Power Engineering - 4th and 3rd Class Electricity Practice
Questions 2 With Complete Solutions
( 4-080-2.2) When reading the dials of a kilowatt hour meter,
read:
a. Them in the sequence shown by the letters under each
b. Them from left to right
c. The ones that rotate clockwise first
d. Them from right to left Correct Answers d. Them from right
to left
( 4-081-1.13) The strength of the magnetic field produced in a
shunt wound generator:
a. Is weak
b. Is fairly constant
c. Is regulated by an external AC supply
d. Increases with generator load Correct Answers b. Is fairly
constant
( 4-081-1.8) ___________ are used on motors and generators to
produce the strong magnetic field required by these machines.
a. Insulated wires
b. Transformers
c. Rheostats
d. Pole pieces Correct Answers d. Pole pieces
( 4-081-2.14) Synchronous motors are desirable because they
can
,a. Start alternators
b. Lower the power factor of a system
c. Replace variable-speed DC motors
d. Improve the power factor of a system Correct Answers d.
Improve the power factor of a system
(4-078-1.1) In an atom the electrons:
a. Orbit around each other
b. Are repelled by the neutrons
c. Are attracted to the protons
d. Are large in size when compared to the protons Correct
Answers c. Are attracted to the protons
(4-078-1.11) Atoms that have greater than 3 electrons in the
outer shell are:
a. Positively charged
b. Good conductors
c. Neutrally charged
d. Poor conductors Correct Answers d. Poor conductors
(4-078-1.3) Since the discovery of electrons, it has been
determined that electrons have a negative charge, and flow from:
a. Positive to negative
b. Negative to positive
c. A lower potential to a higher potential
d. High amperage to low amperage Correct Answers b.
Negative to positive
,(4-078-1.5) The flow of electrons in a uniform direction is
called:
a. Voltage drop
b. Electric current flow
c. Potential difference
d. Electromotive flow Correct Answers b. Electric current flow
(4-078-1.8) A material that transfers electric charge is called:
a. An insulator
b. A conductor
c. A circuit
d. A wire Correct Answers b. A conductor
(4-078-1.9) If an electrical _____ is placed across a conductor,
the electrons will drift from the negative end towards the
positive end of the conductor.
a. Potential
b. Current
c. Resistance
d. Wire Correct Answers a. Potential
(4-078-2.1) A closed electrical circuit will:
a. Close-off the flow of current
b. Be series only
c. Be parallel only
, d. Allow current to flow Correct Answers d. Allow current to
flow
(4-078-2.2) The purpose of having an upward movement of a
switch handle to close the switch is:
a. To have the handle out of the way
b. To meet the requirements of the electrical codes
c. It indicates the condition of the circuit
d. To prevent the switch from closing due to gravity Correct
Answers d. To prevent the switch from closing due to gravity
(4-078-2.3) An open circuit is one in which:
a. A switch is closed
b. The wires are bare
c. A switch is open
d. Voltage may exit Correct Answers c. A switch is open
(4-078-2.4) An electrical device that is designed to start and stop
current flow is the:
a. Power supply
b. Fuse
c. Circuit breaker
d. Switch Correct Answers d. Switch
(4-078-2.5) A triple pole single throw switch is one that:
a. Opens and closes three wires of an electrical circuit
b. Has three magnetic poles
Questions 2 With Complete Solutions
( 4-080-2.2) When reading the dials of a kilowatt hour meter,
read:
a. Them in the sequence shown by the letters under each
b. Them from left to right
c. The ones that rotate clockwise first
d. Them from right to left Correct Answers d. Them from right
to left
( 4-081-1.13) The strength of the magnetic field produced in a
shunt wound generator:
a. Is weak
b. Is fairly constant
c. Is regulated by an external AC supply
d. Increases with generator load Correct Answers b. Is fairly
constant
( 4-081-1.8) ___________ are used on motors and generators to
produce the strong magnetic field required by these machines.
a. Insulated wires
b. Transformers
c. Rheostats
d. Pole pieces Correct Answers d. Pole pieces
( 4-081-2.14) Synchronous motors are desirable because they
can
,a. Start alternators
b. Lower the power factor of a system
c. Replace variable-speed DC motors
d. Improve the power factor of a system Correct Answers d.
Improve the power factor of a system
(4-078-1.1) In an atom the electrons:
a. Orbit around each other
b. Are repelled by the neutrons
c. Are attracted to the protons
d. Are large in size when compared to the protons Correct
Answers c. Are attracted to the protons
(4-078-1.11) Atoms that have greater than 3 electrons in the
outer shell are:
a. Positively charged
b. Good conductors
c. Neutrally charged
d. Poor conductors Correct Answers d. Poor conductors
(4-078-1.3) Since the discovery of electrons, it has been
determined that electrons have a negative charge, and flow from:
a. Positive to negative
b. Negative to positive
c. A lower potential to a higher potential
d. High amperage to low amperage Correct Answers b.
Negative to positive
,(4-078-1.5) The flow of electrons in a uniform direction is
called:
a. Voltage drop
b. Electric current flow
c. Potential difference
d. Electromotive flow Correct Answers b. Electric current flow
(4-078-1.8) A material that transfers electric charge is called:
a. An insulator
b. A conductor
c. A circuit
d. A wire Correct Answers b. A conductor
(4-078-1.9) If an electrical _____ is placed across a conductor,
the electrons will drift from the negative end towards the
positive end of the conductor.
a. Potential
b. Current
c. Resistance
d. Wire Correct Answers a. Potential
(4-078-2.1) A closed electrical circuit will:
a. Close-off the flow of current
b. Be series only
c. Be parallel only
, d. Allow current to flow Correct Answers d. Allow current to
flow
(4-078-2.2) The purpose of having an upward movement of a
switch handle to close the switch is:
a. To have the handle out of the way
b. To meet the requirements of the electrical codes
c. It indicates the condition of the circuit
d. To prevent the switch from closing due to gravity Correct
Answers d. To prevent the switch from closing due to gravity
(4-078-2.3) An open circuit is one in which:
a. A switch is closed
b. The wires are bare
c. A switch is open
d. Voltage may exit Correct Answers c. A switch is open
(4-078-2.4) An electrical device that is designed to start and stop
current flow is the:
a. Power supply
b. Fuse
c. Circuit breaker
d. Switch Correct Answers d. Switch
(4-078-2.5) A triple pole single throw switch is one that:
a. Opens and closes three wires of an electrical circuit
b. Has three magnetic poles
