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Electrical Engineering Interview Questions
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Why we use ups battery and dsdb battery in thermal power plant

MDeC,

1196

I had finished D.E.E.E at 2004,I wish to take C license.I am working pvt company HT supply but my professional certificate was missing.I have diploma & course completed certificate.without professinel may I got c license?.pls guide me.

OEG,

1 1908

difference between converter and invertor

 2 3288

Can I use star delta connected induction motor for dual supply voltage?

 1070

What is the physical significant of power factor?

Cooper,

963

what is the significant for using two types of voltage(line voltage & phase voltage)

NTPC,

1 2207

How to calculate the cross section area for a 350 m cable, motor power is 26 kw???

Orient,

1 3338

what happens when a dc shunt motor fed with an alternating suppy ?

 1 2664

What is the formula to calculate distribution transformer De-rating on iron losses basis

IESCO,

929

Dear All, Can anybody please tell me which value(saturated or unsaturated) of sub-transient reactance(Xd") we take for the calculation of fault current of the system?

 1 2624

Petroleum jelly is applied to the terminals of the lead acid battery is to prevent?

KSEB,

2 4995

In a Capacitor the electric charge is stored in:

TELK Transformers And Electricals Kerala Limited,

2 3151

Rated moter voltage and frequency is 380volt 60 hz but moter is running at 380votac 50hz is this harmful for moter winding

Infosys,

1 3995

what happen if the battery is charged by more than one source ,for ex: connecting data cable to laptop & charger pin to source supply ? 

 2 2837

When testing an earthing connection, we use a 60 or 100 candle bulb with a phase connected direct from supply and the other wire to the new earthing provided.If the bulb glows then the earth is ok.Else earth connection is not Ok. So, why dont we can use all the home appliances taking a single wire from the phase and the return connection to Earth instead of return connection to neutral?

 2 2749

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Un-Answered Questions { Electrical Engineering }

whats the differece between Exd and Exe

3770

What is relation between mu(nought) and epsilon(nought)?

195

what about GD square and its important for motor design?

2733

How we calculate DC inducation moter Amp? Sir pls give me formula......

968

how to carry out Magnetizing Current Test on Distribution transformer and what purpose we are doing this test. why transformer rating in always in KVA ? what ispositive, negative, zero sequence impedence? How ElCB tripping if Neutral touch with ground Why AC & DC capacitor are use in UPS ? why motor rating in KW? how to syncronize two dg sets

1218




what is v/f control in VFD?

563

3 shows a 415 V, 3-phase generator supplying a 3-phase 415/110 V transformer. Draw the individual and combined impedance diagrams to a base of 10 kVA. Determine the system fault kVA and the fault currents at the 415 V and 110 V busbars for short circuit faults on the transformer input or output terminals. Work in p.u. values of impedances.

1665

I have 1500/1A CT If i connect this CT in 6.6KV bus bar means what will be the voltage present in CT?

1008

Why star delta starter is preferred with induction motor?

167

How do we calculate transformer oil in liter from the rating of the transformer.

698

advantages and disadvantages of inverse definite minimum time RELAY

515

What is the automatic voltage regulator with servomotor?

1106

what is the function of bearing in dc mchine" and where it is placed

1644

what is the soft starter principle? how is connection diagram? what is the procedure for checking the connection?

1272

how much LT load can bear by the 100 KW HT connection.

1225

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