HVAC Electrical Test Questions Answered Correctly Latest Update 2025
Current flow is - Answers the flow of electrons in the circuit
impedance is - Answers opposition to alternating current flow
like charges - Answers repel each other
Any material that will readily release electrons is called - Answers a conductor
the symbol for current is - Answers I
Which of the following materials would best be suited for use as a semi-conductor - Answers silicone
the safety ground conductor is usually color coded - Answers black (or bare or green & yellow stripe)
An electron has - Answers a negative charge
resistance is - Answers opposition to current flow
How many watts of power are used by a heater operating at 460 volts and drawing 5 amps? - Answers
2300 watts
What type of meter uses its own battery? - Answers ohmmeter
in electrical wiring a black colored wire usually indicates - Answers the hot conductor
Fuses are sized by - Answers 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; - Answers 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? - Answers 2880 watts
What is generally considered to be the maximum allowable (plus or minus) supply voltage variation? -
Answers 5%
Capacitors are rated in: - Answers Microfarads & Volts
When testing a capacitor with an analog ohmmeter, the needle on the meter should; - Answers deflect
towards zero then return to infinite reading.
What is the term used to describe the output side of a transformer? - Answers Secondary side
One horsepower is equal to how many watts? - Answers 746 Watts
How much resistance must be placed in a 120 volt circuit in order to limit the current to 2 amps? -
Answers 60 ohms
, A parallel circuit contains a 18 ohm and 9 ohm resistor. The total resistance equals; - Answers 6 ohms
In a series circuit, the voltage drop across each resistance (load) will; - Answers Add up to equal the
source voltage
The total resistance of a parallel circuit will be; - Answers Less than the smallest resistance
Which of the following statements about current is true? - Answers Current flow will increase when
voltage increases.
When resistors are wired in parallel; - Answers The voltage drop across each resistor will be the same as
the applied source voltage.
Which of the following is equal to 2.1KW? - Answers 2,100 Watts
Which of the following is equal to 100 milliamps? - Answers 0.10 amperes
A capacitor analyzer is designed to read; - Answers the capacitance of a capacitor
A 240 volt, 3 wire circuit can be split into two 120 volt circuits. - Answers TRUE
The electric meter on a house measures the _______ passing through it. - Answers wattage
A three phase load requires a minimum of; - Answers three supply lines
Which of the following is the correct formula for determining wattage in an electrical circuit? - Answers
W = E times I (or V x I)
A parallel circuit consists of three resistors
R1=30 ohms R2=15 ohms R3=10ohms
if the current through R2=4 amperes, what is the source voltage? - Answers 60 volts
The 300 ohm resistors are wired in parallel. The total resistance equals; - Answers 100 ohms
An electronically commutated motor (ECM) is Designed to - Answers provide proper air flow under
various conditions.
Resistance can be calculated by - Answers E divided by I (R = E/I)
Voltage can be calculated by - Answers I times R
An ohmmeter should never be connected to - Answers a live circuit
Which of the following would be considered an inductive load? - Answers electric motor
The voltage to ground of a "high leg" on a three phase open Delta system will be approximately; -
Answers 208
Current flow is - Answers the flow of electrons in the circuit
impedance is - Answers opposition to alternating current flow
like charges - Answers repel each other
Any material that will readily release electrons is called - Answers a conductor
the symbol for current is - Answers I
Which of the following materials would best be suited for use as a semi-conductor - Answers silicone
the safety ground conductor is usually color coded - Answers black (or bare or green & yellow stripe)
An electron has - Answers a negative charge
resistance is - Answers opposition to current flow
How many watts of power are used by a heater operating at 460 volts and drawing 5 amps? - Answers
2300 watts
What type of meter uses its own battery? - Answers ohmmeter
in electrical wiring a black colored wire usually indicates - Answers the hot conductor
Fuses are sized by - Answers 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; - Answers 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? - Answers 2880 watts
What is generally considered to be the maximum allowable (plus or minus) supply voltage variation? -
Answers 5%
Capacitors are rated in: - Answers Microfarads & Volts
When testing a capacitor with an analog ohmmeter, the needle on the meter should; - Answers deflect
towards zero then return to infinite reading.
What is the term used to describe the output side of a transformer? - Answers Secondary side
One horsepower is equal to how many watts? - Answers 746 Watts
How much resistance must be placed in a 120 volt circuit in order to limit the current to 2 amps? -
Answers 60 ohms
, A parallel circuit contains a 18 ohm and 9 ohm resistor. The total resistance equals; - Answers 6 ohms
In a series circuit, the voltage drop across each resistance (load) will; - Answers Add up to equal the
source voltage
The total resistance of a parallel circuit will be; - Answers Less than the smallest resistance
Which of the following statements about current is true? - Answers Current flow will increase when
voltage increases.
When resistors are wired in parallel; - Answers The voltage drop across each resistor will be the same as
the applied source voltage.
Which of the following is equal to 2.1KW? - Answers 2,100 Watts
Which of the following is equal to 100 milliamps? - Answers 0.10 amperes
A capacitor analyzer is designed to read; - Answers the capacitance of a capacitor
A 240 volt, 3 wire circuit can be split into two 120 volt circuits. - Answers TRUE
The electric meter on a house measures the _______ passing through it. - Answers wattage
A three phase load requires a minimum of; - Answers three supply lines
Which of the following is the correct formula for determining wattage in an electrical circuit? - Answers
W = E times I (or V x I)
A parallel circuit consists of three resistors
R1=30 ohms R2=15 ohms R3=10ohms
if the current through R2=4 amperes, what is the source voltage? - Answers 60 volts
The 300 ohm resistors are wired in parallel. The total resistance equals; - Answers 100 ohms
An electronically commutated motor (ECM) is Designed to - Answers provide proper air flow under
various conditions.
Resistance can be calculated by - Answers E divided by I (R = E/I)
Voltage can be calculated by - Answers I times R
An ohmmeter should never be connected to - Answers a live circuit
Which of the following would be considered an inductive load? - Answers electric motor
The voltage to ground of a "high leg" on a three phase open Delta system will be approximately; -
Answers 208
