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Electrical Engineering Interview Questions

Why grables are put in substation?

2825

Explain the advantages of the wheatstone bridge method of measuring resistance?

48125

In what way does the variable ratio-arm improve the usefulness of the wheatstone bridge?

4597

Explain why inductance of the iron cored coil changes with current?

5001

Derive the inductance of a coil in terms of its physical factors.

3354

Let me know that how i calculate the alternator sub tranciant reactance and tranciant reactance.

1670

assume we are put both df/dt and vector surge relay in same bus the df/dt relay setting is +5 hz an -5HZ. we want operat the vector surge relay before the df/dt how i calculate the setting of the vector surge relay.

5153

1.what is the contact resistace of CB ? 2.radioactivity should be mesured with---------?

4638

Why is making current of CB always greater than CB breaking burrent?.

22962

what r PID controllers?why they r used?what is there purpose?plz Explain in detail

1189

what is mean by PIR in circuitbreaker and give me detail of that?

2711

what is STUB protection in tranmission system and switch yard area?

65715

how does the power is travelled in conductor

3067

Is there any specialised book to refer about fault level calculation both in MV and LV side??

1222

electrical machines

14703

Un-Answered Questions { Electrical Engineering }

what is LSR?

1092

what is the formula of starting current of 3phase and 1 phase motor???

1192

It is desired to flood light the front of a building 42 meters wide and 16 meters hig.Projectors of 30 degree beam spread and 1000 watt lamps giving 20 lumen/watt are availabl.If the desired level of illumination is 75 lumen/m and show a suitable scheme.Assume the cofficient of utilization, deprecitation factor and waste light factor are 0.4, 13 and 1.2 respectively.

1400

nwhat are the main Components of servo motor?

1204

what is the terminal voltage of dc series generator running at rated speed at no load?

5233

critically criticize the application of ring main unit in power system

493

How they LT panel busbar size choose

878

hi guys please tell me the procedure for mesuring the coil resistance of 3ph induction motor?

978

when ID fan will immediately stop through VFD what exactly cause and problem the ID fan

565

How do you select the pickup value of the relay?

300

1.What will be stored in online ups EPROM IC?

1215

1447

According to underground cables a) stress b/w sheath & conductor is high b) inrush of core & conductor

1130

No load tap changing transformer working

828

What is step signal?

231