ELECTRICAL THEORY PRACTICE TEST EXAM QUESTIONS AND
ANSWERS WITH ACTUAL SOLUTIONS VERIFIED
Voltmeter
A high resistance is connected in series with the internal coil of a galvanometer to make?
If a transformer ratio is 20/1, what does it mean for the secondary?
The primary voltage is 20 times greater than that of the secondary.
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:
Ventilated
The output of a 3-phase transformer is measured in what units?
Amperes
In order to change the rotation of a DC series motor, what must be done?
F1 and F2 must be reversed.
What does Bonding do?
Controls the load on the system installation
A meter used to measure both AC and DC voltage and current is known as?
Multimeter
What material is used on conduits inside and outside of a box?
, Couplings
If a transformer has a voltage step-down from 117 volts to 6 volts then the ratio of the transformer is
equal to what?
1: 19, 5
If the power factor of a circuit is increased, then what occurs?
The reactive power is decreased
In a 3Ø circuit, how many electrical degrees separate each phase:
120
Ground fault protection for personnel on a 120 volt single-phase circuit is based on?
Unbalanced current between the grounded and ungrounded conductor.
Electrical appliances shall be installed in parallel in order to make the operation of each appliance in-
dependent of the others.
True
In order to calculate watt hours, which formulas must be used?
Amps/Volts (Amps Divided By Volts)
The peak value of AC voltage determines the breakdown voltage of insulation.
TRUE
The efficiency of electrical equipment is determined by what?
The motor speed divided by the input power
ANSWERS WITH ACTUAL SOLUTIONS VERIFIED
Voltmeter
A high resistance is connected in series with the internal coil of a galvanometer to make?
If a transformer ratio is 20/1, what does it mean for the secondary?
The primary voltage is 20 times greater than that of the secondary.
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:
Ventilated
The output of a 3-phase transformer is measured in what units?
Amperes
In order to change the rotation of a DC series motor, what must be done?
F1 and F2 must be reversed.
What does Bonding do?
Controls the load on the system installation
A meter used to measure both AC and DC voltage and current is known as?
Multimeter
What material is used on conduits inside and outside of a box?
, Couplings
If a transformer has a voltage step-down from 117 volts to 6 volts then the ratio of the transformer is
equal to what?
1: 19, 5
If the power factor of a circuit is increased, then what occurs?
The reactive power is decreased
In a 3Ø circuit, how many electrical degrees separate each phase:
120
Ground fault protection for personnel on a 120 volt single-phase circuit is based on?
Unbalanced current between the grounded and ungrounded conductor.
Electrical appliances shall be installed in parallel in order to make the operation of each appliance in-
dependent of the others.
True
In order to calculate watt hours, which formulas must be used?
Amps/Volts (Amps Divided By Volts)
The peak value of AC voltage determines the breakdown voltage of insulation.
TRUE
The efficiency of electrical equipment is determined by what?
The motor speed divided by the input power
