Electrical Engineering Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

Difference between online and offline UPS?

11 27066

How to calculate earth flat size for 250 Kva DG and transformer?

Deepak Fertilisers,

8 36391

can we use HPSV LAMP in HPMV LAMP fixture ?and viseversa.

OPS,

5 13733

Why motor initial starting current is high?

Pennar,

9 63485

megger generates D.C. voltage while earth tester generates A.C.voltage is it true? I know for megger it is D.C generator but what about earth tester?

IOCL,

4 25688

What is the cause for a blown fuse in one phase of primery side(HV) of a three phase transformer( 4169v-460v) in the time of closing its supply breaker. There is no load on the secondery side of the transformer in this moment.

Novachem,

3 13422

iam using DM 3251 voltmeter(1 percent accuracy)for 11KV system PT ratio is 11KV/110V.can anybody explain what is the max and min voltage deviation.

2255

What is mean by Sub Synchronous Resonance(SSR)???

1 4599

Will sag depends on the Specific Resistance of the conductor?if not Why??????????

BARC,

2 5511

how to calculate the neautral earthing conductor size for a 500kva dg set.

2 12276

What are the implications when the power factor is is leading condition ?

1 3280

What is double delta conection in AC Motor? And can we done the double RPM of the motor by double delta conection?

vguard,

1 12934

How to control speed of DC motor with AC power?

vguard,

7 13547

why transformer is giving some humming noise .....?

Electrotherm, JSW,

11 31461

when the rheostat kept in minimum to maximum position in motors what will happen?

7 18476

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Un-Answered Questions { Electrical Engineering }

What type of fittings and electrical accessories can be install in radiation area ?

1760

How to find ampere on ht side for selection of cable size ???

1801

what is calculation mathod/formaulla for deciding Size of busbar (Copper/ aluminum)for L.T. panel on Various Fault level like 50kA,25kA,10kA

2799

HOW TO CALCULATE THE HEAT AND LOAD OF LT-SUBSTATION WHICH CONTAINS 2*1MVA TRANSFORMERS,LT SWITCH BOARD,MLDB,ACB,BUSBAR,ETC...?

3947

what is the standard duration after failure EB power

1839

I have a relay contact rated at 220v dc which is supplied with a 24vdc from the panel,for it to trip the dampers(24vdc).What if the application of the relay changes so that it should work at its rated 220vdc then will it work at 24vdc supply given or any other consideration needs to be taken .....

2080

How to calculate the Efficiency of Chiller

3353

Why 11kv to be generated in generation station

1671

why -48 volts dc used in telecommucation

2653

Actually I have a doubt on neutral and earth.we use Ac power without taking neutral by connecting to earth,but at that time does it affects on efficiency of any electrical components or no? If yes how?

1402

Why PT voltages are measured with respect to ground? What do u mean by voltage or current polarized.

2380

what are the advantages disadvantages of connecting high voltage block( 1:1 transformers) transformers between the turbo generators and busbars.

2103

What is power factor why we should maintain the power factor unless what will happen

1915

How to calculate pitch, gauge of winding wire, and No. of turns for 30HP, 3 phase, 4 poles 50Hz, 380V induction motors

1945

how slip power recovery system work

3027

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