# Basic Electrical Theory Assessment Test

100 Questions | Attempts: 14132  Settings  Do you want to brush up on your basic electrical concept? Are you looking for a practice test to check yourself? Check out this basic electrical theory assessment test and see how prepared you are for the exams. An electrical theory is a basic building block that every electrician knows. The quiz contains questions related to The Fundamental Laws of Electricity, Ohm's law, etc. Do you think you can secure good marks here? Give this quiz a try and see the result. Best of luck, dear!

• 1.
For electroplating power, which of the following generators should be used?
• A.

Separately excited

• B.

Delta system

• C.

Split phase

• D.

None of the above

• 2.
Power factor is equal to which of the following:
• A.

Apparent power multiplied by true power

• B.

True power divided by apparent power

• C.

Watts multiplied by amps

• D.

None of the above

• 3.
The combined opposition to current by resistance and reactance is which of the following:
• A.

“Z”

• B.

Impedance

• C.

Both of the above

• D.

None of the above

• 4.
In a generator, voltage is produced by which of the following conditions:
• A.

Electrical pressure

• B.

Vibration

• C.

Magnetism

• D.

Cutting lines of force

• 5.
A capacitor performs which of the following functions:
• A.

It opposes changes in voltage

• B.

It generators voltage

• C.

It creates changes in amperage

• D.

None of the above

• 6.
Where the current flow through a conductor is greatest will be the point where the voltage drop is the lowest.
• A.

True

• B.

False

• 7.
Of all of the materials used for insulation, which of the following has the highest electrical breakdown strength and the longest life:
• A.

Rubber

• B.

Cloth

• C.

Impregnated paper

• D.

Colored vinyl

• 8.
What does it cost per year (at 8 cents per kWh) for the power loss of a 12 AWG circuit conductor (100ft long) that has a total resistance of 0.40 ohms and current flow of 16A?
• A.

\$30

• B.

\$50

• C.

\$70

• D.

\$90

• 9.
A three horsepower motor is equivalent to which of the following in watts:
• A.

746 watts

• B.

2238 watts

• C.

3000 watts

• D.

None of the above

• 10.
Illumination is measured in which of the following units:
• A.

Lumens

• B.

Foot candles

• C.

Light per square inch

• D.

None of the above

• 11.
During one complete rotation of 360 degrees, a three-phase 6-pole AC 34 kVA alternator on a Y- connected system will have how many cycles:
• A.

4

• B.

3

• C.

18

• D.

12

• 12.
Which of the following terms is used to describe the inductive action, which causes current to flow on the outer surface of a conductor:
• A.

Halo Effect

• B.

Inductance

• C.

Skin effect

• D.

Insulated par value

• 13.
The wattage  rating of a resistor determines its ability to absorb heat.
• A.

True

• B.

False

• 14.
A wiring system has two lengths of wires, where wire A has a resistance of 10 ohms and wire B is three times the length of wire A with two times the cross-sectional area, which means that resistance of wire B is equal to which of the following:
• A.

30 ohms

• B.

20 ohms

• C.

15 ohms

• D.

10 ohms

• 15.
The circuit conductors between service equipment and the final branch circuit overcurrent device are considered to be which of the following:
• A.

Service laterals

• B.

Feeder conductors

• C.

Grounded conductors

• D.

A wire assembly

• 16.
The sum of series voltage drops equals the applied voltage.
• A.

True

• B.

False

• 17.
If a transformer ratio is 20/1,  then which of the following is true:
• A.

For every 20 turns in the primary, there is one turn in the secondary.

• B.

The primary voltage is 20 times greater than that of the secondary.

• C.

For every 20 rotations in the secondary, there is one rotation in the primary.

• D.

None of the above

• 18.
If a series circuit has unequal resistances throughout the circuit, then which of the following is true:
• A.

The lowest resistance has the highest current.

• B.

The lowest resistance has the highest voltage.

• C.

The highest resistance has the highest voltage.

• D.

The highest resistance has the highest current.

• 19.
When reduced to the most nominal component, the smallest element of matter is which of the following:
• A.

One ohm of electrical current

• B.

An atom

• C.

Electrons

• D.

None of the above

• 20.
The armature reaction in an alternator is magnetizing at lagging loads.
• A.

True

• B.

False

• 21.
A wire secured at one end with the other end fastened to a pole under tension is known as which of the following:
• A.

Messenger wire

• B.

A service drop

• C.

A guy wire

• D.

None of the above

• 22.
Which of the following is characteristic of inductance?
• A.

It creates opposition to voltage.

• B.

It opposes changes in current.

• C.

It creates changes in current.

• D.

None of the above

• 23.
If a motor enclosure is designed to contain sparks or flashes that could ignite surrounding vapors or gases, then the enclosure is considered to be which of the following:
• A.

Ventilated

• B.

Explosion proof

• C.

Explosion resistant

• D.

Fire proof

• 24.
The output of a 3-phase transformer is measured in which of the following units:
• A.

Volts

• B.

Amperes

• C.

Volt-amps

• D.

Watts

• 25.
In order to change the rotation of a DC series motor, which of the following must be done:
• A.

The motor must be converted to AC.

• B.

F1 and F2 must be reversed.

• C.

The capacitor leads must be reversed.

• D.

The frequency must be altered.

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