Electrical Engineering Interview Questions

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what happen to the voltage and current in all phases when an earth fault occur in a phase in three phase three wire system(delta connected)...

if we know Fault level say 25 KA , How to decide busbar size for Distribution network of 1000 Amp Breaker ? Sample Calculation or Farmula Available or not ?

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Un-Answered Questions { Electrical Engineering }

1- XC and the RC time constant are both measures of the reaction of C to a change in ____? 2-The power factor is a numerical ratio with a value between 0 and 1 equal to the ______________ of the phase angle. 3-When V and I are out of phase because of reactance, the product of V times I is called ______________ power 4-For _____________ inductors, the branch currents can be added algebraically. 5- The ______________ power in watts can be calculated as I^2R 6-Calculate XL with L = 30mH and f = 1kHz ( I have Xl=2piFL 2*3.141592653*1kHz*30mH =188 ohms Please check) 7-A parallel RL circuit has the values, R = 5kohms, XL = 5kohms. A voltage source of Vt = 10Vrms is connected in parallel to R and L. Determine the total current, It delivered by the voltage source Vt. 8-A series RC circuit has R = 1Mohm and C = 1microF. How long would it take for the capacitor to fully discharge if it is initially fully charged? 9-A circuit has real power = 300W and an apparent power of 500VA. Determine the power factor and phase angle. 10-The time constant for an LR series circuit is T = 0.1s and R = 10ohms. Calculate the inductance L.

why in the three pin plug all 3 pins are cutted ?

explain the functions of main isolation switches

how to decide choke rating for drive?

What are the different power system losses and how can it be eliminated?

how do i work out the Amps of a incommer if i am running 1 37 KW motor and a 0,75 KW motor and some solinoids

How are load losses and no-load losses measured at site in a DG set?

What is an alternator impedance value?

what causes contact chatter when there is no demand on the air conditioning unit?

what happens when series resonance occurs?

wat is the first thing dat is needed, 2 lay a cable in some area??

EXPLAIN THE WORKING OF SERIES REACTOR IN HT CAPACITOR BANKS (FOR VOLTAGES & CURRENTS)

In DC generator, we use commutator, having no. of segments. Then how it is possible to get a half wave of voltage and current for half rotation of armature?

How eddy current generation support the idea of train braking?

What is the meaning of Insulation H for transformers????