a.)Ammeter and Voltmeter read rms value or avg. value ? b.)What are symmetrical

a.)Ammeter and Voltmeter read rms value or avg. value ?
b.)What are symmetrical and Unsymmetrical faults?

Question Posted / raj

2 Answers
6074 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

a.)Ammeter and Voltmeter read rms value or avg. value ? b.)What are symmetrical and Unsymmetrical f..

Answer / denzel101

Ammeters and voltmeters read R.M.S values

Symmetrical faults are balance faults occuring in power
system. For a fault to be classified as symmetrical, all
three phases must draw equal fault currents and the phase
displacement must remain 120 degrees. examples

1. all phases shorted to each other.
2.all three phases shorted to earth.

Unsemmetrical faults occurs when one or two phases are
shorted to earth or two phases to each other.the faulty
phases will draw fault currents which are not equal in
magnitude with healthy phases and does not have 120 degree
phase displacement.

Is This Answer Correct ?

8 Yes

1 No

a.)Ammeter and Voltmeter read rms value or avg. value ? b.)What are symmetrical and Unsymmetrical f..

Answer / anil

ammeter and voltmeter always reads R.M.S value of the measurement only

and when comes to faults
symmetric faults: 3 phase faults
unsymmetrical faults:
1. L-L FAULT
2. L-G FAULT
3. L-L-G FAULT

Is This Answer Correct ?

2 Yes

1 No

Post New Answer

More Electrical Engineering Interview Questions

Why Neutral Earthing pits and body earthing is interconnected

3 Answers Taj Group,

How can we calculate the rating of a transformer suppose if load is 1000KW?Formula?

3 Answers

my b-tech percentage is 50%. what answer will satisfy the hr ?

0 Answers Wipro,

In wat way the power compensation takes place when a statcom is connected in a transmission line

1 Answers

which network topology offers the greatest level of tolerance?

0 Answers

In pakistan appliances work on 220v at 50hz and in us appliances work on 110v at 60hz what is basic theory to explain it

1 Answers SNGPL,

arrange to send solved question and answer its easy to study and understand the thing, because of Exam is to be conducted shortly

1 Answers

Why (In India) we preferably go for +-30 deg connection of transformer? what are the advantages in this connection?

2 Answers

what is the Transformer Protection & Type ??

4 Answers GE,

why on delay timer used for fully automatic star delta starter?

0 Answers

what is the difference between earthed and unearthed cable?

24 Answers Cords Cable, Essar, Torrent Power,

Where we give genset o/p in home & industrial applications ?

1 Answers

For more Electrical Engineering Interview Questions Click Here