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Electrical Engineering Interview Questions

why dc is used in control circuits for MV & LV switchgeras instead of ac

1031

why dc is used in control circuit for mv & hv switchgear instead of ac

1059

what is the meaning of 0.5ohm Resistance

917

Advantage of 11KV ring main system with open point

1326

Why Utility Distribution System in India is mainly at 11 kV? Why not Utility go for 33 kV?

913

how we explain parallel paths armature winding?

1076

why 15 kw motor winding resistance is low then 5 kw motor winding resistance?

1601

The coils having selfinductancs 10mh and15mh,effective inductance 40mh when connected in series aiding. what will be the equivalent inductance if we connect them in series opposing?

BSNL,

1041

what is the Pickup/drop off ratio in BCPU relays

2998

What is the breaking capacity of transformer and how can we calculate the breaking capacity of tranformer

860

The magnitude of sum of two sinusoidal av voltage is equal to 230 volt.the magnitude of each individual voltage is also equal to 230 volt.what must be the phase difference between voltages?

788

Three phase power is measured with two wattmeeter for balance three phase load.the reading of one wattmeter is zero.we can conclude that the power factor of balance load is?

1007

Consider three heater bank connected in 3 phase star with neutral.Each heater bank connected in each phase.So each phase get 230 volts supply.my question is,during balance condition, current flow in neutral or Not

808

How to calculate multiplying factor of dc energy meter

810

I have a 380 KVA DG set. How can i find out 1. My Fuel Consumption per hr ? 2. Electricity produced in 1 Hr. ? 3. If load varies then how does it affect fuel consumption & electricity produced ? Please HELP !!! Really need an answer.

1655

Un-Answered Questions { Electrical Engineering }

Do u know any one? how to find out in motor rated amps? formula?

1078

Where voltage are high and current to be interrupted is low the breaker preferred is:

1224

what is the criteria for selecting fuse rating in 1phase, 2phase & 3phase welding sets?

987

what is the difference between RMS & TRUE RMS VOLTAGE

1972

Define early construction of human being

1040

What is the meaning of floating point earthing in battery backed systems ?

1093

How i can decide that HVDC line is best for transmission.

1073

Convert a star connected network into a delta connected network.

261

If Neutral Grounding Resistor (GR) failed/shorted. Is it repairable.

766

What is the unit of charge and current?

252

During Starter Panel Com missing I Found The Main Incomer 40Amp MCB 10KA Trip When Motor Change Star To Delta Motor Rating 20HP BUT When We Use Same MCB To Other Motor It Does Not trip Or What Is Necessaries for Star Delta Starter MCB SFU MPCB OR MCCB And What are The Breaking Capacity of MCCB in the Motor above 15HP

1058

A d.c. Shunt motor is found suitable to drive fans because they require?

256

what is the difference between directional & non directional earth fault with example please explain.

900

what is the effect of vector group while phase sequence of a generator changes,whether the vector group changes or not

1257

what are the standard IR values should be of R-E, Y-E, B-E, R-Y, Y-B, B-R of VCB in closed condition and in open condition for 500KVA & 1000KVA transformers. and what is the acceptable range when tested by 5000V megger.

1384