Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Does RCCB do the job of MCB? Lets take 16A RCCB. it trips when residual current exceeds 30mA. does it trip in an over current situation, i.e when current exceeds 16A ??

2 4485

In 3phase power= Root*3*v*i*cos@ What is the power in 2phase....??? and Derive it

Essar,

3 7148

What is the difference between KV,KVAR,KVA,KW?

L&T, PowerHouse, YUI,

6 48748




how to calculate voltage drop in long distance cable? for an e.g lamp of 12 volt ac ,300watt is 90 meter away from supply i.e (x'mer 230 v / 12v)and i m getting 8 volts at lamp terminal ....

1 2632

how you can select circuit breaker for 2000kva transformer?

TATA,

9 12683

What are the applications that use Solid State Drives in your home?

L&T,

1 3688

In between UPS out going changer over switch and ups raising main input, both side cable gland producing heat but the cable doesn't get heat,Why?

816

what is the function of generator exciter

NTPC,

11 54040




One of the advantages of HRC fuse links is that they can be used to back up equipment with an inadequate rupture rating. briefly discuss what this means

1 3720

What is meant by the KA-rating of a circuit breaker? In this regard, discuss the stresses experienced by the circuit breakers

3 10062

WHAT IS THE DIFFERENCE BETWEEN KW AND KVA ?

10 26000

In Battery Charger - What is the meaning of End Cell Voltage and Float Voltage.

Focus, PSEB, FLSmidth,

8 26219

How to Calculate the maximum Demand required for a connected load for a manufacturing Plant

6 64839

How to design harmonic filter at the project stage without nowing the harmonics levels

787

How to connect a Restricted earth fault relay for 2000KVA,11/0.433 KV Distribution Transformer and What is the neutral CT ratio should be selelcted for 2000 MVA Transformer for estabilishing the Restricted earth fault relay

1 2067


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Un-Answered Questions { Electrical Engineering }

What will be the current drawn by HT motor, if low voltage is applied.. any formula to calculate the LT amps of HT motor.?

172


If a 3 phase induction motor is in off condition in the conveyor and rotor of the motor keeps moving with the conveyor than the resistance of windings of motor varies. why is it so ??

702


In the N-series schneider reclosers. What is the difference between current during fault time and current at tripping? This appears in the Event log in an event of a trip out.

461


In a power conditoining unit (inverter) of a solar plant when we measure the d.c. current fed by different strings of solar plates to inverter, the current in the negative wire is less almost by 1 ampere to the current in its positive wire say current in positive wire 5 A , then current in negative wire of the same string is 4 A. Since the current entering should be equal to current leaving then why the current is noticably less in negative wire.

195


How Calculet The UPS AH In Load

215






What is dynamo?How it works and what is the function of dynamo in a DG.

724


What should be the magnetic balance test values for a 3 phase delta/star connected single primary dual secondary winding transformer (90 MVA / 2 X 45 MVA TRANSFORMER)

591


what is sevice settings for mccb?How can be it setted?

749


Draw torque - speed curve and load curve of induction motor? mark operating point ?

694


if the number of poles generated in stator and rotor side of an induction motor are different then what will happen and why?

534


What is touch potential and step potential?

808


how can i find ct ratio of meter by seeing name plate of meter and how it should be used in MF calculation if it shows only-/1???

478


in HT service 3ph 4 wire service Y-phase voltage shows zero . whether it is meter fault? or what be the reason ? if y-ph voltage zero ,can current is recorded? reasons for failure?

409


what is meant by the phrase 'static load' in case of shorting in a generator excitation system?

801


if we give 60 hz single phase supply to the transformer used in europe , than what will happen

709