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
7245 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

Dear All, Pls let me know about ELR.... CBCT is using for singnal purpose... How it works.. any body can explain pls.......

4 Answers

while starting a liquid starter ,is there any volage drop on water/soda on tank.can we touch the tank on starting?

0 Answers

Earth leakage relay basic knowledge principle

0 Answers Radiant,

with out colour codeing on conductor how can be find what is r,what is b,what is y phases.....

0 Answers Divis Laboratories,

What is meant by reactance voltage?

0 Answers

Who is the first Bangladeshi Everest climber? Where is his home district?

0 Answers

Hi,i want to appear for IES (EEE),can any one plz help me how to apply and how to prepare

1 Answers

what is excitation/

0 Answers ABB, Tata Steel Limited,

what is XLPE cable?

2 Answers Essar,

110 KW MOTER DOL STATER 240SQ.MM CABLE MOTER AND STARTER DISTANCE IS 110 METER WHAT IS VOTAGE IN MOTER END AND SYSTEM VOTAGE IS 415 V HOW I CAN CALCULTE

2 Answers

why any normal motor have to provide star & delta winding distribution during starting?

4 Answers

If we have a 2000kva load,How much kvar capacitors we go to add to improve the power factor at 0.9?pls give the calculation and fully theory?

2 Answers ABB, Unitech,

For more Electrical Engineering Interview Questions Click Here