HVAC Final Exam Electrical For Air Conditioning common
Questions with Answers Rated A+
What device is added to a oil or gas forced hot air system when it is not AC ready?
Select one:
a. Fan limit switch
b. Fan Center
c. Multi Stage Thermostat
d. Mars Relay
b. Fan Center
When a technician is taking an ohm reading across an open switch what should the reading be?
Select one:
a. 0
b. OL
c. Source Voltage
d. Some Number
b. OL
What does the "Y" terminal connect to on a wall mounted low voltage T-stat?
Select one:
a. Outdoor fan relay
b. Cooling Contactor
c. Primary side of transformer
d. Indoor fan relay
b. Cooling Contactor
In a transformer the ______________________ winding is the windings to which voltage is supplied and
is considered the load side of the transformer.
Select one:
a. primary
b. secondary
c. start
Page | 1
,d. run
a. primary
What would be the cause of a transformer failure?
Select one:
a. Compressor amps too high for circuit
b. Overloading the control circuit
c. Underloading the control circuit
d. None of the above
b. Overloading the control circuit
What does the "G" terminal control on a low voltage wall mounted T-sat?
Select one:
a. Outdoor fan Relay
b. Cooling Relay
c. Indoor fan Relay
d. Heat Relay
c. Indoor fan Relay
Contactors are rated according to the maximum amperage through the;
Select one:
a. coil
b. contacts
c. thermostat
d. fuse
b. contacts
A cooling thermostat ___________________________.
Select one:
a. opens on temp. rise
b. closes on temp. rise
b. closes on temp. rise
Page | 2
,When ohming out a load what reading should the technician get?
Select one:
a. 0
b. OL
c. Some Number
d. Source Voltage
c. Some Number
When a technician is taking a volt reading across a closed switch in an energized circuit what should the
reading be?
Select one:
a. 0
b. OL
c. Source Voltage
d. Infinity
a. 0
When a technician is taking a volt reading across an open switch in an energized circuit what should the
reading be?
Select one:
a. 0
b. OL
c. Source Voltage
d. Infinity
c. Source Voltage
Most thermostats in the HVAC industry are 120 volts.
Select one:
True
False
False
Where does the "R" terminal of a thermostat connect to?
Page | 3
, Select one:
a. transformer secondary
b. transformer primary
c. relay
d. fan motor
a. transformer secondary
What is the term used to descibe the output side of a transformer?
Select one:
a. Low inductive side
b. High inductive side
c. Primary side
d. Secondary side
d. Secondary side
Snap action contact points are often used in controlling instruments to ____.
Select one:
a. decrease noise
b. prevent electrical arcing
c. maintain desired condition
d. prevent motor from overheating
e. replace any relays
b. prevent electrical arcing
In a transformer the ______________________ winding is the windings to which the output voltage is
supplied and is considered the source side of the transformer.
Select one:
a. primary
b. secondary
c. run
d. start
b. secondary
Page | 4
Questions with Answers Rated A+
What device is added to a oil or gas forced hot air system when it is not AC ready?
Select one:
a. Fan limit switch
b. Fan Center
c. Multi Stage Thermostat
d. Mars Relay
b. Fan Center
When a technician is taking an ohm reading across an open switch what should the reading be?
Select one:
a. 0
b. OL
c. Source Voltage
d. Some Number
b. OL
What does the "Y" terminal connect to on a wall mounted low voltage T-stat?
Select one:
a. Outdoor fan relay
b. Cooling Contactor
c. Primary side of transformer
d. Indoor fan relay
b. Cooling Contactor
In a transformer the ______________________ winding is the windings to which voltage is supplied and
is considered the load side of the transformer.
Select one:
a. primary
b. secondary
c. start
Page | 1
,d. run
a. primary
What would be the cause of a transformer failure?
Select one:
a. Compressor amps too high for circuit
b. Overloading the control circuit
c. Underloading the control circuit
d. None of the above
b. Overloading the control circuit
What does the "G" terminal control on a low voltage wall mounted T-sat?
Select one:
a. Outdoor fan Relay
b. Cooling Relay
c. Indoor fan Relay
d. Heat Relay
c. Indoor fan Relay
Contactors are rated according to the maximum amperage through the;
Select one:
a. coil
b. contacts
c. thermostat
d. fuse
b. contacts
A cooling thermostat ___________________________.
Select one:
a. opens on temp. rise
b. closes on temp. rise
b. closes on temp. rise
Page | 2
,When ohming out a load what reading should the technician get?
Select one:
a. 0
b. OL
c. Some Number
d. Source Voltage
c. Some Number
When a technician is taking a volt reading across a closed switch in an energized circuit what should the
reading be?
Select one:
a. 0
b. OL
c. Source Voltage
d. Infinity
a. 0
When a technician is taking a volt reading across an open switch in an energized circuit what should the
reading be?
Select one:
a. 0
b. OL
c. Source Voltage
d. Infinity
c. Source Voltage
Most thermostats in the HVAC industry are 120 volts.
Select one:
True
False
False
Where does the "R" terminal of a thermostat connect to?
Page | 3
, Select one:
a. transformer secondary
b. transformer primary
c. relay
d. fan motor
a. transformer secondary
What is the term used to descibe the output side of a transformer?
Select one:
a. Low inductive side
b. High inductive side
c. Primary side
d. Secondary side
d. Secondary side
Snap action contact points are often used in controlling instruments to ____.
Select one:
a. decrease noise
b. prevent electrical arcing
c. maintain desired condition
d. prevent motor from overheating
e. replace any relays
b. prevent electrical arcing
In a transformer the ______________________ winding is the windings to which the output voltage is
supplied and is considered the source side of the transformer.
Select one:
a. primary
b. secondary
c. run
d. start
b. secondary
Page | 4
