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HVAC Electrical Test Questions and
Answers
Q: Current flow is
ANS: the flow of electrons in the circuit
Q:
impedance is
ANS: opposition to alternating current flow
Q:
like charges
ANS: repel each other
Q:
Any material that will readily release electrons is called
ANS: a conductor
Q:
the symbol for current is
ANS: I
Q:
Which of the following materials would best be suited for use as a semi-conductor
ANS: silicone
Q:
the safety ground conductor is usually color coded
ANS: black (or bare or green & yellow stripe)
Q:
An electron has
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ANS: a negative charge
Q:
resistance is
ANS: opposition to current flow
Q:
How many watts of power are used by a heater operating at 460 volts and drawing 5
amps?
ANS: 2300 watts
Q:
What type of meter uses its own battery?
ANS: ohmmeter
Q:
in electrical wiring a black colored wire usually indicates
ANS: the hot conductor
Q:
Fuses are sized by
ANS: Volts & Amps
Q:
Two 120 volt incandescent light bulbs are wired in series, one is a 60 watt bulb, the other
is a 4 watt bulb. The result would be;
ANS: Both bulbs light
Q:
Three defrost heaters; each 15 ohms are wired in parallel to a 120 volt power supply. How
many watts of power will be used?
ANS: 2880 watts
Q:
What is generally considered to be the maximum allowable (plus or minus) supply
voltage variation?
HVAC Electrical Test Questions and
Answers
Q: Current flow is
ANS: the flow of electrons in the circuit
Q:
impedance is
ANS: opposition to alternating current flow
Q:
like charges
ANS: repel each other
Q:
Any material that will readily release electrons is called
ANS: a conductor
Q:
the symbol for current is
ANS: I
Q:
Which of the following materials would best be suited for use as a semi-conductor
ANS: silicone
Q:
the safety ground conductor is usually color coded
ANS: black (or bare or green & yellow stripe)
Q:
An electron has
, Page | 2
ANS: a negative charge
Q:
resistance is
ANS: opposition to current flow
Q:
How many watts of power are used by a heater operating at 460 volts and drawing 5
amps?
ANS: 2300 watts
Q:
What type of meter uses its own battery?
ANS: ohmmeter
Q:
in electrical wiring a black colored wire usually indicates
ANS: the hot conductor
Q:
Fuses are sized by
ANS: Volts & Amps
Q:
Two 120 volt incandescent light bulbs are wired in series, one is a 60 watt bulb, the other
is a 4 watt bulb. The result would be;
ANS: Both bulbs light
Q:
Three defrost heaters; each 15 ohms are wired in parallel to a 120 volt power supply. How
many watts of power will be used?
ANS: 2880 watts
Q:
What is generally considered to be the maximum allowable (plus or minus) supply
voltage variation?
