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Comprehensive Electrical HVAC Questions And Answers With Verified Solutions Already Passed!!!
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Comprehensive Electrical HVAC Questions And Answers With Verified Solutions Already Passed!!
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Comprehensive Electrical HVACQuestions And Answers With Verified
Solutions Already Passed!!!
What is electricity?
ANSWER: Flow of electrons between atoms in common wire material or load
What is current flow?
ANSWER: Electrons flow
What creates a magnetic field in a conductor?
ANSWER: Current flow
What is voltage?
ANSWER: Electrical pressure that pushes current flow
What is the difference between a conductor and an insulator?
ANSWER: A conductor allows current flow.
What are the two common types of electricity?
ANSWER: Direct current and alternating current
What is control voltage?
ANSWER: The electrical section of the HVACR system that manages the on and
off cycles
,What is resistance?
ANSWER: Resistance is the force that slows down the flow of electrons in a
circuit.
What is a watt?
ANSWER: The rate of doing work or power
What is meant by a load?
ANSWER: Any component that has a resistance to electron or current flow
What is the Ohm's law formula?
ANSWER: E = I × R
What is Watt's formula?
ANSWER: W = I × E
What is the formula for finding resistance?
ANSWER: R = E / I
How many volts will be measured with an amp draw of 10A and a resistance
of 20 Ω?
ANSWER: 200 volts
How many amps will be measured in a circuit with 120V and a resistance of
20Ω?
ANSWER: 6A
How much resistance will be measured in a circuit with 240V and amp draw
of 10A?
ANSWER: 24Ω
,How many watts will be measured in a circuit with 240V and 10A? -
ANSWER✔✔ 2400 watts
How many watts will be measured in a circuit with 480V and 10A? -
ANSWER✔✔ 4.80 kW
Ohm's law is valid - ANSWER✔✔ with resistive loads only.
What is another term used for the watt? - ANSWER✔✔ Power
What is the total resistance of 3 resistors wired in series? Each has a resistance of
10Ω - ANSWER✔✔ 30Ω
What is the total resistance of 3 resistors wired in parallel? Each has a resistance of
10Ω - ANSWER✔✔ 3.3Ω
What is the total resistance of 4 resistors wired in parallel? There are two 20Ω
resistors and two 40Ω resistors. - ANSWER✔✔ 6.67Ω
What is the total resistance of a combination circuit that has a 10Ω resistor in series
with two parallel 10Ω resistors? - ANSWER✔✔ 15Ω
You measured the resistance of a 4,000-watt heat strip that has a resistance of 18
ohms. How many amps would you expect to measure when the heat strips are
energized? - ANSWER✔✔ 15 amps
, Regarding safety, what is the difference between high voltage and low voltage? -
ANSWER✔✔ High voltage can kill immediately. Low voltage (120V) can cause
bodily damage not realized until a day later.
What would you consider as PPE when working on energized equipment? -
ANSWER✔✔ Safety glasses
Insulated gloves
Protective clothing
all the above
What is the purpose of reading the DMM instructions? - ANSWER✔✔ To know
the limits of the instrument
Which of the following is good professional practice? - ANSWER✔✔ Carry spare
batteries for electrical instruments.
Have a spare DMM.
Carry an extra uniform
Which is not a common feature of a DMM? - ANSWER✔✔ Measures watts
What is the difference between a digital and an analog multimeter? -
ANSWER✔✔ A digital meter uses a display and an analog meter a needle
movement.
What does the term "accuracy"mean when referring to a DMM? - ANSWER✔✔ A
percentage of the actual value of the signal being measured
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