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Electrical Engineering Interview Questions
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how to find 5 kilo meter long under ground 33 kv cable fault location if IR VALUE shows 0.05 M ohm @5000 volt.and cable fault locator shows some time fault distance 3 kilo meter ,3.7 kilo meter and some time 1 kilo meter? now how to find the fault location that where is leakage. note--it is tested with 5000 kv megger and insulation resistance is 0.05 M ohm. and some time 0.03 M ohm comes.

OPS,

1512

what are the different sizes of U.G. cable & where these cabl;es are used according to voltage ..

HPCL,

1484

WHICH SIZE A.B.CABLE IS USED FOR 11KV.

Novel Tech Park, Power Grid,

1535

Can anyone send details regarding motor protection relays ? their manuals please ?

1 2085

How is a capacitor bank is designed ?

Asian Paints,

2 8125

We have a couple of oil tanks at our plant. One of them does not have a lightning arrester installed. My question is it necessary to install an arrestor on every tank or will this particular one be covered by the arrestor installed on the ajdacent tank, Since all the tanks are close to each other. Basically, I want to know that if these arrestors or protection works in a parituclar area of effect or influence. Thanks

1404

HOW DOES THE PERCENTAGE DIFFERENTIAL PROTECTION WORK IN POWER TRANSFORMER

1 5201

Can the output voltage of a rectifier be greater than the input AC voltage without the use of any voltage multiplier in the circuit??please provide the explanation too..

IOCL,

1439

what is meant by oil filled power & distrubution transformer ? if anybody know the link of detail about above transformers means plz send it i have interview on this week ? plz help me

3 3740

WHAT IS RMU & HOW IT WORK,IT USEFUL FOR HT OT LT POWER DISTRIBUTION MAUFACTUERE IN INDIA.

2 10328

22kV HT incoming should be 3 phase or 4 phase? why is it not 4 phase?

1 3249

A 200W,230V lamp is connected across 115V supply.The lamp will draw power?

SJVN, TCS,

6 27429

how we can set the IDMT relay.

Suzlon,

1504

for high freq ac,why we first convert AC to DC and then DC to high freq.AC

1354

with the help of drive can we run the 50hz motor on 100hz,what will be its effect.

BPL,

3 7338


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Un-Answered Questions { Electrical Engineering }

A motor running with lenze frequiency inverter stops if I REDUCE SPEED with 25% load.If I run it in High speed and medium speed running smoothly with full load.please help me to solve it.

1260


Where is servomechanism used?

478


why three phase capacitor takes unbalanced current in capacitor bank?

847


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

1332


what are the main faults that occur in stabilizers? How they corrected and resolved ? Types of stabilizers ?

1424






why we use circuit breakers for switching instead of normal switching device?

1255


derive DC RMS value for half wave rectifier?

2551


explain PV modules in solar energy generation.

1254


Define the term Capacitance and Inductance?

491


What is the function of electron gun used in crt?

457


why magnetising curve not start with zero voltage?

1666


1.why we are using metal oxide gapless block in lightning arrester,2.What is minimum and maximum rating of metal oxide blocks using in india

1361


We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?

1452


what is gas turbine intercooling ?

1374


What descriptive information does the NEC require to be marked on all conductors?

1283