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

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

Which starter can be used for 3 phase verriable speed (2 stator wdg) induction motor ?

2 4895

What is the principle of Excitation.

1 4244

why electron not flow in open loop,how they know path is open ?

3 5689

what is the operation of UPS ? can any one answer me?

7 9268

UPS battery Back time = no.of Batteries * Ah of the Battery / output KVA * 130 ? what is the 130 means ? can any one help? because all are using this formula how its came 130?

2 6005

why we need to us lenz's law for synchornous motor

Tata Elxsi,

2572

what happens when reactive power increases ? does the reactive power loss increase or decrease ?

2 6674

how can calculate 1kva generator running time in 1 liter keroscene

Kirloskar,

2614

In brushless excitation system how generator field current is measure even if the slip rings are absent?

Adani,

3 8988

In three phase energymeter the spindle rotating backward why?

1 3495

what is the use of neutral displacement relay

OCL,

1 28524

How can we check ELCB trip current sensitivity How can we check earth resistance value

2 17846

The DC current waveform is - . What about the fire alarm waveform?

1 3646

if a single phase 3 hp submersible pump of Crompton Greaves is moving in reverse direction and sometimes it moves in rigth direction ,then what may be the cause....

Crompton Greaves,

2 7910

What is meant by rating error prevention in breaker??

L&T,

1 4231

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Un-Answered Questions { Electrical Engineering }

Greeting to all members, How to calculate spill current when we have different ratio CT and Class for REF(Low Imp) I have 500/1A 5P20 @line side n 400/1A CL.X @ Neutral.

3002

How to calculate no of EARTH PIT? Describe the formula as per IS standard?

3841

What is main cause of cable's terminal point burned in Lug on high temperature although lug and cable selection is ok as per stantard and also tightness is ok as per situation. so please take in deep and tell correct answer thanku.

8289

how are reversing the direction of dc motor

1654

Why is better to have a minimum ceiling voltage of 250% than 160%?

1844

What is Phase margin?

1103

why sometime we get electrical shock while touching the ballon of dish tv connection ? which we should not get.

1986

Why we use duplex coil and hook switch in telephone system?

5041

how can we change the phase angle b/w two phase?

5177

HOW TO CHECK THE VECTOR GROUP OF A TRANSFORMER YD11?

3621

Why use the vcb at high transmission system ? Why can’t use acb?

1324

Terminal blocks is used for segregate the connections... There is any principle for terminal block..?

2125

What is the difference between single point and double point bonding. please kindly detail about bonding of cables.

2447

I have one ct of ratio 3000-2000/1 Amp its knee point voltage mentioned on name plate is 500-333/30mA-50mA at Vk/2. in secondary box there is three terminal named 1S1, 1S2, 1S3 then on which terminal obtained the knee point voltage ie 1S1-1S2 OR 1S1-1S3 & also specify the knee point voltage for the ratio 3000 from name plate.

2452

static chagre

2160

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