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Electrical Engineering Interview Questions

types of motor starter

4002

What is the meaning of HT Trivector Meter ?

1528

i have faced a problem in ro plant grunfos make bm30type pump it is 22kw pump. We start this pump using siemens 3rw 4423-ibc44, 30kw softstarter but this soft starter will frequently failier so we planed to change dol starter. So pls tell anybudy its possible or not.

1124

ro plant grundfos bm30type pump.we start the pump using siemens 3rw 4423-1bc44, 30kw soft starter. bur its failier frequently. so we planed to change the dol starter. sp please tell me any budy its possible or not￿翿შ†

1999

how to calculate energy meter multipling factor by ct & pt raitio

4526

ful form of gis

ABB,

3410

What is the function of NGR for the parallel operation of alternator? whats happen when different rating of alternator are running with parallel?

1967

whats happen if we disconnect the NGR of alternator in running condition?. Generally we observed that transformer netrul is directly grounded but alternator connected with NGR, then ground?

3251

) why transformer cannot rotate though the principle behind induction motor is similar to a transformer

5172

What happens if 25 Hz frequency is applied for 400/200,50 Hz single phase Transformer.Will Voltage increase ?

9114

what is the working process of over & under voltage relay.

NTPC,

1150

what is power factor ?

3410

some time we open engine breaker 8.0 MW load but plant not trip. and another time engine open 4.0 MW load engine trip why? individually engine breaker open & individually emergency stop why difference?

954

The transformer which is smallest in size is and how to calculate that? The options are 100 KVA, 50 Hz 100 KVa, 100 Hz 100 KVA, 25 Hz 50KVA, 25 HZ

10555

Does voltage and current can be seperated?

3341

Un-Answered Questions { Electrical Engineering }

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)

1096

what will happen when the dc supply is given to the capacitor?

620

why T/F winding temp measurement cts are odd secondary current ie,109A/1.2A/1.4A?

919

what is the difference between capacitive and resistive voltage divider?

2494

what is self capacitance of inductor

1393

sometime battery charged and then automatically charged when rectifier ON conition, is there any chances please clarify the same.

976

WHY RATING OF VCB NOT LESS THAN 630A

1472

Which material is used for the core of a transformer and why?

230

How to select the proper VSD to operate high inertial load

863

Difference between Earthing Truck & Earthing trolly for HT panel

3267

WHAT IS THE FORMULA FOR CALCULATING CURRENT RATING(DIRECT IN GROUND OR AIR) OF ARMOURED(XLPE) CABLE OF 4C,16Sqmm?

1241

What are the advantages of a three-phase system over a single-phase system?

213

May I know how much values to be set for earth fault, over current and short circuit values at 11kv side? I have 11kv van 1250amps rating. Present it's taking load 80amps?

653

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

1086

what the principle of sincroscope?how it works?when it needed?

1331