Brainscape's Knowledge GenomeTM

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


See full index

High Voltage Cable > High Voltage Questions Worksheet > Flashcards

High Voltage Questions Worksheet Flashcards

1
Q

True or False. A 25kV, URD HV cable will have stand and insulation shielding in its construction

A

True

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

True or False. For HV cables, the insulation thickness will increase with voltage increases

A

True

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

True or False. Extra high voltage cables will have a thermoset insulation in the middle channel of the cable

A

False. Liquid or gas

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

True or False. A common type of medium-voltage cable in general use today is Teck cable

A

True

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

True or False. Dielectric strength of a material is the ability of the dielectric to withstand electrical breakdown under the influence of frequency

A

False. Voltage stress

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

True or False. Dielectric strength will increase if a dielectric becomes heated

A

False. This weakens the insulation

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

True or False. XLPE is a thermoset plastic

A

True

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

True or False. IEEE classifies high voltage as 115,000 - 230,000V

A

True

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

True or False. Some large electric motors operate at voltages as high as 13.8kV

A

True

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

True or False. Most HV alternators generate electric power at voltages between 20kV and 40kV to reduce line losses

A

False. 10kV to 20kV

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

True or False. The voltages used in the transmission system are generally 60kV - 765kV for BC Hydro

A

False. 500kV max

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

True or False. PVC is a thermoplastic material

A

True

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

True or False. The conductor shield overcomes the problem of ionized air between the conductor strands

A

True

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

True or False. The insulation shield creates an equidistant radial flux in the insulation

A

True

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

True or False. If the insulation shield was constructed of lead it would also prevent the ingress of moisture into the cable

A

True

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

True or False. The grounded shield acts to protect life in the event of mechanical damage to the cable

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

True or False. 100% insulation is used in grounded systems, where ground faults are eliminated in no more than one hour

A

False. 133%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

True or False. Cable armour provides HV cable with mechanical protection

A

True

19
Q

True or False. A pothead is a termination method that has been traditionally used on shielded Teck power cables

A

False. PILC cables

20
Q

True or False. Its better to have a creep age distance a little too long, as opposed to too short when terminating HV cable

A

True

21
Q

True or False. Moisture and contaminants on the insulation could cause current tracking and flashover

A

True

22
Q

True or False. Splicing a HV cable is considered more difficult than terminating a HV cable

A

True

23
Q

True or False. A common reason for a HV splice to fail is air getting trapped in between layers of insulation

A

True

24
Q

What is the process called when air breaks down and becomes a conductor?

A

Ionization

25
Q

What represents a power loss in lines and can cause radio and TV interference?

A

Corona

26
Q

What is is called when current tries to flow across insulation to ground?

A

Tracking

27
Q

What is used on HV insulators and cable terminations to increase the creepage distance?

A

Skirting

28
Q

The ability to withstand a very high voltage for short duration is called ________

A

Impulse voltages

29
Q

What is created on the insulation surrounding a conductor due to an electrostatic field?

A

Electric stress

30
Q

Created because the flux concentrations are decreasing with distance which means the stress on the insulation decreases with distance

A

Voltage gradient

31
Q

The result of dust collecting on HV insulators or terminations

A

Flashover

32
Q

Relates to the minimum separation required between energized HV conductors

A

Strike Distance

33
Q

True or False. An electrostatic field is due to conductive air

A

False. Voltage

34
Q

True or False. A radial system is an expensive form of HV supply for rural locations

A

False. It is the cheapest

35
Q

True or False. A ring system is also called a loop system

A

True

36
Q

True or False. A network system is essentially a loop system with additional interconnecting ties

A

True

37
Q

True or False. The network system is used for supplying HV power to major airports

A

True

38
Q

True or False. Lightning arresters are connected in parallel to the load

A

True

39
Q

True or False. Reactors are connected in series to the load

A

True

40
Q

True or False. Unit substations are common used for the supply of large industrial and commercial installations

A

True

41
Q

True or False. A substation that contains HV equipment is usually located outdoors and includes disconnects, circuit breakers, power transformers, lightning arresters, etc

A

True

42
Q

True or False. A radial system used for the supply of power for rural locations is the easiest to protect against overload and short-circuits

A

True

43
Q

True or False. The loop system offers a higher degree of reliability than the radial system

A

True

44
Q

True or False. A HV vault must be built of concrete and located so that at least one wall is an outside wall

A

True

High Voltage Cable (6 decks)

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