HVAC Final Exam Electrical For Air
Conditioning Questions And Correct
Answers
\Q\.When using a low voltage T-stat for heating and cooling, when would there be a jumper
between Rh and Rc?
Select one:
a. When using a single transformer system
b. When heating with an oil boiler
c. When heating with a gas boiler
d. When using a two transformer system - ANSWERS✔-A) When Using a single transformer
system
\Q\.Digital thermostats usually display temperature, time of day, programming and operating
status.
Select one:
True
False - ANSWERS✔-True
\Q\.With the fan switch in the on position, the indoor fan will,,,
Select one:
a. Run in cooling mode
b. run continuously
c. run only when the outdoor unit runs
,d. none of the above - ANSWERS✔-b. run continuously
\Q\.What is the most common type of T-sat in the HVAC industry?
Select one:
a. Line voltage
b. Remote bulb
c. Low voltage
d. None of the above - ANSWERS✔-c. Low voltage
\Q\.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 - ANSWERS✔-b. Fan Center
\Q\.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 - ANSWERS✔-b. OL
\Q\.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 - ANSWERS✔-b. Cooling Contactor
\Q\.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
d. run - ANSWERS✔-a. primary
\Q\.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 - ANSWERS✔-b. Overloading the control circuit
\Q\.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 - ANSWERS✔-c. Indoor fan Relay
, \Q\.Contactors are rated according to the maximum amperage through the;
Select one:
a. coil
b. contacts
c. thermostat
d. fuse - ANSWERS✔-b. contacts
\Q\.A cooling thermostat ___________________________.
Select one:
a. opens on temp. rise
b. closes on temp. rise - ANSWERS✔-b. closes on temp. rise
\Q\.When ohming out a load what reading should the technician get?
Select one:
a. 0
b. OL
c. Some Number
d. Source Voltage - ANSWERS✔-c. Some Number
\Q\.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
Conditioning Questions And Correct
Answers
\Q\.When using a low voltage T-stat for heating and cooling, when would there be a jumper
between Rh and Rc?
Select one:
a. When using a single transformer system
b. When heating with an oil boiler
c. When heating with a gas boiler
d. When using a two transformer system - ANSWERS✔-A) When Using a single transformer
system
\Q\.Digital thermostats usually display temperature, time of day, programming and operating
status.
Select one:
True
False - ANSWERS✔-True
\Q\.With the fan switch in the on position, the indoor fan will,,,
Select one:
a. Run in cooling mode
b. run continuously
c. run only when the outdoor unit runs
,d. none of the above - ANSWERS✔-b. run continuously
\Q\.What is the most common type of T-sat in the HVAC industry?
Select one:
a. Line voltage
b. Remote bulb
c. Low voltage
d. None of the above - ANSWERS✔-c. Low voltage
\Q\.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 - ANSWERS✔-b. Fan Center
\Q\.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 - ANSWERS✔-b. OL
\Q\.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 - ANSWERS✔-b. Cooling Contactor
\Q\.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
d. run - ANSWERS✔-a. primary
\Q\.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 - ANSWERS✔-b. Overloading the control circuit
\Q\.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 - ANSWERS✔-c. Indoor fan Relay
, \Q\.Contactors are rated according to the maximum amperage through the;
Select one:
a. coil
b. contacts
c. thermostat
d. fuse - ANSWERS✔-b. contacts
\Q\.A cooling thermostat ___________________________.
Select one:
a. opens on temp. rise
b. closes on temp. rise - ANSWERS✔-b. closes on temp. rise
\Q\.When ohming out a load what reading should the technician get?
Select one:
a. 0
b. OL
c. Some Number
d. Source Voltage - ANSWERS✔-c. Some Number
\Q\.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
