Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Difference between online and offline UPS?

11 19155

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

Deepak Fertilisers,

8 24369

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

OPS,

5 9094




Why motor initial starting current is high?

Pennar,

9 47845

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 17666

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 7675

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.

870

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

1 2487




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

BARC,

2 2521

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

2 6464

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

1 1445

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

vguard,

1 5794

How to control speed of DC motor with AC power?

vguard,

7 8300

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

JSW, Electrotherm,

11 19294

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

7 11257


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Un-Answered Questions { Electrical Engineering }

Cables Construction hi friends, 0.6/1/1.2 kV LV , DC and Control cables are concentric copper conductor what does its means and what is the use of concentric copper conductor,and are this with copper tape shield or copper screening, ? thanks

490


Which level of the Transformer oil got dielectric strengh? And why?

845


WHY IS THE EARTH FAULT CURRENT ALWAYS LESS THAN THE NORMAL CURRENT??

956


How we calculate the size of ht cable for any transformer

816


what is the calculation formula for motor starting torque,running torque, running torque.

266






what is the transformer rush current?

725


If a surge divertor is required to be protected by 32 amp C Curve Circuit breaker does this limit the amount of protection from surges that you will acheive

588


How to calculate total harmonic distortion level(THD) in VFD? and how can we reduce harmonics?

2621


what is servo motor and how it works?

999


What is transister define the transister ammiter ,base, colector.

886


there is an alternator 480 k.w, 400v,50hz, 4-wire running on load having leakage alternator body earthed current 38 A. is it within acceptable limit? if yes then give reference if no then how to bring within specified limit

726


what is the efficiency of thyristor

311


How to know the following data of synchronous generator 1. D-Axis Unsaturated Reactance 2. D-Axis Unsaturated Transient Reactance 3. D-Axis Unsaturated Sub - Transient Reactance

687


How can we calculate strength of copper hich is supplying electric power to heater and in it hold the heater also and what r all types of forces which is acting on it...

745


In case of generator when we consume more power produces by it why load on generator increase and starts sound more. and how it is adjusted..

614