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1. Equipment interrupting ratings sufficient to interrupt the current and voltage available at the line-side terminals of the equipment can be found in ________.

NEC Section 230.95

NEC Section 310.120

NEC Section 250.20(B)

NEC Section 110.9

Question 1 of 20

2. The continuous current that a circuit breaker can carry without exceeding a specified temperature rise is known as the ________.

overload rating

rated current

trip current

interrupting rating

Question 2 of 20

3. The standard secondary circuit current for a current transformer circuit is ________.

30A

20A

10A

Question 3 of 20

4. Wires from a sensor to a ground fault relay should be no longer than ________.

100'

25'

10'

50'

Question 4 of 20

5. The four basic types of current transformers are bar, window, bushing, and ________.

Outdoor

Vacuum

Sealed

Donut

Question 5 of 20

6. Circuit breaker ratings are given ________.

on the breaker nameplate

on the handle in black print

in units of induced voltage

in terms of interrupting voltage

Question 6 of 20

7. Which of the following tests is conducted in order to detect loose connections?

Core ground test

Insulation resistance test

Heat scanning test

Ratio test

Question 7 of 20

8. Circuit breakers are divided into how many general classifications?

Two

Three

Four

Five

Question 8 of 20

9. What is the standard output voltage of potential transformers?

240V

12V

24V

120V

Question 9 of 20

10. The three basic methods of sensing ground faults are ground-return, residual, and ________.

inductive heating

zero sequence

repeating

saturation

Question 10 of 20

11. Connection diagrams should be used to ________.

indicate the paths, interconnections, and component parts of an electric circuit

show the internal wiring connections between the parts that make up an apparatus

show the actual wiring connections between unit assemblies or equipment

show the wiring of instrument and electrical control devices in an elementary ladder or schematic form

Question 11 of 20

12. The voltages and currents used in the primary circuits of substations are reduced to usable levels by ________.

sealed self-cooled transformers

instrument transformers

distribution transformers

pole-mounted transformers

Question 12 of 20

13. Which of the following sections of a manufacturer drawing shows the front view of the switchboard along with dimensions?

Schedule

General notes

Catalog sheet

Wiring diagram

Question 13 of 20

14. The basic purpose of switchgear is to ________.

provide power system protection by automatically isolating faulty components

provide protective grounding for equipment

provide a grounding system for AC systems between 50V and 1,000V

insulate conductors from hazardous atmospheres

Question 14 of 20

15. Nonstandard abbreviations on electrical prints will typically be defined on the ________.

one-line diagram

title block

revision notes

legend

Question 15 of 20

16. According to the NEC®, neutral conductors size No. 6 and smaller must have a continuous marking of white or ________.

yellow

black

red

gray

Question 16 of 20

17. Field marking of service equipment shall include the ________.

date fault current calculations performed

manufacturer's trademark

identification of phase wires

location of disconnecting means

Question 17 of 20

18. Which of the following abbreviations is used on electrical drawings to represent an oscilloscope?

CRO

OHM

OSC

Question 18 of 20

19. The most important consideration for selecting a current transformer for relaying is the ________.

physical size

saturation characteristics

BIL

available space

Question 19 of 20

20. The three sections of switchgear enclosures are the front section, the bus section, and the ________.

cable or termination section

cubicle section

unit substation

interrupter section

Question 20 of 20

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