Electrical Engineering Interview Questions
Questions Answers Views Company eMail

will a transformer work when pulsating dc id applied to its primary?? what will be the result??

cemp,

2 4082

Why transformer rating is represent in KVA?

Bhel, Sonalika, Usha Martin, Wipro,

7 10272

What is switch disconnector fuse?

1 3367

why transformer fuse wire is very thin as compared to home fuse wire while voltage lavel is low

1 3402

what is the purpose of silicon dropper used in battery charger?

KNPC,

6633

why back up fuse used in vacuum magnetic contactor?

KNPC,

1 3260

how to find value of resistance when 1 kw consumption for 10 minutes

Manipal Hospital,

1 2835

when the motor was star position that is running ok but when the motor was delta it was tripped? why?

Nimbus, SEL Manufacturing,

5 5199

I want to know Electrical Circuit?

1701

what are difference between indoor and out door substation

1 5977

what is transformer tap change HT side and LT side

Alstom, Sodexo,

1 4795

how the find ct mf and mf roll in metering

1 2043

1 Sq.mm ( Aluminium Cable ) = How much Amphere ( AMP )

Google, TATA,

4 17388

if you asked to choose a ckt breaker from MCB & MCCB for 32A which one will be best and why??

7 6806

when we switch on the switch and load is not connected at home,is electricity wasted?

1 2535


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Un-Answered Questions { Electrical Engineering }

what parameters should we check to reduce the power bill

1825


If we have use two power cable for incomer, that time how many use cbct for earth leakage protection? 1 or 2 if 1 way? If 2 way?

1627


Is it possible to measure correct value of earth resistance & cable insulation ristance with out disconncting earth lead & both sides of cable ends? If not, any other method to measure ER & CIR with out disconneting from the system.

1636


what are the basic insulation levels & what its Unit

1477


In our plant we have installed new MCC with ELR and CBCT which is detecting some leakage current in the system but it leading to some confusion when to check that in which feeder which is drawing current we put off the whole panel itself but still CBCT detecting some leakage current so can anybody ans me , where i am going wrong or how to detect whether its actual leakage or CBCT malfunctioning.

1694






if we have a industrial load of 400 kilowatts with 415 volt AC then how much total harmonic distortion (thd%) should be acceptable for steady power system.

1563


IN induction motor pf is increased using capacitors.what will be the effect on motor and system when very large capacitor is accidently installed and pf goes leading.

1616


What are the types of class b amplifier?

592


In the formula : Knee point voltage = Burden X alf / class, Please inform what is alf? regards Shashidhar M.R.

3379


how to commissioning the genset with amf panel?

1882


Explain the method to keep noises low in a control system?

641


current transformer balance the power level on both sides. e.g in case of step up, at secondary side voltage rise but current decrease and vice versa in case of step down transformer. but how this power level remains same in case of current transformer and voltage transformer

1148


Can anyone explain me about the capacitor calculation

1693


How to do cable earhing? whether by grounding Armour to ground or by running extra G.I wire along with cable? which one is preferred mostly amoung them? If the second one is more preferable how many GI wires to be run along with cable (1 or 2)?

1576


What the formula for calculating no.of earthings & size of earth strip for 100mX90m shop.

1859