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1. The basic purpose of switchgear is to ________.

insulate conductors from hazardous atmospheres

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

Question 1 of 20

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

Wiring diagram

Schedule

Catalog sheet

General notes

Question 2 of 20

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

date fault current calculations performed

identification of phase wires

location of disconnecting means

manufacturer's trademark

Question 3 of 20

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

red

gray

black

yellow

Question 4 of 20

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

10A

30A

20A

Question 5 of 20

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

CRO

OHM

OSC

Question 6 of 20

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

interrupter section

cable or termination section

unit substation

cubicle section

Question 7 of 20

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

overload rating

interrupting rating

trip current

rated current

Question 8 of 20

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

revision notes

one-line diagram

legend

title block

Question 9 of 20

10. Circuit breaker ratings are given ________.

in terms of interrupting voltage

in units of induced voltage

on the breaker nameplate

on the handle in black print

Question 10 of 20

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

Heat scanning test

Insulation resistance test

Ratio test

Core ground test

Question 11 of 20

12. 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 250.20(B)

NEC Section 230.95

Question 12 of 20

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

10'

100'

25'

50'

Question 13 of 20

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

zero sequence

saturation

repeating

inductive heating

Question 14 of 20

15. Connection diagrams should be used to ________.

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

show the actual wiring connections between unit assemblies or equipment

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

distribution transformers

pole-mounted transformers

sealed self-cooled transformers

instrument transformers

Question 16 of 20

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

Five

Two

Three

Four

Question 17 of 20

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

Donut

Outdoor

Vacuum

Sealed

Question 18 of 20

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

120V

24V

12V

240V

Question 19 of 20

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

available space

physical size

saturation characteristics

BIL

Question 20 of 20

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