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

rated current

interrupting rating

trip current

overload rating

Question 1 of 20

2. The basic purpose of switchgear is to ________.

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

provide protective grounding for equipment

Question 2 of 20

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

revision notes

one-line diagram

legend

title block

Question 3 of 20

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

physical size

saturation characteristics

BIL

available space

Question 4 of 20

5. 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 5 of 20

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

inductive heating

zero sequence

repeating

saturation

Question 6 of 20

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

10'

50'

25'

100'

Question 7 of 20

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

red

yellow

gray

black

Question 8 of 20

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

OHM

CRO

OSC

Question 9 of 20

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

30A

10A

20A

Question 10 of 20

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

Ratio test

Insulation resistance test

Core ground test

Heat scanning test

Question 11 of 20

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

distribution transformers

sealed self-cooled transformers

pole-mounted transformers

instrument transformers

Question 12 of 20

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

24V

12V

120V

240V

Question 13 of 20

14. 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 310.120

NEC Section 250.20(B)

NEC Section 110.9

NEC Section 230.95

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. Field marking of service equipment shall include the ________.

manufacturer's trademark

location of disconnecting means

date fault current calculations performed

identification of phase wires

Question 16 of 20

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

cubicle section

unit substation

interrupter section

cable or termination section

Question 17 of 20

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

Five

Four

Three

Two

Question 18 of 20

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

General notes

Schedule

Wiring diagram

Catalog sheet

Question 19 of 20

20. Connection diagrams should be used to ________.

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

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 20 of 20

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