13- EHS Section 9

Question 1

1. What is arc-over in electrical terminology?
   a) Low impedance path
   b) Electrical backfeed
   c) High voltage jumping through intense fire or smoke
   d) Power factor correction

Answer 1

C
A term used to describe the phenomena of high
voltage electricity jumping through intense ire or
smoke to ground. This terminology was chosen to
avoid confusion with the word “flashover” which
has different meanings for power line maintainers and fire fighters.

Question 2

What is electrical backfeed?
a) Low impedance path
b) Hazardous electrical current, from a secondary side of transformer
c) Common connection for conductors
d) Power factor correction

Answer 2

B
Hazardous electrical current that may exist due to
a power source feeding through the low voltage
(secondary) side of a transformer, or any other
source of electrical energy.

Question 3

What is a bonded connection?
a) Low impedance path
b) Common connection for conductors
c) Path for fault current
d) Capacitor in a circuit

Answer 3

A
A low impedance path obtained by joining all noncurrent carrying metal parts to ensure electrical continuity and having the capacity to safely conduct any current likely to be imposed on it.

Question 4

What does the term “bus” refer to in electrical terms?
a) Low impedance path
b) Conductor serving as a common connection
c) Device for power factor correction
d) Enclosed space for electrical work

Answer 4

B
A conductor which serves as a common
connection for the conductors of two or more
electrical circuits.

Question 5

In electrical systems, what does a capacitor do?
a) Provides power factor correction
b) Acts as a low impedance path
c) Ensures dielectric resistance
d) Isolates wires and equipment

Answer 5

A
A device typically installed in transmission,
distribution and industrial systems to provide
power factor correction. The device improves
system voltage and reduces electrical energy line
losses.

Question 6

When an electrical switch is “closed,” what does it mean?
a) The circuit is de-energized
b) The contact points are touching, and the circuit is energized
c) The fault current is flowing
d) The switch is isolated

Answer 6

B
When used to convey the position of an electrical switch, it means that the contact points are touching and the circuit is energized.

Question 7

What is a confined space in electrical safety?
a) A space with low impedance
b) An enclosed space with atmospheric hazards
c) A space with high fault current
d) A space with power factor correction devices

Answer 7

B
A fully or partially enclosed space, that is not both
designed and constructed for continuous human
occupancy, and in which atmospheric hazards
may occur because of its construction, location or
contents or because of work that is done in it.

Question 8

How is current in electrical terms compared?
a) To the rate of water flow in a pipe
b) To the resistance of materials
c) To the atmospheric conditions
d) To the voltage potential

Answer 8

A
A low of electric charge. Can be compared to the
rate of low of water in a pipe. Current is typically
measured in amperes (amps).

Question 9

What does it mean for equipment to be “de-energized”?
a) Isolated and grounded
b) Connected to earth
c) Energized and grounded
d) Disconnected and isolated

Answer 9

D
In the electrical energy sense the equipment is
isolated and grounded (electrically connected
to earth).

Question 10

What is a dielectric in electrical terminology?
a) A low impedance path
b) A device for power factor correction
c ) tools and equipment that are designed to withstand the low of very high
voltage electricity
d) A type of conductor

Answer 10

C
A term used to describe tools and equipment that
are designed to withstand the low of very high
voltage electricity (100,000 or more volts).

Question 11

What is fault current?
a) The maximum electric charge when a circuit is open
b) The current flowing through a closed circuit
c) The maximum electric charge when a device or circuit fails
d) The current in a low voltage circuit

Answer 11

c
The maximum electric charge (energy) that will
low through a neutral or ground wire when an
electrical device or circuit fails.

Question 12

What is a fuse cutout used for in distribution power lines?
a) Power factor correction
b) Protecting equipment from power fluctuations
c) Creating a low impedance path
d) Isolating wires from the ground

Answer 12

B
A combination fuse and switch typically used on
distribution power lines to protect equipment
from power fluctuations in the same way that
fuses are used in a building to protect circuits.

Question 13

What does grounding involve in electrical safety?
a) Isolating wires
b) Providing power factor correction
c) Connecting wires and equipment to earth
d) Creating a closed circuit

Answer 13

C
Is the process of mechanically connecing isolated
wires and equipment to the earth with suicient
capacity to carry any fault current and to ensure
the wires and equipment remain at the same
potenial (same voltage) as the earth (ground).

Question 14

At what voltage level is electricity considered high voltage?
a) Above 1000 volts
b) Above 500 volts
c) Above 750 volts
d) Above 2000 volts

Answer 14

C
Any voltage above 750 volts. Also referred to as
primary voltage.

Question 15

What does it mean for equipment to be isolated?
a) Connected to earth
b) Physically disconnected or separated
c) Grounded
d) Energized and closed

Answer 15

B
Physically disconnected or separated from sources
of dynamic energy by approved procedures or
specifically designed devices

Question 16

What is induction magnetic in electrical terms?
a) Building up static charge
b) Voltage potential between objects
c) Energizing wires through magnetic fields
d) Isolating wires from the ground

Answer 16

C
The phenomena where isolated wires running
parallel and close to a live wire can become
energized by the magnetic field created by the
current. The strength of the induced voltage is
dependent on atmospheric conditions, distance of paralleling, proximity and voltage of the energized power line

Question 17

What is induction electrostatic?
a) A device for power factor correction
b) Building up static charge on an object
c) A closed electrical circuit
d) Insulating wires from each other

Answer 17

B
A build up of static charge on an object as it
moves through a high voltage area such as a
substation.

Question 18

What does “insulated” mean in electrical terminology?
a) Connected to earth
b) Separated from other conducting surfaces
c) Creating a low impedance path
d) Grounded and closed

Answer 18

B
Separated from other conducing surfaces by a
dielectric substance or air space that provides
a high resistance to the passage of electrical
current.

Question 19

What is the abbreviation kV used for in electrical terms?
a) Kilovolt
b) Kinetic voltage
c) Kilowatt-hour
d) Kinematic voltage

Answer 19

A
The short form for kilovolt is kV. One kilovolt is
equal to 1000 volts.

Question 20

At what voltage range is considered low voltage?
a) 500 to 1000 volts
b) 31 to 750 volts
c) 1000 to 2000 volts
d) 750 to 1500 volts

Answer 20

B
Any voltage from 31 to 750 volts inclusive.

Question 21

What is the part of an electrical circuit that provides the return path to ground?
a) Capacitor
b) Neutral
c) Bus
d) Conductor

Answer 21

B
The part of an electrical circuit that provides the
electric charge a return path to ground.

Question 22

What does “open” mean in the electrical industry?
a) Creating a low impedance path
b) A space designed for continuous human occupancy
c) Electrical energy cannot flow due to a broken circuit
d) Connecting wires to the ground

Answer 22

C
A common term used in the electrical industry,
which means that electrical energy cannot low
because the position of a switch has broken the
continuity of the circuit

Question 23

What is electrical potential?
a) The rate of electric charge flow
b) The difference in electrical charge between two objects
c) The resistance to the passage of electrical current
d) The current in a closed circuit

Answer 23

B
A term commonly used in the electrical industry.
When used in the electrical sense, it means the
difference in electrical charge between any two
objects capable of carrying an electrical charge.
Electrical potential is measured in volts
(see voltage).

Question 24

What is a power line in electrical terms?
a) A conductor serving as a common connection
b) The part of a wire intended to carry electrical energy
c) A device for power factor correction
d) A closed electrical circuit

Answer 24

B
That part of a metal wire or cable intended to
carry the low of electrical energy.

Question 25

What is a recloser used for in electrical systems?
a) Power factor correction
b) Protecting high voltage power lines
c) Creating a low impedance path
d) Isolating wires from each other

Answer 25

B
An automatic switch-like device that is used to
protect high voltage power lines. These devices
are typically set to “reclose” or “reset” a number
of times before remaining in an open position and
shutting of the power.

Question 26

What is Resistance in electrical terms
A) rubbing of wires
B) similar to friction water
C) movement of power

Answer 26

Is similar to the effect of friction on the low of
water in a pipe. (Water lows more freely in a large
pipe than in a small one.) Different materials have
different resistance to the low of electricity. Very
high resistance materials are called insulators,
while the low resistance materials are called
conductors. Resistance is measured in ohms.