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

Four

Three

Five

Two

Question 1 of 20

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

interrupting rating

rated current

overload rating

trip current

Question 2 of 20

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

distribution transformers

instrument transformers

pole-mounted transformers

sealed self-cooled transformers

Question 3 of 20

4. 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 250.20(B)

NEC Section 110.9

NEC Section 310.120

Question 4 of 20

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

25'

10'

100'

50'

Question 5 of 20

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

OSC

CRO

OHM

Question 6 of 20

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

Vacuum

Sealed

Donut

Outdoor

Question 7 of 20

8. The basic purpose of switchgear is to ________.

provide protective grounding for equipment

insulate conductors from hazardous atmospheres

provide power system protection by automatically isolating faulty components

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

Question 8 of 20

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

Core ground test

Heat scanning test

Insulation resistance test

Ratio test

Question 9 of 20

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

120V

12V

24V

240V

Question 10 of 20

11. Circuit breaker ratings are given ________.

in terms of interrupting voltage

in units of induced voltage

on the handle in black print

on the breaker nameplate

Question 11 of 20

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

black

yellow

gray

red

Question 12 of 20

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

20A

30A

10A

Question 13 of 20

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

revision notes

title block

one-line diagram

legend

Question 14 of 20

15. Connection diagrams should be used to ________.

show the actual wiring connections between unit assemblies or equipment

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

Question 15 of 20

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

saturation

inductive heating

zero sequence

repeating

Question 16 of 20

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

location of disconnecting means

identification of phase wires

date fault current calculations performed

manufacturer's trademark

Question 17 of 20

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

cubicle section

interrupter section

cable or termination section

unit substation

Question 18 of 20

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

saturation characteristics

physical size

BIL

available space

Question 19 of 20

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

Wiring diagram

General notes

Schedule

Catalog sheet

Question 20 of 20

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