Electrical Engineering Interview Questions

what is the burdon in case of relays?

2976

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

RRB,

6394

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

7370

why permanent magnet generator have higher frequency of 400hz

8732

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...?

6735

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.

1717

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

1736

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

3595

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?

2610

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

5934

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

1376

why lightining is not available in swith yards?

2802

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

8485

what is the speed of mixie?

8832

what are the causes for strip heater failure ?

2595

Un-Answered Questions { Electrical Engineering }

in dc shunt motor if field winding is shorted then

1373

define hysteresis loss, eddy current loss and windage loss

1540

what is the diference between the 4pole & 6pole DC Motors & what is advantage 6pole over the 4pole ?

1538

what are the accessories need to be added while doing estimation for the following: 1.MCCB 2.MCB 3.ACB

1584

What is the general power factor & min. power rating of TV,LCD type TV, CRt type TV, Scanner, printer?

1619

What is diversity factor in electric installations?

719

What is shunt voltage and u v voltage witch one best

1303

What is the Difference between Ac Drives and Dc Drives? According to application, speed, Torque, cost, Reliability, Construction, Motor etc... Thankyou !!!

1681

how many joint can done in HT line and what is life of the joint

1753

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

1454

We have 750KVA DG set, we want to introduce REF relay with 1250/1A,CL PS,Current transformers.The lead distance of 2.5mm copper flexible cable from CT to relay is around 5mtrs.We would like to know the knee point votage(VK) & IM calculion for CT's

1455

How many gap between finger contact in a.c.b. and v.cb.?

751

diff b/w normal grounding and resistance grounding

1418

In which of the following case, the rotating magnetic field is reversed? A regenerative breaking B plugging C dynamic breaking D forward motoring

1516