Lesson 2

Question 1

The ? in an electrical circuit is the electromotive force of the circuit.

Answer 1

Voltage

Question 2

For current to be present in electrical circuits, the circuit has to be ? .

a. complete
b. connected to Earth
c. single-phase
d. 3-phase

Answer 2

a.complete

Question 3

In a 60-cycle AC circuit, the voltage and current change amplitude and direction ? times per second.

Answer 3

120

Question 4

In its simplest form, a capacitor is two conductors separated by insulation.

True or False

Answer 4

True

Question 5

Kaufmann discovered that keeping the conductors of an AC circuit in close proximity to each other will keep the   ?   of the circuit low.
Select one:
a. current 
b. impedance 
c. voltage 
d. wattage

Answer 5

b.impedance

Question 6

Current in an AC circuit will take which of the following paths while attempting to return to the source?

Answer 6

All conductive paths

Question 7

Equipment such as switchboards and panelboards installed in an electrical system must have adequate ? ratings to ensure that extensive damage to equipment will not result from a ground-fault or short-circuit condition.

a. environmental
b. overload
c. short-circuit current
d. wattage

Answer 7

C.Short-circuit current

Question 8

Fuses and circuit breakers are required to be marked with all but which of the following ratings?
Select one:
a. Ampere interrupting current rating (AIC)
b. Normal current rating
c. Resistance
d. Voltage

Answer 8

C.resistance

Question 9

The highest current at rated voltage that a device is identified to interrupt under standard test conditions best defines which of the following?
Select one:
a. Interrupting rating 
b. Maximum impedance 
c. Maximum resistance 
d. Maximum voltage

Answer 9

a. Interrupting rating

Question 10

The   ?   of an electrical system is the maximum current a system is capable of delivering at any point on the wiring installation.
Select one:
a. available fault current 
b. available number of phases 
c. available resistance 
d. available voltage

Answer 10

a. available fault current

Question 11

An unintentional conducting connection between two ungrounded conductors of a circuit best describes which of the following?

a. Available fault current
b. Circuit withstand rating
c. Ground fault
d. Short circuit

Answer 11

D.short circuit

Question 12

The amount of available fault current in an AC circuit is reduced by the overall ? of the circuit.

a. fuses
b. impedance
c. wattage
d. wire type

Answer 12

impedance

Question 13

A(n)   ?   is defined as an unintentional, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally non–current-carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or earth.
Select one:
a. available fault current 
b. conductor withstand rating 
c. ground fault 
d. short circuit

Answer 13

C.ground fault

Question 14

Inverse time operation of overcurrent devices means that the ? the current, the ? the device will react to the ground fault or short circuit event.

Select one:

a. faster / faster
b. higher / faster
c. higher / slower
d. lower / faster

Answer 14

B.higher/faster

Question 15

Failure of conductor insulation is not a cause of failures in high-voltage and low-voltage electrical wiring.
Select one:
True
False

Answer 15

False

Question 16

Which of the following are common causes of conductor insulation failure?
Select one:
a. Excessive voltage stress
b. Heat
c. Physical damage occurring during or after installation
d. All of the above

Answer 16

D.all of the above

Question 17

Which of the following organizations developed the formulas to determine insulated and bare conductor current withstand ratings?
Select one:
a. General Cable Company
b. Insulated Cable Engineers Association (ICEA)
c. International Association of Electrical Inspectors (IAEI)
d. International Code Council (ICC)

Answer 17

b. Insulated Cable Engineers Association (ICEA)

Question 18

Wire-type equipment grounding conductors must be capable of safely carrying high levels of available fault current for the duration of time it takes the overcurrent device for the circuit to open and clear the event.
True or False

Answer 18

True

Question 19

Which of the following test instruments is commonly used to determine the integrity of conductor insulation?
Select one:
a. Amprobe 
b. Megohmmeter 
c. Thumper 
d. Wiggy

Answer 19

Megohmmeter

Question 20

Wire-type equipment grounding conductors expressed in Table 250.122 of the NEC are approximately   ?   of the circuit conductor size.
a. 20% 
b. 25% 
C. 50% 
d. 100%

Answer 20

b.25%

Question 21

A(n)   ?   is defined as an electrically conductive path from the point of a ground fault on a wiring system through normally non–current-carrying conductors, equipment, or the Earth to the electrical supply source.
Select one:
a. effective ground-fault current path 
b. ground fault 
c. ground-fault current path 
d. short circuit

Answer 21

C,ground-fault current path

Question 22

The highest current at rated voltage that a device is identified to interrupt under standard test conditions best defines which of the following?
Select one:
a. Current rating 
b. Interrupting rating 
c. Short-circuit current rating 
d. Voltage rating

Answer 22

b. Interrupting rating