Docsity
Log inSign up
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

HVAC Excellence - ELECTRICITY Exam 2026, Exams of Advanced Education

Chamberlain College of NursingAdvanced Education

HVAC Excellence - ELECTRICITY Exam 2026

Typology: Exams

2025/2026

Available from 03/07/2026

Ngugsben
Ngugsben 🇺🇸

5

(1)

7.5K documents

1 / 7

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
HVAC Excellence - ELECTRICITY
Exam
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 be best suited for use as a semi-conductor? -
CORRECT ANSWER silicon
The safety ground conductor is usually color coded; - CORRECT ANSWER green or
bare.
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 240 volts and drawing
5 amps? - CORRECT ANSWER 1200 watts
Which of the following meters must use its internal power to check a load or circuit?
- CORRECT ANSWER Ohmmeter
In electrical wiring, a black colored wire in an alternating current circuit usually
indicates; - CORRECT ANSWER the hot conductor.
Fuses are sized by: - CORRECT ANSWER Volts & Amps
What would be the result, if a 24 volt, 20-ohm low voltage conta ctor coil were wired
in series with a 24 volt, 200-ohm control relay coil? - CORRECT ANSWER Only the
control relay would operate.
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
Which of the following is generally considered to be within 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 or digital ohmmeter, the meter should; -
CORRECT ANSWER measure low resistance then return to high reading.
What is the term used to describe the output side of a transformer? - CORRECT
ANSWER Secondary side.
pf3
pf4
pf5

Partial preview of the text

Download HVAC Excellence - ELECTRICITY Exam 2026 and more Exams Advanced Education in PDF only on Docsity!

HVAC Excellence - ELECTRICITY

Exam

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 be best suited for use as a semi-conductor? - CORRECT ANSWER silicon The safety ground conductor is usually color coded; - CORRECT ANSWER green or bare. 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 240 volts and drawing 5 amps? - CORRECT ANSWER 1200 watts Which of the following meters must use its internal power to check a load or circuit?

  • CORRECT ANSWER Ohmmeter In electrical wiring, a black colored wire in an alternating current circuit usually indicates; - CORRECT ANSWER the hot conductor. Fuses are sized by: - CORRECT ANSWER Volts & Amps What would be the result, if a 24 volt, 20-ohm low voltage conta ctor coil were wired in series with a 24 volt, 200-ohm control relay coil? - CORRECT ANSWER Only the control relay would operate. 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 Which of the following is generally considered to be within 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 or digital ohmmeter, the meter should; - CORRECT ANSWER measure low resistance then return to high reading. What is the term used to describe the output side of a transformer? - CORRECT ANSWER Secondary side.

One horsepower is equal to __________ watts. - CORRECT ANSWER 746 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 a 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. Which of the following statements about current is true? - CORRECT ANSWER Current flow will increase when voltage increases. When resistors are wired in parallel; - CORRECT ANSWER the voltage drop across each resistor will be the same as the applied source Which of the following is equal to 2.1KW? - CORRECT ANSWER 2,100 Watts Which of the following is equal to 100 milliamps? - CORRECT ANSWER 0. amperes A capacitor analyzer is designed to read; - CORRECT ANSWER the capacitive resistance of a capacitor. On an electronic oil safety switch what changes the pressure singal to electrical signal? - CORRECT ANSWER Transducer. The electric meter on a house measures the ______________ passing th rough it. - CORRECT ANSWER wattage A three phase load requires a minimum of; - CORRECT ANSWER three supply lines. Which of the following is the correct formula for determining wattage in an electrical circuit? - CORRECT ANSWER W = E times I A parallel circuit consists of three resistors.R1 = 30 Ohms, R2 = 15 Ohms, R3 = 10 Ohms. If the current through R2 is 4 Amps (I = 4 Amps), what is the source Voltage?

  • CORRECT ANSWER 60 volts Three 300 ohm resistors are wired in parallel. The total resistance equals; - CORRECT ANSWER 100 ohms An electronically commutated motor (ECM) is designed to; - CORRECT ANSWER provide proper air flow under various conditions. Resistance can be calculated by: - CORRECT ANSWER E divided by I. Divided Voltage can be calculated by; - CORRECT ANSWER I times R An ohmmeter should never be connected to; - CORRECT ANSWER a live circuit or a charged capacitor until it has been discharged

When testing the windings of a single phase motor, - CORRECT ANSWER the common to run terminals show the lowest resistance. Direct Digital Control (DDC) is - CORRECT ANSWER electronic controls use for equipment operation and monitoring A step up transformer increases; - CORRECT ANSWER voltage. Transformers are rated according to; - CORRECT ANSWER VA at the secondary. Utility companies usually supply residential homes with ______________ service. - CORRECT ANSWER 240V, single phase, three wire What connects to the terminals T1, T2, & T3 on a contactor or motor starter? - CORRECT ANSWER Load connections Circuit breakers & fuses are primarily used to provide; - CORRECT ANSWER protection from an overload of current. Excessive current can be caused by; - CORRECT ANSWER short circuit. A device with overload protection used to control a motor is a; - CORRECT ANSWER line starter. Relays are generally used to control inductive loads up to __________ amps. - CORRECT ANSWER 10 Contactors are rated according to the maximum amperage through the; - CORRECT ANSWER contacts. What is the minimum number of wires required between two Start/Stop push button controls? - CORRECT ANSWER 3 If contacts become badly pitted, it is acceptable to. - CORRECT ANSWER replace the contacts or control The thermal overload contacts on a line starter are usually_______________ reset. - CORRECT ANSWER manual The ______________ drawing illustrates where the components are located in small appliances. - CORRECT ANSWER pictorial Which of the following motors is most energy efficient. - CORRECT ANSWER ЕСM On a good single-phase compressor motor, which winding terminals have the highest resistance? - CORRECT ANSWER run to start. When testing a motor with an ohmmeter, the following measurements are recorded, Common to run 4 ohms, Common to start 6.2 ohms, Run to start 10.2 ohms, and Common to ground 20.4; This indicates a/an; - CORRECT ANSWER grounded condition.

With a motor running at full load, voltmeter leads are placed on L1 and T1 terminals of the contactor. The voltmeter indicates no measurable voltage. This is an indication of. - CORRECT ANSWER good clean contacts. When the temperature of a negative temperature coefficient (NTC) thermistor increases, its resistance will. - CORRECT ANSWER decrease. When the temperature of a positive temperature coefficient (PTC) thermistor increases, its resistance wilI; - CORRECT ANSWER increase. A transducer can create a signal based on. - CORRECT ANSWER pressure. A typical thermocouple used on a gas furnace can. - CORRECT ANSWER generate a small DC electrical current. To discharge a capacitor prior to ohmmeter testing. - CORRECT ANSWER use a 20,000 ohm, 2 to 5 watt resistor across the terminals. Which of the following is an acceptable temporary replacement for a run capacitor rated at 35MFD @ 440VAC - CORRECT ANSWER 37.5MFD @ 440VAC. The synchronous speed of a four pole, 60 Hz single phase motor is; - CORRECT ANSWER 1800 rpm. The symbol for a heating thermostat is represented by diagram. - CORRECT ANSWER B The symbol for a pressure switch that closes on pressure rise represented by diagram - CORRECT ANSWER A The symbol for a pressure switch that opens on pressure rise is represented by diagram. - CORRECT ANSWER C In the schematic, what voltage would be found across L1 to L2? - CORRECT ANSWER 240 volts. In the schematic, what voltage would be found across the condenser fan motor? - CORRECT ANSWER O volts, In the schematic, what voltage would be found across the transformer primary? - CORRECT ANSWER 240 volts. In the schematic, what voltage would be found across the fuse in line #10 with the thermostat closed? - CORRECT ANSWER 0 volts. In the schematic, what voltage would be found from terminal G to the load side of the transformer? - CORRECT ANSWER 0 volts In the schematic, what voltage would be found across the contacts when energized in line #8 - CORRECT ANSWER 0 volts. In the schematic, what voltage would be found from terminal Y to the input side of the coil on line #11? - CORRECT ANSWER 0 volts.

When current flows, a _______________ is produced around the conductor. - CORRECT ANSWER magnetic field Technician #1 says that an open transformer coil is indicated by a reading of infinity on an analog ohmmeter. Technician #2 says that a shorted transformer coil is indicated by a reading of infinity on an analog ohmmeter. Which technician is correct, or are both technicians correct? - CORRECT ANSWER Technician #2 only The terminals T1, T2, & T3 are located at the _______ of a contactor. - CORRECT ANSWER top Circuit fuses and breakers are primarily used to protect - CORRECT ANSWER loads