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Electrical Theory Practice Test Questions with Verified Answers
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
Inductance and capacitance are not considerations in a
DC current because? - -DC supply carries power
equally
Two transmission wires create a corona when...? - -
The wires are installed overlapping or too close together
Rearranging the control components in an electrical
diagram in order to simplify tracing of a circuit is an
example of a schematic diagram. - -TRUE
In a coil, the higher the level of self-inductance: - -
The longer the delay will be in establishing current through
it
A negative charge will do which of the following: 1. I.
Interact with negative charges 2. II. Interact with positive
charges 3. III. Cause a short in a positive system - -I
& II
If a circuit breaker is installed vertically and the handle is
flipped up, then the circuit breaker will be what? - -
Locked in place
The electrical property of conductors that allows them to
oppose the free flow of current traveling over them is
measured in what? - -Volts
