1|Page
HVAC Final Exam Electrical For Air
Conditioning Exam 2026|Latest
Questions And Answers
When installing a low voltage thermostat you should
Select one:
a. Use color coded wires
b. Plug holes to prevent wall drafts from affecting the thermostat
c. Maintain tight wire connections
d. All of the above - correct-answer -d. All of the above
When checking voltage across a set of contacts while the coil is energized, you
should read....
Select one:
a. 120 volts
b. 0 Ohms
c. 208 volts
d. 0 volts - correct-answer -d. 0 volts
What must be done before taking an ohm reading
,2|Page
Select one:
a. de-energize circuit
b. isolate component
c. set the meter to the proper scale
d. all of the above - correct-answer -d. all of the above
What is the common electrical service to a residential home?
Select one:
a. 240 V single phase 60 Hz
b. 240 V three phase 60 HZ
c. 208 V single phase 60 HZ
d. 240 V single phase 50 Hz - correct-answer -a. 240 V single phase 60 Hz
The voltage draw is more when the motor is starting than when it is running.
Select one:
True
False - correct-answer -True
The starting capacitor is connected in series with the starting winding.
Select one:
,3|Page
True
False - correct-answer -True
The start capacitor must always be removed from the circuit when the motor has
reached ____________ of its rated RPM's
Select one:
a. 10%
b. 25%
c. 50%
d. 75%
e. 95% - correct-answer -d. 75%
What is the definition of a (BTU) British Thermal Unit
Select one:
a. The amount of heat required to raise the temperature of 1 pound of water by 1
degree
b. The amount of heat required to melt a ton of ice
c. The amount of heat required to raise the temperature of 1 ton of water by 1
degree
d. The amount of heat required to raise the temperature of 1 pound of water by
10 degrees - correct-answer -a. The amount of heat required to raise the
temperature of 1 pound of water by 1 degree
, 4|Page
This compressor is small and light weight and uses blades or vanes to move the
refrigerant - correct-answer -Rotary compressor
This compressor is used on large chilled water systems 20 tons and up. It uses the
spacing between the lobes of the screws to compress the refrigerant and will
operate smoothly even when its capacity is reduced to as low as 10%. - correct-
answer -Screw Compressor
This compressor is the newest type of compressor and has no intake or discharge
valves except a check valve on the discharge. It has very little wear and tear
because it has so few moving parts. - correct-answer -Scroll Compressor
This compressor is used in large commercial refrigeration systems over 50 tons. It
uses impellers or wheels and has no valves or pistons and operates at high speeds
- correct-answer -Centrifugal Compressor
This compressor is a piston type compressor used in domestic and commercial
systems - correct-answer -Reciprocating Compressor
HVAC Final Exam Electrical For Air
Conditioning Exam 2026|Latest
Questions And Answers
When installing a low voltage thermostat you should
Select one:
a. Use color coded wires
b. Plug holes to prevent wall drafts from affecting the thermostat
c. Maintain tight wire connections
d. All of the above - correct-answer -d. All of the above
When checking voltage across a set of contacts while the coil is energized, you
should read....
Select one:
a. 120 volts
b. 0 Ohms
c. 208 volts
d. 0 volts - correct-answer -d. 0 volts
What must be done before taking an ohm reading
,2|Page
Select one:
a. de-energize circuit
b. isolate component
c. set the meter to the proper scale
d. all of the above - correct-answer -d. all of the above
What is the common electrical service to a residential home?
Select one:
a. 240 V single phase 60 Hz
b. 240 V three phase 60 HZ
c. 208 V single phase 60 HZ
d. 240 V single phase 50 Hz - correct-answer -a. 240 V single phase 60 Hz
The voltage draw is more when the motor is starting than when it is running.
Select one:
True
False - correct-answer -True
The starting capacitor is connected in series with the starting winding.
Select one:
,3|Page
True
False - correct-answer -True
The start capacitor must always be removed from the circuit when the motor has
reached ____________ of its rated RPM's
Select one:
a. 10%
b. 25%
c. 50%
d. 75%
e. 95% - correct-answer -d. 75%
What is the definition of a (BTU) British Thermal Unit
Select one:
a. The amount of heat required to raise the temperature of 1 pound of water by 1
degree
b. The amount of heat required to melt a ton of ice
c. The amount of heat required to raise the temperature of 1 ton of water by 1
degree
d. The amount of heat required to raise the temperature of 1 pound of water by
10 degrees - correct-answer -a. The amount of heat required to raise the
temperature of 1 pound of water by 1 degree
, 4|Page
This compressor is small and light weight and uses blades or vanes to move the
refrigerant - correct-answer -Rotary compressor
This compressor is used on large chilled water systems 20 tons and up. It uses the
spacing between the lobes of the screws to compress the refrigerant and will
operate smoothly even when its capacity is reduced to as low as 10%. - correct-
answer -Screw Compressor
This compressor is the newest type of compressor and has no intake or discharge
valves except a check valve on the discharge. It has very little wear and tear
because it has so few moving parts. - correct-answer -Scroll Compressor
This compressor is used in large commercial refrigeration systems over 50 tons. It
uses impellers or wheels and has no valves or pistons and operates at high speeds
- correct-answer -Centrifugal Compressor
This compressor is a piston type compressor used in domestic and commercial
systems - correct-answer -Reciprocating Compressor
