Electricity level 3 section 6

The resistance of switchgear should be checked using a

1,000V megger

What is a standard output voltage of potential transformers?

120V

When performing themographic surveys, a major deficiency is indicated by a gradient of

16 deg C

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

25ft

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

CRO

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

Heat scanning test

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

cable or termination section

Field marking of service equipment shall include the

date fault current calculations performed

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

gray

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

instrument transformers

Nonstandard abbreviations on electrical prints will typically be defined on the

legend

Which of the following is a current transformer?

oil-filled

Circuit breaker ratings are given

on the breaker nameplate

A downed power line is most likely to result in a(an)

phase failure

The basic purpose of switchgear is to

provide power system protection by automatically isolating faulty components

The continuous current that a circuit breaker can carry without exceeding a standard temperature rise is known as the

rated current

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

saturation characteristics

Connection diagrams should be used to

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

The maximum 60Hz voltage that can be applied to a switch for one minute without causing insulation failure is known as the

withstand rating

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

zero sequence