Electrical Engineering Interview Questions
Questions Answers Views Company eMail

how to calculate size of cable from motor current given and how to calculate full load current of a induction motor.

Aarti Steels,

3 4708

what is the purpose of commutator in DC motor?

3 4453

Is it possible to implement Restricted Earth Fault protection for a transformer without neutral CT?

2 3326

What is earth fault?

3 4826

What is the function of Governor in Hydro Power Station? What is the Function of Lightning Arrestor Voltage Transformer (LAVT)?

2331

Why the transformers are rating in KVA.?

ISMT,

5 6503

for star delta connection,,why the contactor star not burn,when red,yellow and blue cable is looping.

Mahindra Water Utilities,

2 9374

1) Why distributiion system decided 11 kv, 33 kv, 66 kv, 132 kv, 220 kv, 400 kv, 2) In 3 Phase line terminal of capacitor, why used for power factor improvement. 3) Why used rating KVA in transformer?

1 3737

what is negative and zero impedance in 3 phase induction motor ??

1452

Why the magneti fields are not passes from southpole to north pole

SGML,

1623

formula for calculation of switchgears(i.e. contactor, fuse, cb, relay etc.), if load current is given?

1617

what is mean Boost voltage and what is working principle of Tube light

Trimax,

2 3459

what is timing for mccb 800A tripping?

L&T,

1 4732

What is different between hypo test and megger test

ABB,

2 10634

how much leakage current is allowed in MC61A L&T make relay?

Siemens,

3105


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Un-Answered Questions { Electrical Engineering }

What is transformation ratio what it describes?

1146


what are the problems that generally occur in power flows??

2512


What is meant by coupling capacitor?

626


What is the meaning of floating point earthing in battery backed systems ?

1451


What is depreciation factor?

1744






what is the need to express current and voltage in rms value? rms value is also called as effective value,what is effective value?

1457


In case of salient pole alternator when number of poles are 4 or more than 4 it helps the flux wave to be sinusoid as air gap length is increased from center to tip , but if the number of poles are 2 how does the flux wave is sinusoidal?

1505


what is the difference between Power and Distribution transformers ?

1609


what is earthing transformer? draw the winding dia.of earthing transformer.

1214


How can we find the breaking capacity of a Load breaker switch (LBS) fed from 11 kv supply??ex:50KA, 26kA etc???detailed step vice answer pls.

1564


How can we calculate the motor frame sizes?

2890


Why 30kw 40 hp 4 pole 3ph induction motor over heated?any steps on reduction in heat?

1230


How PSV sizing being done

1792


I'm generating a pulse of 3V with frequency 80Hz (12.5ms time period) and pulse duration 0.125ms and feeding it to a transformer since i want the pulse to get amplified around 60V. At the output amplification s happening but the pulse is changed to a spike, can you tell me what could be the reason? (an ordinary transformer 220V-12V stepdown transformer is reverse connected ie. now it is 12V-220V stepup and voltage amplification happens)

1429


why genarator genarating voltage 11 KV?

1272