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Electrical Engineering Interview Questions
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what is the difference between Ith & Iu rating in MCCB. Particularly on SACE ABB Circuit Breaker?

Siemens,

2 16258

I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?

Siemens,

1764

How to calculate transformer capacity requirement for a project site?

ABB,

5 22533

Difference Between B Curve & C Curve in MCB.

 3 62840

What is the difference between sensitive earth fault and restricted earth fault in power transformers?

 4 50367

which INDIAN STANDERD in Mention the earth test value?

 1 3456

what is the use of piston rings in the engine used for a generator...........

 1678

what happen if drive input fail momentry at 48.5 HZ frequency?

 1496

what is the reason for drop in freq. from 50 hz at generating side to 49.8 ,49.6 etc.at receiving side???

 2 3678

how the rotating magnetic fieldis produced in induction machines??? give the correct explanation.is there any mathematical expression for the same?

 1 2341

what is use of capacitor in fan

ABB,

8 21614

what is the meaning of DSL

Airtel,

4 10857

what do you mean by puncturing of insulator by ice -coating?

2 3507

If DC supply is given to a transformer it may a) Work b)Not Work c)Give lower voltage than the rated voltage on secondary side. d)burn the winding

wbsedcl,

12 13148

HOW TO CALCULATE AMPs OF CURRENT TRANSFORMER IN HT Panel

MAB,

1790

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Un-Answered Questions { Electrical Engineering }

how indusrial diesel generator work

1447

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

1495

Can we use a absolute encoder to show rpm of a motor ? what about the condition when power is off ? what is difference if a incremental one is used ?abanirout@gmail.com

1572

What is the approximate value of stacking factor?

679

If 22 KV HT line, Current transformer is 25/5 then how to calculate multiplying factor.

592




what is formula for calculate thermal overload in new numiricalrelay( not in bimetal relay)?

1775

Parts of machine and their discription in details with suitable photo

1621

What are the applications of autotransformers?

626

is it possible to say motor horsepower number without seeing name plate(when name plate damaged)

1574

State nyquist stability criterion.

628

WE HAVE THE DC RECTIFIER 1500A, INPUT VOLTAGE IS 3 PHASE. HOW TO CALICULATE THE LOAD? 3 PHASE SIDE EITHER dC SIDE. PLEASE SUGGEST ME

1394

why tertiary winding is used in transformer with diagram?

1772

how we design a pannel to start 10HP motor with the help of star delta starter?

1728

Which power will flow first if we switch on a motor Active or Reactive? How?

4337

What is CCT (Correlated Color Temperature) ?

1491

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