Electrical Engineering Interview Questions

The insulation resistance of a cable can be measured by

3936

Starting times for soft starter & power factor is thier any standard or datas available in manufactures list. Kindly suggest.

1406

What's the differs between voltage & current & emf.

CTS, NTPC, TCS,

3407

i want to measure voltage difference between neutral and earth so i just simply use voltmeter. my question is that may i use this measure continuosly.or there are some electricity board restrication on that? or it creat some problem on my measuring device..?

NEEC,

3372

What is differance between alternator and generator?

IOCL,

7059

How the unidirectional torque produced in dc motor

CGL, Sail,

8310

while doing high potential for 11KV 3 core cable how much leakage current will obtain?, what will be acceptance value?

2359

Why neutral is used in electrical system?

2489

what is the importance of neutral in elctrical system?

6780

How we can measure the thickness of bus bar for a given load ? any farmula Plz elaborate clearly.

6460

working of diesel generator ?

1288

Can clean earth cable be considered as low current cable

1488

how encoder works?

2615

why we don't use air circuit breaker on H T line in place of vacuum circuit breaker ?

5134

IT IS SAID THAT THE OLTC OPERATION SHOULD NOT BE PERFORMED WHEN THE TRANSFORMER IS GENERATION TRANSFOREMR/STEP UP MODE. WHY IS IT SO?

2917

Un-Answered Questions { Electrical Engineering }

why star point of HT motor not earthed?

1675

what is meant by directional earth fault and non directional earth fault? describe both.

1399

What are operating procudures & Safety precautions to be observed while operating OLTC in manual mode ?

1379

A 400 V, 50 Hz, Δ connected synchronous generator has a field reactance of 0.1 Ω and armature resistance of 0.015 Ω. At full load, the machine supplies 1200 A at 0.8 pf lagging. Under full-load conditions, the friction and windage losses are 40 KW and the core losses are 30 KW. What is the machine’s overall efficiency? Ignore any field circuit losses.

1253

1389

in indoor type circuit breakers why only the corner breaker trips specially during cold season. What is the reason.

1390

what is difference between speed mode and torque mode in motor?? explain in simple words please.

1080

what will be the maximum winding temperature of 6.6kv HT motor 450kw, Full load current 49A. 50Hz Frequency.

2673

why transformer ratings in kva? & DG ratings in kva? & Motor ratings in kw/HP?

1022

How can we measure the residual voltage in dc machines?

1155

What is the formula to calculate the rating of power cable for three phase current.

1599

What is the Good Earth resistance value of G.I & Cu. Chemical Earthing & Normal Pipe Earthing?

1797

what is parellel power factor correction?

3313

Can any body tell me the different types of LT cables & their application.

1564

what is integrated ac contact circuit

1576