HVAC ELECTRICAL TEST QUESTIONS AND ANSWERS
Current flow is - CORRECT ANSWER✅✅the flow of electrons in the circuit
impedance is - CORRECT ANSWER✅✅opposition to alternating current flow
like charges - CORRECT ANSWER✅✅repel each other
Any material that will readily release electrons is called - CORRECT ANSWER✅✅a conductor
the symbol for current is - CORRECT ANSWER✅✅I
Which of the following materials would best be suited for use as a semi-conductor - CORRECT
ANSWER✅✅silicone
the safety ground conductor is usually color coded - CORRECT ANSWER✅✅black (or bare or green &
yellow stripe)
An electron has - CORRECT ANSWER✅✅a negative charge
resistance is - CORRECT ANSWER✅✅opposition to current flow
How many watts of power are used by a heater operating at 460 volts and drawing 5 amps? - CORRECT
ANSWER✅✅2300 watts
What type of meter uses its own battery? - CORRECT ANSWER✅✅ohmmeter
in electrical wiring a black colored wire usually indicates - CORRECT ANSWER✅✅the hot conductor
Fuses are sized by - CORRECT ANSWER✅✅Volts & Amps
, 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; - CORRECT ANSWER✅✅Both bulbs light
Three defrost heaters; each 15 ohms are wired in parallel to a 120 volt power supply. How many watts
of power will be used? - CORRECT ANSWER✅✅2880 watts
What is generally considered to be the maximum allowable (plus or minus) supply voltage variation? -
CORRECT ANSWER✅✅5%
Capacitors are rated in: - CORRECT ANSWER✅✅Microfarads & Volts
When testing a capacitor with an analog ohmmeter, the needle on the meter should; - CORRECT
ANSWER✅✅deflect towards zero then return to infinite reading.
What is the term used to describe the output side of a transformer? - CORRECT ANSWER✅✅Secondary
side
One horsepower is equal to how many watts? - CORRECT ANSWER✅✅746 Watts
How much resistance must be placed in a 120 volt circuit in order to limit the current to 2 amps? -
CORRECT ANSWER✅✅60 ohms
A parallel circuit contains a 18 ohm and 9 ohm resistor. The total resistance equals; - CORRECT
ANSWER✅✅6 ohms
In a series circuit, the voltage drop across each resistance (load) will; - CORRECT ANSWER✅✅Add up to
equal the source voltage
The total resistance of a parallel circuit will be; - CORRECT ANSWER✅✅Less than the smallest
resistance
Current flow is - CORRECT ANSWER✅✅the flow of electrons in the circuit
impedance is - CORRECT ANSWER✅✅opposition to alternating current flow
like charges - CORRECT ANSWER✅✅repel each other
Any material that will readily release electrons is called - CORRECT ANSWER✅✅a conductor
the symbol for current is - CORRECT ANSWER✅✅I
Which of the following materials would best be suited for use as a semi-conductor - CORRECT
ANSWER✅✅silicone
the safety ground conductor is usually color coded - CORRECT ANSWER✅✅black (or bare or green &
yellow stripe)
An electron has - CORRECT ANSWER✅✅a negative charge
resistance is - CORRECT ANSWER✅✅opposition to current flow
How many watts of power are used by a heater operating at 460 volts and drawing 5 amps? - CORRECT
ANSWER✅✅2300 watts
What type of meter uses its own battery? - CORRECT ANSWER✅✅ohmmeter
in electrical wiring a black colored wire usually indicates - CORRECT ANSWER✅✅the hot conductor
Fuses are sized by - CORRECT ANSWER✅✅Volts & Amps
, 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; - CORRECT ANSWER✅✅Both bulbs light
Three defrost heaters; each 15 ohms are wired in parallel to a 120 volt power supply. How many watts
of power will be used? - CORRECT ANSWER✅✅2880 watts
What is generally considered to be the maximum allowable (plus or minus) supply voltage variation? -
CORRECT ANSWER✅✅5%
Capacitors are rated in: - CORRECT ANSWER✅✅Microfarads & Volts
When testing a capacitor with an analog ohmmeter, the needle on the meter should; - CORRECT
ANSWER✅✅deflect towards zero then return to infinite reading.
What is the term used to describe the output side of a transformer? - CORRECT ANSWER✅✅Secondary
side
One horsepower is equal to how many watts? - CORRECT ANSWER✅✅746 Watts
How much resistance must be placed in a 120 volt circuit in order to limit the current to 2 amps? -
CORRECT ANSWER✅✅60 ohms
A parallel circuit contains a 18 ohm and 9 ohm resistor. The total resistance equals; - CORRECT
ANSWER✅✅6 ohms
In a series circuit, the voltage drop across each resistance (load) will; - CORRECT ANSWER✅✅Add up to
equal the source voltage
The total resistance of a parallel circuit will be; - CORRECT ANSWER✅✅Less than the smallest
resistance
