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Electrical Engineering Interview Questions

WE are using a 63A MCCB(SIEMENS MAKE) for one of the feeder in LV substation panel.It is supplying to a lighting & power socket DB.Settings in the MCCB is Ir = 63 * 1 , Isd = 8 times of Ir , tsd = 0.5 sec( I2 t off). Sometimes this MCCB is tripping .But no trip in DB MCB. Can anybody tell me reason ? From where i can know about the MCCB settings?

8291

how to reduce earth to neutral voltage?

21483

what is the differnce of STATIC ENERGY METER FROM ordinary energy meter?

2150

Any one can explaination about calibration with rotating sub standards?

1126

What is the basic working principle of Tri vector meter?

TCS,

27673

What is the difference between double compression

54172

how current flows in circuit?

12246

What is the current flow in 230v ac supply ? What is the current flow in 415v Ac supply ?

27413

15841

what type of earthing is done on hilly rocks.

14000

what is the difference between Earthing,Grounding and neutral?

4929

What is the output voltage of a DG set.

6814

Why PT voltages are measured with respect to ground? What do u mean by voltage or current polarized.

1454

I am inpecting a 10kVA UPS what tests should i do and should i observe?

1340

what do you mean by synchronous speed of a three phase induction motor?

11505

Un-Answered Questions { Electrical Engineering }

list the type of vfd? wich is sutable for heating kiln?

1194

PLEASE INFORM ABOUT THE IDEAL TEST RESULTS OF MAGNETIC BALANCE TEST OF TRANSFORMER 33/11 kv DELTA-STAR T/F

1388

suri transmission

3717

why the projects getting loss?

1014

armature winding of dc machine produce alternating emf then it convert in to dc by using commutator.But only we consider armature resistance why don't we consider inductive reactane effect?

1204

Earth bits close or open. Which is correct

871

what is the IS foe lightning arrester?

1282

how r charge carriers produced

1147

how we can decide that what value of ht line will come to any commercial building? (ans except According to the building load)

853

I have a small system with two motors that are running on 380 vac, 60 hz. These motors are expensive and I usally get them from Brazil. I am adding another motor to the system, but I want to purchase a 480 vac, 60 hz motor to use. It will be on a VFD that is rated fro 380 thru 480. Is this posible and will I have to use a larger motor and derate it?

1109

what is the difference between ups & inverter

4349

what is differant beetween overload current and phase current?

1375

why to use freewheeling diode ( diode in revers bias mode) across dc coil

2839

define the non synchoronism of synchoronous machine in general g or m??

1121

why Induction Generators are not "Black start" ? and apart from WTGs where this types of generator are generally used?

1819