Electrical Engineering Interview Questions
Questions Answers Views Company eMail

if two transformers are placed parallel & both have fault impedance of 50KA will it increase or decrease show example?

676

How many points does a Circuit can have?

707

if two transformers are parallel & both have fault short ckt. impedance of 50KA in each case will it increase or decrease show example?

1 1577




How many points can we have in AC Circuit? Show by giving suitable example?

3 2492

-----------means a source which can supply a constant voltage to aload irrespective of the valu of load resistance.

2 2231

will there be any problem by recovering slip from single phase induction motors?

652

What is the electrical difference between Earthing Switch (ES) and Maintenance Earthing Switch (MES)?

1 1095

how we calculate the knee point of a protection and metering CT and what is the testing procedure.

CS,

1 2179




HOW WE KNOW IN PHYSICALLY THE CONTACT SURFACE OF A VACUUM INTERRUPTER IS GOOD OR GOING TO DAMAGE IN A VCB AFTER ABOVE 500 TIMES OPERATED.

Areva,

787

What is a LBB protection and why it is used?

Gridco,

2 5962

what is a starter ??

NPTC,

2 2527

what main difference betwenn invetter & ups & major difference

ABB,

2 4307

Dear sir, I am working in wind mill division , pls explain Pls explain in details with formula My question is Wind speed 3.5 M/s Gen RPM is 1500 ( 25 K/w Production ) Wind speed 12 M/s Gen RPM is 1500 ( 220 K/w Production ) Why in 3.5 m/s generation was low , why in 12 m/s generation was high , Pls dont explain wind force or wind density , that one already i know For the above question RPM was same why the KW was different Answer : 1. Its depends on the density ( Force ) of the air Sir , Pls explain wit Formula sir

Vestas,

1 1719

why stay insulator is not used with stay wire for 11kv Lines. Whereas it is used for LT lines ?

Essar,

2 9780

Why are cables rated for 40 KA for 0.25 Sec fault current rating?

689


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Un-Answered Questions { Electrical Engineering }

what is photo voltic cell,& what are the materials associated with that?and any spcifications like volts/cm etc?

783


What is the requirement of grounding the neutral of single phase generators on load? If the neutral is not grounded, what will be the effect?

861


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

740


The 3 phase Delta connection RB=440V, BY=350V,.......* is Line to Line voltage RY= ? And Formula....?

153


how to calculate the tarriff for an industry whose kva demand is 10 mva

737






How to select circuit breakers rating eg. if i select a circuit breakers of capacity 40 amps DC with operating voltage 28 volts and if i what to use same circuit breakers for 300 Volts DC application what is the current rating of this circuit breakers.

633


Why frame of the motor is specified?. If we mention KW and voltage level,automatically frame is decided or separately frame is compulsory to mention?.

505


why dc is used in control circuits for MV & LV switchgeras instead of ac

513


What are the special cables required for explosion proof wiring?

9265


salam&hi, i need to know about how can i calculate an enough current for the new building before i submit it to the suppliers

668


How to prepare electrical preventive maintenance plan & shedule of machine tools in manufacturing unit.

974


PLZ EXPLAIN THE INTERLOCKING AND CONTROLLING OF CONTACTORS????HOW CAN I DO THAT?

3352


wHAT IS CAPACITANCE LATCHING? hOW TO CALCULATE CAPACITANCE LATCHING? hOW TO SOLVE THE PROBLEM IF CAPACITANCE LATCHING APPLIED?

755


does buccholz in a transformer use batteries

2202


please send me the L&T Emb. sys. placement papers and entire details of pattren

1011