HVAC FINAL EXAM ELECTRICAL FOR AIR
CONDITIONING
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 - ANSWER -A)
When Using a single transformer system
Digital thermostats usually display temperature, time of
day, programming and operating status.
Select one:
True
,False - ANSWER -True
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 - ANSWER -b. run continuously
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 - ANSWER -c. Low voltage
,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 - ANSWER -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 - ANSWER -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 - ANSWER -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
d. run - ANSWER -a. primary
What would be the cause of a transformer failure?
Select one:
a. Compressor amps too high for circuit
CONDITIONING
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 - ANSWER -A)
When Using a single transformer system
Digital thermostats usually display temperature, time of
day, programming and operating status.
Select one:
True
,False - ANSWER -True
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 - ANSWER -b. run continuously
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 - ANSWER -c. Low voltage
,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 - ANSWER -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 - ANSWER -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 - ANSWER -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
d. run - ANSWER -a. primary
What would be the cause of a transformer failure?
Select one:
a. Compressor amps too high for circuit
