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Electrical Engineering Interview Questions

what is the burdon in case of relays?

2111

Why we use less dia. fuse and conductors at H.T. side, although we use higher dia. cables on L.t. side?

RRB,

4750

what is the formula to find Amp. for an 3 phase moter both if H.P. or if kW is known?

5652

why permanent magnet generator have higher frequency of 400hz

7527

a 650 KVA diesel generator is 1500 rpm, voltage is 415V n full load amps is 805 something,when are applied load more than 400 amps it's voltage is dropping, what is the reasons...?

5302

A TRANSFORMER 440/400V,DELTA/STAR CONNECTED.THE NEUTRAL CONNECTED WITH GROUND CABLE THAT IS DIRECTLY CONNECTED TO THE PANEL,FROM PANEL IT IS CONNECTED EARTH PIT.IS IT RIGHT? IF IT IS RIGHT LEAKAGE CURRENT AFFECTED.SECONDATY IS PROTECTED WITH EARTH LEAKAGE RELAY.

1236

what is difference between window type and wound type transformers?where we will use window type and wound type transformers?

1227

How can transformer oil be used in transformers with voltage rating above its breakdown voltage?

2760

why we still use sinusoidal waveforms for transmission and utilisation (we know generation is sinusoidal), instead of other ac waveforms such as triangle, sawtooth, square etc.,? is there any mathematical derivations to prove sinusoidal is efficient than others?

1980

how to calculate busbar capacity for 1000Kva transformer having22/.433V

4625

what is effect of 5amp fuse on 2mva pry protection of transformer

914

why lightining is not available in swith yards?

2064

How to test and satisfy the conditions of the vector group YNd1 for power transformer?

7674

what is the speed of mixie?

7057

what are the causes for strip heater failure ?

1728

Un-Answered Questions { Electrical Engineering }

What is the type of feedback used in an op- amp schmitt trigger?

188

What is the necessary condition for stability.

203

how to calculate the distance relay faulty zone?pls explain?

1149

What is the polarization index value ? (Pi value)and simple definition of polarization index ?

179

how the characterstics of control valve being done

1012

can we make a electric generator,which can not use any type of fuel,air,solar,gas,thermal,coal,petrol,etc and able to produce electrical energy (or self electricity generating generator)

1011

Pl.brief me any electrical major fault you have rectified.

1024

draw a circuit diagram connecting transformer OLTC- RTCC- VCB-Marshalling Box otherwise Explain in words

20038

why in an industry; machine having rated 200 h.p stopped after power factor is maintained above 0.97 lag by control panel in view-of energy saving

1044

What are the advantage of free wheeling diode in a full wave rectifier?

169

what are problems caused by the pdu in rack server

1015

What consists of 2 or more thermocouples to be connented series?

1054

what is formula to cal cute earth pit numbers and size of earth strip used in earthing?

1301

5.WHICH TYPE WELDING PROCESSES USES NON CONSUMABLE ELECTRODE.........

1209

i have gear oil pump with single phase motor.some time its motor starts running in reverse direction rather than forward direction...whats the reason behind this issue. 1- either capacitor is week? 2- or winding is week?

378