Esco Electrical Certification Exam 2023 Questions and
Answers
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:
Answers
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:
