Esco Electrical Test questions With
Complete Solutions
What is current flow? - ANSWERD.The flow of electrons in a circuit
What is impedance? - ANSWERA.Opposition to alternating current
Like charges will - ANSWERB.Repel each other
Any material that will readily release electrons is called: - ANSWERB.A conductor
The symbol for current is: - ANSWERB. I
Electricity can produce: - ANSWERD. All the above
light
heat
magnetism
The safety ground conductor is usually colored: - ANSWERB.Green
An electron has: - ANSWERB.A negative charge
Which of the following materials would be best suited for use as a semi-conductor? -
ANSWERD.Silicon
Which of the following meters must use internal power to check a load or circuit? -
ANSWERA.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? - ANSWERB.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? - ANSWERC. 2880
When testing a capacitor with an analog or digital ohmmeter, the meter should: -
ANSWERB.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? - ANSWERA.60 ohms
What is resistance? - ANSWERA.Opposition to electron flow
In electrical wiring, a black colored wire indicates: - ANSWERA. A hot conductor
How many watts are used by a heater operating on 460 volts and drawing 5 amps? -
ANSWERD .2300
, How are fuses sized? - ANSWERD .Both A and B
What is generally considered the maximum allowable supply voltage variation -
ANSWERA.5%
Capacitors are rated in: - ANSWERD .Both B and C
What is the term used to describe the output side of a transformer? -
ANSWERD .Secondary side
One horsepower is equal to ______ watts. - ANSWERB. 746
A parallel circuit contains an 18 ohm and a 9 ohm resistor. What is the total
resistance? - ANSWERA.6 ohms
In a series circuit, the voltage drop across each load will: - ANSWERD .Add up to
equal the source voltage
Which of the following is equal to 2.1kW? - ANSWERc .2100 watts
A capacitor analyzer is designed to check: - ANSWERD .The capacitance of the a
capacitor
On an electronic oil safety switch, what changes the pressure signal to an electrical
signal? - ANSWERA.Transducer
A three phase load requires a minimum of - ANSWERA.Three supply lines
An electronically commutated motor (ECM) is designed to: - ANSWERD .Provide
proper airflow under various conditions
Resistance can be calculated by: - ANSWERA.E divided by I
The total resistance in a parallel circuit will be: - ANSWERD .Less than the smallest
resistance
Which of the following statements about current is true? - ANSWERB.Current flow
will increase when voltage increases
When resistors are wired parallel: - ANSWERB.The voltage drop across each
resistor will be the same as the applied source voltage
Which of the following is equal to 100 milliamps? - ANSWERC. 0.10 amps
The meter on a house measures the ____ passing through it. - ANSWERC. Watts
What is the correct formula for determining wattage? - ANSWERA.W = E x I
Complete Solutions
What is current flow? - ANSWERD.The flow of electrons in a circuit
What is impedance? - ANSWERA.Opposition to alternating current
Like charges will - ANSWERB.Repel each other
Any material that will readily release electrons is called: - ANSWERB.A conductor
The symbol for current is: - ANSWERB. I
Electricity can produce: - ANSWERD. All the above
light
heat
magnetism
The safety ground conductor is usually colored: - ANSWERB.Green
An electron has: - ANSWERB.A negative charge
Which of the following materials would be best suited for use as a semi-conductor? -
ANSWERD.Silicon
Which of the following meters must use internal power to check a load or circuit? -
ANSWERA.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? - ANSWERB.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? - ANSWERC. 2880
When testing a capacitor with an analog or digital ohmmeter, the meter should: -
ANSWERB.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? - ANSWERA.60 ohms
What is resistance? - ANSWERA.Opposition to electron flow
In electrical wiring, a black colored wire indicates: - ANSWERA. A hot conductor
How many watts are used by a heater operating on 460 volts and drawing 5 amps? -
ANSWERD .2300
, How are fuses sized? - ANSWERD .Both A and B
What is generally considered the maximum allowable supply voltage variation -
ANSWERA.5%
Capacitors are rated in: - ANSWERD .Both B and C
What is the term used to describe the output side of a transformer? -
ANSWERD .Secondary side
One horsepower is equal to ______ watts. - ANSWERB. 746
A parallel circuit contains an 18 ohm and a 9 ohm resistor. What is the total
resistance? - ANSWERA.6 ohms
In a series circuit, the voltage drop across each load will: - ANSWERD .Add up to
equal the source voltage
Which of the following is equal to 2.1kW? - ANSWERc .2100 watts
A capacitor analyzer is designed to check: - ANSWERD .The capacitance of the a
capacitor
On an electronic oil safety switch, what changes the pressure signal to an electrical
signal? - ANSWERA.Transducer
A three phase load requires a minimum of - ANSWERA.Three supply lines
An electronically commutated motor (ECM) is designed to: - ANSWERD .Provide
proper airflow under various conditions
Resistance can be calculated by: - ANSWERA.E divided by I
The total resistance in a parallel circuit will be: - ANSWERD .Less than the smallest
resistance
Which of the following statements about current is true? - ANSWERB.Current flow
will increase when voltage increases
When resistors are wired parallel: - ANSWERB.The voltage drop across each
resistor will be the same as the applied source voltage
Which of the following is equal to 100 milliamps? - ANSWERC. 0.10 amps
The meter on a house measures the ____ passing through it. - ANSWERC. Watts
What is the correct formula for determining wattage? - ANSWERA.W = E x I
