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ESCO ELECTRICAL CERTIFICATION EXAM 2026 / STUDY GUIDE / ACTUAL EXAM QUESTIONS AND
ANSWERS GOOD GRADE IS WELL GUARANTEED GRADE A+
What is current flow? ✔️ D.The flow of electrons in a circuit
What is impedance? ✔️ A.Opposition to alternating current
Like charges will ✔️ B.Repel each other
Any material that will readily release electrons is called: ✔️ B.A conductor
The symbol for current is: ✔️ B. I
Electricity can produce: ✔️ D. All the above
light
heat
magnetism
The safety ground conductor is usually colored: ✔️ B.Green
An electron has: ✔️ B.A negative charge
Which of the following materials would be best suited for use as a semi-conductor? ✔️ D.Silicon
Which of the following meters must use internal power to check a load or circuit? ✔️ A.Ohmmeter
What would be the result if a 24 volt, 20 ohm contactor coil was wired in series with a 24 volt, 200 ohm control relay? ✔️ B.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 are consumed? ✔️ C. 2880
When testing a capacitor with an analog or digital ohmmeter, the meter should: ✔️ B.Measure low resistance then return to a high reading
How much resistance must be placed in a 120 volt circuit to limit the current to 2 amps? ✔️ A. 60 ohms
What is resistance? ✔️ A.Opposition to electron flow
In electrical wiring, a black colored wire indicates: ✔️ A. A hot conductor
How many watts are used by a heater operating on 460 volts and drawing 5 amps? ✔️ D. 2300
How are fuses sized? ✔️ D .Both A and B
What is generally considered the maximum allowable supply voltage variation ✔️ A.5%
Capacitors are rated in: ✔️ D .Both B and C
What is the term used to describe the output side of a transformer? ✔️ D .Secondary side
One horsepower is equal to ______ watts. ✔️ B. 746
A parallel circuit contains an 18 ohm and a 9 ohm resistor. What is the total resistance? ✔️ A. 6 ohms
In a series circuit, the voltage drop across each load will: ✔️ D .Add up to equal the source voltage
Which of the following is equal to 2.1kW? ✔️ c. 2100 watts
A capacitor analyzer is designed to check: ✔️ D .The capacitance of the a capacitor
On an electronic oil safety switch, what changes the pressure signal to an electrical signal? ✔️ A.Transducer
A three phase load requires a minimum of ✔️ A.Three supply lines
An electronically commutated motor (ECM) is designed to: ✔️ D .Provide proper airflow under various conditions
Resistance can be calculated by: ✔️ A.E divided by I
The total resistance in a parallel circuit will be: ✔️ D .Less than the smallest resistance
Which of the following statements about current is true? ✔️ B.Current flow will increase when voltage increases
When resistors are wired parallel: ✔️ B.The voltage drop across each resistor will be the same as the applied source voltage
Which of the following is equal to 100 milliamps? ✔️ C. 0.10 amps
The meter on a house measures the ____ passing through it. ✔️ C. Watts
What is the correct formula for determining wattage? ✔️ A.W = E x I
A parallel circuit consists of three resistors; R1 = 30 ohms, R2 = 15 ohms, R3 = 10 ohms. If the current through R2 = 4 amps, what is the source voltage? ✔️ B. 60 volts
Three 300 ohm resistors are wired parallel. What is the total resistance? ✔️ A. 100 ohms
Amps can be calculated by: ✔️ A. E/R
B.W/E
C.The square root of W/R
answer: D. all the above
Voltage can be calculated by: ✔️ C.IxR
Excessive current can be caused by: ✔️ D. Short circuit
A device with overload protection used to control a motor is a: ✔️ D. Line starter
What is the minimum number of wires required between two start/stop push button controls? ✔️ B. 1
If contacts become badly pitted, it is acceptable to: ✔️ B. Replace the contacts or control
The thermal overload contacts on a line starter are usually ___ reset. ✔️ A.Manual
Which of the following motors is most energy efficient? ✔️ B. ECM
Contactors are rated according to the maximum amperage through the: ✔️ B. Contacts
The ____ drawing illustrates where the components are located on the appliance. ✔️ A.Pictorial
On a good single phase compressor, which winding terminals have the highest resistance? ✔️ A.Run to start
When testing a motor with an ohmmeter, the following measurements are recorded; C to R = 4, C to S = 6.2, R to S = 10.2, R to ground = 20.4. This indicates: ✔️ B. A grounded condition
With a motor running at full load, voltmeter leads are placed on L1 and T1 with no measurable voltage detected. This indicates: ✔️ C. Good, clean contacts
When the temperature of a negative temperature coefficient (NTC) thermistor increases, its resistance: ✔️ B. Decreases
When the temperature of a positive temperature coefficient (PTC) thermistor increases, its resistance: ✔️ A.Increases
The most common type of transducer used with HVAC/R equipment creates a signal based on: ✔️ D. Pressure
A thermocouple can: ✔️ C. Generate a small DC current
To discharge a capacitor: ✔️ B. Use a 15,000 to 20,000 ohm, 2 to 5 watt resistor across the terminals
Which of the following is an acceptable temporary replacement capacitor for a 35MFD, 440VAC capacitor? ✔️ D. 37.5MFD, 440 VAC
When checking the windings on a three phase motor, the resistance readings should: ✔️ C. All read the same
Capacitors are always connected _____ with the start winding? ✔️ A. In series
The symbol for a heating thermostat is represented by: ✔️ C.
The symbol for a pressure switch that closes on a rise of pressure is represented by: ✔️ B.
The symbol for a pressure switch that opens on a rise in pressure is represented by: ✔️ D.
The synchronous speed of a four pole, 60 Hz single phase motor is: ✔️ D. 1800 RPM
The symbol for a transformer is: ✔️ C.
The symbol for a thermal overload is: ✔️ D.
The symbol for a pressure switch is ✔️ A.
The symbol for a thermostatic switch is: ✔️ B.
IN the schematic, what voltage would be found across l1 to l2? ✔️ A. 240 volts
IN the schematic,(during operation ) what voltage would be found across the condenser fan motor? ✔️ A
. 240 volts
IN the schematic,(during operation ) what voltage would be found across the transformer primary ✔️ B. 240 volts
In the schematic, what voltage would be found from termianl G to the load side of the transformer?
(Assume the thermostat is in the closed position and the fan is set to auto.) ✔️ B. 24 volts
In the schematic, what voltage would be found (during operation) acros the contacts when energized in line #8?
(Assume the thermostat is in the closed position and the fan is set to auto.) ✔️ B. 0 volts
Ine the schematic, what voltage would be be found from terminal Y to the input side of the coil on the line #11?
(Assume the thermostat is in the closed position and the fan is set to auto.) ✔️ A. 0 volts
When troubleshooting a A/C system in the schematic, the following conditions are found. The thermostat contacts are closed. The compressor and the condenser fan motor are short cycling. The blower motor is not running. This could be caused by? ✔️ C. Afaulty blower motor or blower relay
When troubleshooting a A/C system in the schematic, the following conditions are found. The thermostat contacts are closed. The compressor and the condenser fan motor are not running. The blower motor is running. This could be caused by? ✔️ C. the hp,lp,overloads, oil pressure switch are open
✔️ C. a faulty thermostat- auto / fan on switch
In the schematic, the crankcase heater will operate; ✔️ C. when the compressor is off
IN the schematic,, the coil on line # 11 does not control; ✔️ D. the blower motor
