Electrical Engineering Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

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

BSF, TATA,

4 7800

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

MRF,

1 7696

number of I/O devices in siemense plc

EB,

2094

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?

Nissan,

2168

draw 3 phase rectifier diagram

Equate,

2154

draw single line diagram of UPS

Adani Ports, Equate, IBM, SAP Labs, Socomec, TATA,

1 17830

What are the causes of motor vibration?

Equate,

3 5577

WRITEDOWN FEW RELY CODES

Equate,

2230

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

2 5334

WHAT IS THE MEANING OF CYWY

1 6789

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

Intel,

1 5714

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

4252

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

5 22291

transformer phasor diagram under load explain it?

2131

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

1 3391

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Un-Answered Questions { Electrical Engineering }

I am designing new project sub station with 220 kV / 11 kV, 40 MVA capacity. This project have many recifier sets, which can generate 3rd harmonics. Now I have to select vector group of This transformer. To minimise 3rd harmonics, what care should I take in selection of Transformer Vecrtor group? If it is Y-Y with open Delta tertiary then what should be the rating & voltage of Tertiary Winding?

1837

direction of tarbine& genrator

2046

Describe the test procedure to determine the vector group

2082

How to synchoronize the generator (with gcb,GT) to grid????? ????? from Grid iam getting power (rated 400kv/20kv) through GT and its goes to UAT.,,ST.,, now my generator(rated 20kv ) ready.,, now iam closing my GCB.,, in GT iam suddenly giving 20kv on that Gt.,, what will happend

2026

what is quality factor in series resonance circuit and calculate the factor of voltage magnification? how it happens?

1920

what is doid

2770

Fantio of tranformer

2163

Vaccum circuit breaker

1328

how to decide no of electrodes for 1600A LT Main incomer panel

1606

What is the use for cable entry in control room?

1133

how to calculate the fault in substation

2367

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

1560

what are the effects when a salient pole alternator is run at high speed like 3000 r.p.m?

2388

What is the minimum distance to be maintained in between HT panel and LT panel and Instrument panel as per IEC and NEC standards?

1686

What is the difference between circuit breaker and isolator

1187

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