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Exam (elaborations)

HVAC Final Exam Electrical For Air Conditioning.

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  • HVAC
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  • HVAC

HVAC Final Exam Electrical For Air Conditioning.

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  • November 19, 2024
  • 40
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • HVAC
  • HVAC
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Boffin
HVAC



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 - ✔✔✔ - A) When Using a single transformer system



Digital thermostats usually display temperature, time of day, programming and operating status.

Select one:

True

False - ✔✔✔ - 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 - ✔✔✔ - b. run continuously



What is the most common type of T-sat in the HVAC industry?



HVAC Page 1

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Select one:

a. Line voltage

b. Remote bulb

c. Low voltage

d. None of the above - ✔✔✔ - 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 - ✔✔✔ - 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


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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

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



HVAC Page 3

, HVAC




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



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:



HVAC Page 4

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