Electrical Engineering Interview Questions
Questions Answers Views Company eMail

why do motors burn out? I understand why adding parallel loads to a power source means more current moves through the circuit, and can destroy circuit elements by overheating. What about when you have a vaccuum cleaner intake flush against a floor, a room fan sitting directly against a wall, or a power drill trying to drill through something too hard?

307

WHAT IS THE DIFFERENCE BETWEEN NUTREL AND EARTHING

Areva,

10 5369

For 300 MW plant what is the distribution voltage

6 4160

in alternator what is use of AVR ? how AVR is operating either AC or DC?

1 2544

in alternator how we can give power to rotor ? its power is AC or DC ?

5 2011

how can u determine size of the conductor by knowing the voltage level

2 2333

why HV test for cables?.why 0.7times?

Bosch, Prince Food Products,

458

What will be the output of t/f supplied with DC sourse?

2 1466

what is IP55,IP65

2 5652

what do u mean by starting torque? how it should be for a good motor? what is the relation between starting torque and power factor? What is the relation between efficiency and starting torque?

2 1452

please explain me about traction application?

2 2623

define differential current and restraining current in relays. how to calculate it by mathematically? post the formulaes.

Siemens, VPEC,

4 17685

why the rating of a transformer in kva not in kw.

9 3507

why cu losses called cu losses.

5 2927

What is the value of nuetral current in star connected load when DC is supplied to it???

1 1280


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Un-Answered Questions { Electrical Engineering }

can you any one give exact mathematical relation between AC current and DC current?

283


Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.

353


can we synchronize star system generators with delta system transmission line ? and how ?

1149


(1)WHAT HAPPENS WHEN SUDDENLY LOAD GIVEN TO THE INDUCTION MOTOR ? (2)CAN WE MAKE WOOD AS MAGNET ? (3)WHAT IS THE VALUE OF MAGNETIC FLUX DENSITY IN TRANSFORMER ? (4)WHY WE ARE USING ELECTROMAGNETI NOT ELECTROSTATIC IN MACHINE ?

491


define displacement & magnitude ?

357


In motors how many types of cooling systems were used?

505


what are doing the duall connetion in tree phase 10hp or etc motor with circuit diagram

338


How i can calculate current of cable according to ares?

247


at what basis/standard we have to arrive the current density of aluminium/ copper in busbar?

460


what is the function of choke in the flourcent tube lights and why the colour is in white mostly in flourcent tube lights

390


1500Ah VRLA battery,if its weight is designed 125kg during maufacturing its weight is reduced to 85kgs,What will be impact on AH capacity,life & economy?

511


What happen when neutral point connected to core balance current transformer? (Neutral point of an alternator of a 180KVA DG. Neutral point connected to CBCT means enter to the CBCT)

514


which network topology offers the greatest level of tolerance?

420


'documenˁ

364


How to setting the volume of RTCC panel AVR (11kv) controller

84