeration system does the saturation pressure
correspond to the saturation temperature - -Evaporator and condenser

Atmospheric pressure at sea level is - ✅✅-29.92" hg


✅✅
Calculations involving heat loads of people take into consideration heat due to
- -Latent heat and sensible heat


✅✅
Can the performance of a fan at various speeds and air densities be predicted
?- -Yea through fan curve calculations

✅✅-A VFD
Capacity control on a chiller is by use of -

Centrifugal compressor is what type - ✅✅-Dynamic

Chillers use what type of compressor - ✅✅-Centrifugal compressor with a
turbine type impeller wheel

✅✅-Ratio of absolute suction and discharge pressure
Compression ratio is -

Compressor motor and condenser fan motor are wired - ✅✅-Parallel


✅✅
Condensing units draw the most amperage when the suction pressure is -
-30 psi

Conductance is a term used to denote heat flow through - ✅✅-Non
homogeneous material

Conduction heat is transferred by - ✅✅-Contact
Convection heat is transferred by - ✅✅-Movement of water fluid or air

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