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Electrical Engineering Interview Questions

I have 1 KW, 3ph. 440v, 50 hz, cos(phi) .75, efficiency 75%(star delta connection)Motor. How to calculate line current & Phase current (1) Star connection (2) delta Connection

3999

How much CTs are required to measure th curent in DOL starting of motor?PLs explain.

3067

calculate external resistance values to add to the rotor of a slip ring induction motor. STATOR- 415 V, 3 phase delta, 1100 A, 50 Hz, 1490 rpm, pf 0,86 ROTOR - 660 V, 590 A, 50 Hz. STATOR current at each steps STEP1-600A,STEP2- 800A,STEP3-1000A,STEP4-1100A.

2565

A car's starter motor draws a current of 100 A at 12,0 V when starting the engine. The mechanical power required to turn the engine is 960 W. At what rate is energy from the battery converted to non-mechanical forms of energy?

1143

what is 6 pulse and 12 pulse inverter? Explain brifly

15971

how does a liquid starter reduce the starting currents?

1139

What is distance protection relay? where & why we use this relay?

10352

how much load should be given on 5 mva transformer

23320

what is a vector protection in transformer

1056

solar energy light efficiency & disadvantages?

1121

what is alternator?

4314

what is the difference between LT & HT Motors

L&T,

78575

what are different types of electrical windings? i know the distributed winding ,concentrated winding etc but i want some detailed information, in what condition we will use distributed,concentrated windings what are the difference between them which is best, how induced emf changes by using different types of windings 20 hours ago - 1 week left to answer

1040

what is the basic difference between capacitor and condenser ?

ABB, Essar,

44716

when the supply of MSEB is cut off & all the load of the industry is driven on generator at that time the capacitor which is connected in industry for power factor control is switched off why?

3340

Un-Answered Questions { Electrical Engineering }

a battery is having capacity 100AH and 25% charging .if a load taking 10A & connected 6 hour .what is the final condition of the battery.

783

kVA rating of ordinary transformer is increased when connected as an auto transformer because A transformation ratio increased B secondary voltage increased C energy is transferred both inductively and conductively D secondary current increased

1638

My question is abt backlog.I had dropped one subject in my second year, and completed this subject in the 3rd attempt, so how many backlogs i have got?1 or 3?plz sujjest the answer as soon as possible

1186

Explain mechanical rotational system?

225

why voltage form factor of PT are increase , when it is ecpected heigher spikes in system. how it is calculated.

1088

how define the torque in ac drive. from electrical side in the drive friquency ,voltage and current three factor is there.

1181

What is signal flow graph?

210

What is the difference between relays and contactor construction wise?

1168

why we take movement of rotor always in counter-clockwise direction in 3-phase induction motors?

1069

how to measure winding resistance of single phase motor?

1403

how to caculate cable size for diff types of loads? if anyone know the calculating procedure please tell me

569

how will reduce the voltage. if 12volt/250ma transformer toreduce 6 volt

1099

After synchronization with grid what is the demand value QKVAR and how we will maintain that?

1227

what material is the electrical housing wire made of? is there any difference for the telephone lines?

1057