Electrical Engineering Interview Questions
Questions Answers Views Company eMail

ELCP USE IN 3 PHASE SUBMERSIBLE PUMP? THEN USE 3 POLE 0R 4 POLE?

4 6102

what is the difference between surge protection capacitor and surge arrestor

NCS, NCS Sugars,

1775

What is the diffrence between ofline ups and online ups?

Intel,

3 5718

What is the purpose of RECTIFIER ASSEMBLY in AC power generators?

2 6006

Why we cant store an ac power. If we coo store in which device we can?

Jindal,

1604

I am looking for LV CT test. To check the polarity of the CT only. Can you suggest any supplier. Different companies are offering CT/PT Tester which is expensive. Thanks

2 4178

WHAT DO YOU MEAN THE DIFFERENT TYPE OF CURVES OF RELAY LIKE STANDARD INVERSE, VARY INVERSE, NORMAL INVERSE, LONG INVERSE ETC....

1496

difference between a diode and thyristor?

1739

What is the difference between single core 2 wire and single core 3 wire system? Which application we are using this? and for What purpose we are using this?

1813

1.what is meaning of curve into a mcb. 2.what is basic reason changing of curve

1506

What is load shedding?

1 3877

What do you mean by eddy current loss?

1 3790

What are the causes of eddy current losses?

Schneider,

1 3910

when i am going to take trail on a 3ph sq.i/m motor 5.5kw, i observed that RPM of the motor is very low as compared to the rated RPM and also it rotates in clockwise in first ON command,and anticlock wise in second ON command. finally i observed that on phase is no available . but iam not clear about, why the motor is rotates in both directions without any phase interchanging.pls answer to my question.

1 4535

Our Alternator nameplate specifies a power factor of 0.8. When the Alternator is on light load, the bus bar voltage rises to 11240 volts, whereas the standard value is 10500 volts. Is it ok to increase the power factor to 0.85 or 0.9. I am afraid because the power factor on the name plate is only 0.8 ?

Escube,

3 5223


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Un-Answered Questions { Electrical Engineering }

If Dg set load increase 25%, How much increase fuel Consumption (15 kva 2 cylinder DG set)

1791


What are the types of class b amplifier?

572


What is the Diff. btw Manule Pull Station & Manule Abort Station Switches used in FM200 System??

1345


i want to learn control schedule for 11kv panel? can any one send the detailed control schedule?

1872


what is formula for zero phase sequence of nuetal earthing transformer of 6.6 kv

1647






Can clean earth cable be considered as low current cable

1515


how to find the torque of the single phase synchronous motor by doing an experiment

1481


When are the directional relays used?

575


what is the reason for indication of light in the earth lamps of main switchboard.if there is an earth why does one lamp get dim and the other two bright.

1820


what is the breaking capacity and making capacity of circuit breaker and how

1547


why the starting voltage drop in a cable needs to be limited?what is percentage of the voltage drop allowed during starting?

1333


How to find out damper winding failure for synchronous machine?

958


If I want to connect a capacitor bank on the HT side of a 11kV/415V, 3 phase delta-star distribution transformer to supply Reactive power to it..what practical specifications of a Capacitor bank that can i've??please reply..

1992


We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?

1629


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

1681