HVAC Electrical Test
✅✅-the flow of electrons in the circuit
Current flow is -
impedance is - ✅✅-opposition to alternating current flow
like charges - ✅✅-repel each other
Any material that will readily release electrons is called - ✅✅-a conductor
the symbol for current is - ✅✅-I
✅✅
Which of the following materials would best be suited for use as a semi-conductor -
-silicone
the safety ground conductor is usually color coded - ✅✅-black (or bare or green &
yellow stripe)
An electron has -✅✅-a negative charge
resistance is - ✅✅-opposition to current flow
✅✅
How many watts of power are used by a heater operating at 460 volts and drawing 5
amps? - -2300 watts
What type of meter uses its own battery? - ✅✅-ohmmeter
in electrical wiring a black colored wire usually indicates - ✅✅-the hot conductor
Fuses are sized by - ✅✅-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; - -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? - -2880 watts
✅✅
What is generally considered to be the maximum allowable (plus or minus) supply
voltage variation? - -5%
Capacitors are rated in: - ✅✅-Microfarads & Volts
, ✅✅
When testing a capacitor with an analog ohmmeter, the needle on the meter should;
- -deflect towards zero then return to infinite reading.
✅✅
What is the term used to describe the output side of a transformer? -
-Secondary side
One horsepower is equal to how many watts? - ✅✅-746 Watts
✅✅
How much resistance must be placed in a 120 volt circuit in order to limit the current
to 2 amps? - -60 ohms
✅✅
A parallel circuit contains a 18 ohm and 9 ohm resistor. The total resistance equals; -
-6 ohms
In a series circuit, the voltage drop across each resistance (load) will; - ✅✅-Add up
to equal the source voltage
The total resistance of a parallel circuit will be; - ✅✅-Less than the smallest
resistance
Which of the following statements about current is true? - ✅✅-Current flow will
increase when voltage increases.
When resistors are wired in parallel; - ✅✅-The voltage drop across each resistor
will be the same as the applied source voltage.
Which of the following is equal to 2.1KW? - ✅✅-2,100 Watts
Which of the following is equal to 100 milliamps? - ✅✅-0.10 amperes
A capacitor analyzer is designed to read; - ✅✅-the capacitance of a capacitor
A 240 volt, 3 wire circuit can be split into two 120 volt circuits. - ✅✅-TRUE
✅✅
The electric meter on a house measures the _______ passing through it. -
-wattage
A three phase load requires a minimum of; - ✅✅-three supply lines
✅✅
Which of the following is the correct formula for determining wattage in an electrical
circuit? - -W = E times I (or V x I)
A parallel circuit consists of three resistors
R1=30 ohms R2=15 ohms R3=10ohms
✅✅-the flow of electrons in the circuit
Current flow is -
impedance is - ✅✅-opposition to alternating current flow
like charges - ✅✅-repel each other
Any material that will readily release electrons is called - ✅✅-a conductor
the symbol for current is - ✅✅-I
✅✅
Which of the following materials would best be suited for use as a semi-conductor -
-silicone
the safety ground conductor is usually color coded - ✅✅-black (or bare or green &
yellow stripe)
An electron has -✅✅-a negative charge
resistance is - ✅✅-opposition to current flow
✅✅
How many watts of power are used by a heater operating at 460 volts and drawing 5
amps? - -2300 watts
What type of meter uses its own battery? - ✅✅-ohmmeter
in electrical wiring a black colored wire usually indicates - ✅✅-the hot conductor
Fuses are sized by - ✅✅-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; - -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? - -2880 watts
✅✅
What is generally considered to be the maximum allowable (plus or minus) supply
voltage variation? - -5%
Capacitors are rated in: - ✅✅-Microfarads & Volts
, ✅✅
When testing a capacitor with an analog ohmmeter, the needle on the meter should;
- -deflect towards zero then return to infinite reading.
✅✅
What is the term used to describe the output side of a transformer? -
-Secondary side
One horsepower is equal to how many watts? - ✅✅-746 Watts
✅✅
How much resistance must be placed in a 120 volt circuit in order to limit the current
to 2 amps? - -60 ohms
✅✅
A parallel circuit contains a 18 ohm and 9 ohm resistor. The total resistance equals; -
-6 ohms
In a series circuit, the voltage drop across each resistance (load) will; - ✅✅-Add up
to equal the source voltage
The total resistance of a parallel circuit will be; - ✅✅-Less than the smallest
resistance
Which of the following statements about current is true? - ✅✅-Current flow will
increase when voltage increases.
When resistors are wired in parallel; - ✅✅-The voltage drop across each resistor
will be the same as the applied source voltage.
Which of the following is equal to 2.1KW? - ✅✅-2,100 Watts
Which of the following is equal to 100 milliamps? - ✅✅-0.10 amperes
A capacitor analyzer is designed to read; - ✅✅-the capacitance of a capacitor
A 240 volt, 3 wire circuit can be split into two 120 volt circuits. - ✅✅-TRUE
✅✅
The electric meter on a house measures the _______ passing through it. -
-wattage
A three phase load requires a minimum of; - ✅✅-three supply lines
✅✅
Which of the following is the correct formula for determining wattage in an electrical
circuit? - -W = E times I (or V x I)
A parallel circuit consists of three resistors
R1=30 ohms R2=15 ohms R3=10ohms
