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

inductive heating

saturation

zero sequence

repeating

Question 1 of 20

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

General notes

Catalog sheet

Schedule

Wiring diagram

Question 2 of 20

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

24V

12V

240V

120V

Question 3 of 20

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

Three

Four

Five

Two

Question 4 of 20

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

Ratio test

Insulation resistance test

Heat scanning test

Core ground test

Question 5 of 20

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

one-line diagram

legend

title block

revision notes

Question 6 of 20

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

cable or termination section

interrupter section

cubicle section

unit substation

Question 7 of 20

8. 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 110.9

NEC Section 310.120

NEC Section 230.95

NEC Section 250.20(B)

Question 8 of 20

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

gray

yellow

black

red

Question 9 of 20

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

overload rating

rated current

interrupting rating

trip current

Question 10 of 20

11. Circuit breaker ratings are given ________.

in units of induced voltage

on the handle in black print

in terms of interrupting voltage

on the breaker nameplate

Question 11 of 20

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

saturation characteristics

physical size

available space

BIL

Question 12 of 20

13. Connection diagrams should be used to ________.

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

show the actual wiring connections between unit assemblies or equipment

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

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

Question 13 of 20

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

OHM

OSC

CRO

Question 14 of 20

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

Outdoor

Sealed

Vacuum

Donut

Question 15 of 20

16. The basic purpose of switchgear is to ________.

provide protective grounding for equipment

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

insulate conductors from hazardous atmospheres

provide power system protection by automatically isolating faulty components

Question 16 of 20

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

instrument transformers

distribution transformers

pole-mounted transformers

sealed self-cooled transformers

Question 17 of 20

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

manufacturer's trademark

identification of phase wires

location of disconnecting means

date fault current calculations performed

Question 18 of 20

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

50'

100'

10'

25'

Question 19 of 20

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

20A

30A

10A

Question 20 of 20

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