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Electrical Engineering Interview Questions

A 500 V shunt motor runs at its normal speed of 250rpm when the armature current is 200A. The resistance of the armature is 0.12 Ω. Calculate the speed when a resistance is inserted in the field reducing the shunt field to 80% of normal value and the armature current is 100A.

VECL,

1361

Can a generator rated 400 V, 60 Hz be used in a 50 Hz System? Yes or No ? Why ?

VECL,

940

What is meant by load angle of an alternator? Upon what factors does the load angle depend?

VECL,

2128

How do the synchronizing lamps indicate the correctness of phase sequence between existing and incoming alternators?

VECL,

1039

which of the following motors is non-self starting?

2554

We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure of PT is frequently happening and the rating of the PT is 0.2 class accuracy, with primary star and seconday (two cores) star connected. Some experts has suggested to not to connect the PT Primary neutral to the ground because when transformer neutal NCT connection is loose; the faulty current will flow through the PT primary neutral, resulting into failure of PT. My question is: Is it necessary to remove the primary neutral connection of the PT from ground? if not, what would be the reason for failure of PT. Please guide me.

1958

how a circuit breakers work at fault condition .plz give a specified answer.

1595

What is industrial plc

TCS,

878

i am getting to neutral earth voltage zero ,is this a perfect earthing ?

1928

How we can defined theecopper cable size if we know the aluminium cable size?

970

what is effect of length of air gap on performance of dc motor and generator?

DEI,

884

How much ph is maintained of water electrolyte which is used in LRS for 1200 kw slipring induction motor ?

817

how to select fuse rating for a 3-phase motor ???

957

why the power factor of the induction motor is low?

1246

why we don't use earthing as neutral?

2138

Un-Answered Questions { Electrical Engineering }

What is shunt voltage and u v voltage witch one best

902

What is the difference between a verilog task and verilog function?

237

what is the effect of un-synchronized power.

1129

What are the disadvantages of thermal power plant?

244

What is reactive power and where it is used.

807

we have two motors 1250kW,6.6kV to be coupled on the same shaft ,so please provide assistance for their synchronisation.

1229

How to calculate the sag of OPGW during stringing???

1713

What is difference between slip rings and carbon burushes?

12840

number of I/O devices in siemense plc

1251

what is DRP panels?

1205

What are the specifications for conducting earth leakage test as per IEC standard?

1013

Define relative stability.

232

Can we test the alignment of End shield and stator of turbogenerator without rotor insertion? Also how to fix maintain the alignment at site installation?

1250

explanation of mesh bus bars

1271

what is the cause of voltage dipp or swell in the transmission lines?

1221