Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

NETA 2 > Round 2 > Flashcards

Round 2 Flashcards

1
Q

Why is a ground grid extended beyond the main system?

A

Worker protection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the minimum insulation-resistance test voltage for a metal-oxide surge arrester rated 15kV with an MCOV rating of 12.7kV per NETA standards?

A

2,500 VDC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

At what voltage does an arc flash hazard not exist?

A

None

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Cable limiters and other current limiting devices should not be connected to the supply side of a service disconnect.(T/F)

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the preferred method of performing primary-injection testing on a low voltage circuit breaker with ground fault protection?

A

Use manufacturers kit or rewire neutral

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

A given feeder supplies a continuous load of 20 amperes and a non-continuous load of 10 amperes. The minimum overcurrent device rating is:

A

35A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What instrument would normally be used to measure the winding resistance of a transformer?

A

Kelvin bridge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Liquid samples for dissolved gas analysis should be collected in:

A

Very specific containers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

You have a 3-phase circuit with 250kvar and 480v, what is your current?

A

300.7 A

Help: I = kVAR / (V*sqrt(3))

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Least likely reason for a fused low voltage circuit breaker to trip free.

A

Lubrication of Trip Mechanism

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Types NM, NMC, and SE cables can be used for feeder temporary installations without height limitation and without concealment.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What would be the appropriate maintenance test voltage for an AC withstand test on a 15kV, 1600A rated metal-enclosed interrupter switchgear with stress cones?

A

27kVAC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

A wye-delta transformer has a turns ratio of 2:1. It has a secondary line voltage of 480 V. The secondary is connected to a wye-connected three-phase resistive load of 50 ohms in each phase. How much is the secondary line current?

A

5.54A

Y Circuits:
V_Line = sqrt(3) * V_Phase
I_Line = I_phase

Delta Circuits:
V_Line = V_Phase
I_Line = sqru(3) * I_Phase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Which is the “Can’t Let Go” range of current flow?

A

9-25 mA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the Restricted Approach Boundary for a 50V system?

A

Avoid contact

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

On a 87 diff relay, the tap screw was found to be loose but tripped. What would cause it to be come loose?

A

Inadequate maintenance

17
Q

When verifying a GF delay band using the manufacturers time curve, the industry standard is to apply current that is _______ times the GF pickup setting.

A

1.5

18
Q

In an electrical transformer, 10% rise in temperature will reduce the life of the insulation by ___ .

A

1/2

19
Q

How much PCB oil can be spilled before reporting to the EPA?

A

More than 10 pounds

20
Q

One advantage DC type motors have over AC types is that:

A

their speed can be easily varied

21
Q

The alternate source for emergency systems are required by the NEC to have ground-fault protection of equipment.

A

False

22
Q

Excitation-current tests of large dry-type transformer windings are required for maintenance testing but not acceptance testing.

A

True

23
Q

The maximum displacement past the resting position that circuit breaker contacts reach during their operation is defined as:

A

Overtravel

24
Q

Non load break cable connectors may be used as a disconnecting means in an emergency situation.

A

True

25
Q

What would cause a low specific gravity in a battery?

A

Charge voltage set too low

26
Q

What is the minimum insulation-resistance test voltage for a switchgear rated 34kV per NETA standards?

A

5,000 VDC

27
Q

What is the minimum insulation-resistance in Mega-Ohms for a switchgear rated 2.5kV per NETA standards?

A

500 Mega-Ohms

28
Q

What is the minimum insulation-resistance in Mega-Ohms for a surge arrester rated 8kV per NETA standards?

A

2,500 Mega-Ohms

29
Q

What would be the appropriate maintenance test voltage for an AC withstand test on a 38kV, 2000A rated metal-clad switchgear?

A

60kVAC

30
Q

What would be the appropriate maintenance test voltage for an AC withstand test on a 27kV, 1200A rated metal-enclosed interrupter switchgear with stress cones?

A

45kVAC

31
Q

A given feeder supplies a continuous load of 40 amperes and a non-continuous load of 30 amperes. The minimum overcurrent device rating is:

A

80A

32
Q

A given feeder supplies a continuous load of 12 amperes and a non-continuous load of 20 amperes. The minimum overcurrent device rating is:

A

35 A

NETA 2 (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions