Electrical Engineering Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

How it can worked plc based electrical system And which type of software using.

ITC Infotech,

2119

HOW TO SIZE THE TRANSFORMER OR WHAT ARE THE STEPS INVOLVED IN FINDING THE SIZE OF THE TRANSFORMER FOR GIVEN LOAD SAY 2000KW ?

1 3629

what happen when power factor of 2 parallely operated transformer become equle?

Flextronics,

2210

how to calculate short ckt current of trafo. ex.3-ph 3MVA trfo. 11/440, impdence voltage=7.25%

1 3883

what the good value of earth resistance test

3 5975

If two transformers same rating(11KV / 440V)connected in the same primary line(11KV), can we connect(bus coupler) secondary side directly or need a synchronization????

3 11911

Why we use RYB phase sequence?

3 8023

what is the maximum rating(KVA) of transformer can be used in distribution side..(11KV/440v) and why??

Jindal,

1 4531

In a running D.G set engine and Alternator is revolving at 1500RPM but no output in the terminal>>>>what to do?? someone told excitation problem ....please advice

3 5826

If the Power Factor of generator is 0.85...What does this mean and Can the motors connected to this generator operate at PF more than 0.85 ?

1 4312

How can we calculate the efficiency of a Running (On-Load) Motor ? What parameters are required and what is the method ?

1987

How to select earthing strip for 100kw induction motor ?

2 3612

conditions for parallel operation of dc generators

4 13528

How can we calculate ac current from the given DC current when AC voltage is given?

1954

why induction motor having low power factor at starting time and high at full load.

BARC, HPB,

6 40726

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Un-Answered Questions { Electrical Engineering }

Currently what is the highest capacity (MVA) of SPPg generator available in the market?

1818

Why efficiency of generator is higher than motor at a particular load?

2080

My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I - is the value of AC fault current. t - is the operating time of disconnecting device in seconds. K – is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.

1887

How to calculate the volumetric capacity of a oxygen & Nitrogen gas Cylinder if pressure is 145 kg/cm2 & water capacity of cylinder is 67 liters.

2190

what is reactive power?, why its measured in VA ? is it transient behavior of system?

2303

what is the stear deltaprinceple?

1886

star delta starter contorl circuit... drawing..

2096

What is the role of feedback in a closed loop control system?

1085

What is the general power consumption rating of CPU CRT type and Flat type, Monitor,Printer, projector, Scanner?

1902

Why insulation level follows this order? transformer < bus bar < circuit breaker & Isolator < transmission line.

2145

HOW TO CALCULATE THE HEAT AND LOAD OF LT-SUBSTATION WHICH CONTAINS 2*1MVA TRANSFORMERS,LT-SWITCH BOARD,MLDB,ACB,BUSBAR,ETC,......?

2102

HOW TO CALCULATE HV CABLE SIZING?

3224

In motors how many types of cooling systems were used?

2075

How to confirm the Phase shifting Transformer VECTOR GROUP relation , as below ZNy11.45d10.45-ZNYy0.15d11.15

3267

sir, 3phase induction motor takes different pf and different KW in three phase while running,explain reason

1481

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