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Electrical Engineering Interview Questions

How do you change an AC motor to DC? why there is only 50 Hz frequency in india & not other?

BSF, TATA,

4757

What is the formula to find out cross sectional area of cable for certain current rating?

MRF,

6226

number of I/O devices in siemense plc

EB,

1166

In electrical what is earth(ground)connection, wht is the importance of it, why it is recomended to maitain below 3VAC between Neutral and earthspecially in PLC used machines?

1318

draw 3 phase rectifier diagram

1143

draw single line diagram of UPS

15939

What are the causes of motor vibration?

3382

WRITEDOWN FEW RELY CODES

1280

how to calculate power factor of capacitor? what is transformer rating?

3274

WHAT IS THE MEANING OF CYWY

5173

How can we calculate C10 rating of a bttery from c5 or c20 ratings??

3871

diameter of cable and core is doubled then the value of capacitance is

2737

why core losses and copper losses does not depend on power factor?

17147

transformer phasor diagram under load explain it?

1178

how wud i know that whether i have to use unitized package substation or transformer?

2137

Un-Answered Questions { Electrical Engineering }

What happens to voltage when current through the inductor is constant?

168

Q) Write VBscript code along with QTPscript code in QTP tool for below scenario 1. Launch yahoo site(i know) 2. Do loogin(i know) 3.Click inbox link(i know) 4.Go to every page of mail box and count no.of read mails and no.of unread mails(i know) 5.Store page numbers, read mail count and unread mail count in a new excel file sheet 6.Create 10 types of graphs on that data 7.Do logout and close site(i know) 8.Save new excel files with graph

1548

Two bulbs of 100w and 40w respectively connected in series across a 230v supply which bulb will glow bright and why?

161

The SFC of an engine is 0.25 kg/kW hr. when the fuel used has a calorific value of 36000 kJ/kg. the thermal efficiency of the engine is

190

How can we calculate the KVA rating of a Distribution transformer from its core details?

1111

How out of step protection relay works?

1239

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

905

Brushes are placed at magnetically neutral axis,when brushes reach that point,the armature conductor gets shorted,but it can be seen that the dc supply is also shorted,wont that get damage? help me plz

1302

why use phase displacement in transformer.and effect of phase displacement on transformer

1852

151

I want to know how to calculate the size of electricity cable in building?

1089

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

1004

Can any body tell gulf interview question for experienced electrical engineer ?

1059

what is the difference between oil surge relay and buchholz relay.

5773

IN dc capacitive reactance is??

454