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Electrical Engineering Interview Questions

how can we convert 48V dc into 12 V dc? Any standard device for it??

3563

hwat type of motor is used in thermal gas turbine hydro nuclear power plants and why

Bhel,

1042

In a power system we know that if the generated power is less than the load then the frequency of the system is decreases.So does this mean that total required load is delivered at alower frequency?

1861

what is The difference between national electrical code and I.S.Code (electrical) and what is the value of NEC in electrical engineering field

1037

An 11kv system consisting of an underground cable to a sub station about 300 meters away was shut down for about 10 hrs. On energising, it tripped off on earth fault about 10---20 mins later 6 times but since than it is not tripping.its already 3 weeks now. The SPAJ was found to be fine. what could be the cause.No test had been done to determine the cause of the trippings till now because of demand.

3012

How can i check a relay good or not?

3064

DEAR SIR, HOW TO CALCULATE WELDING TRANSFORMER CAPACITY IN KW OR KVA (POWER). TWO WELDING TRANSFORMER USED WHAT TYPE OF DG SET CAPACITY LIKE ( 45 KVA OR 62.5 KVA), PLEASE TELL THE WELDING TRANSFORMER RATEINGS. I AM REFINARY (TANKS WELDING) THANKING YOU

8132

Why transformer, generator, ups rating kva?

4420

in alternator why on load terminal voltage is less than no load teprminal voltage

2188

Why we use parllel operation of alternator

2231

need of capacitor used in plant

3169

In a generator (Synchronous) does the rotor speed (frequency) corresponds to the speed of the water (in hydro). does the torque on the turbine relate to the flow of water?

2663

When in a large power system if the demand of power is larger than the generated power the frequency of the power system drops.(assume the rated frequency is 50Hz and now it is 49Hz) So does this mean the demand is totally supplied with a lower value of generated power in a lower frequency?

2125

what is slip what is the use of slip?

1152

How can decide the MVA rating of power transformer for substation like 220/132, 132/66, 66/33kv etc or even higher kv rating of substation???? Send me the strictly technical answer that shows your strong technical aptitude.

25116

Un-Answered Questions { Electrical Engineering }

When the relative speed between the magnetic fields of stator and rotor does is zero under steady state operation?

267

If ROC does not lies inside unit circle,then ? a) Fourier transform converges b) Z transform converges c) Hatly transform converges d) Colpit Transform converges.

1068

Why let through energy not considered for ACB breaker while cable sizing?

1348

what are the basic insulation levels & what its Unit

1033

How to calculate the volumetric capacity of a oxygen & Nitrogen gas Cylinder if pressure is 145 kg/cm2 & water capacity of cylinder is 67 liters.

1280

cc of scorpio?

1296

what is mathed of check the D.C MOTOR 181 KW (ARMATURE AND FIELD) WHAT IS THE MATHED OF CHECK THE THYRISTOR MODULE (HIGH CURRENT)

1065

why do you add the load short circuit impedance when considering short circuit amperage. It seems that you should only consider supply. If you need to consider loads and you don't know what loads are to be added , what would be a good sub-transient reactance rating for the loads?

1006

What is the previous name of Cox's Bazar

1181

1.why we are using blocks in withoutgaplightning arrester 2.why we ar using bushing in withoutgap lightning arrestor

1092

what is the pulse and audio frequency transformer? what is different between induction regulators and tap changing transformer?

1232

Why delta star trformers are used for lighting loads?

211

Define the overload capacity of the motor?

1141

In a simple spur gear train, gears with 24, 48, 32, 72 and 96 teeth are in sequence. The gear with 24 teeth runs at 900 rpm. The speed in rpm of gear with 72 teeth is

258