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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

On what principle reluctance motors work?

 1 3296

What is the difference between magnetic loading and electric loading of a machine?

 2 35438

How the size of electic machine vary with the sped? Between slow and fast running machines of equal ratings, which one is more economical to design?

 1 2791

what is the relation between frequency and inductive reactance in a d.c supply?

L&T,

2 5942

Why machines are avoided to work is saturation region of B- H curve?

 3 4476

Why different values of B’s (magnetic flux density) are chosen for DC machines and Induction Motors?

 1 2509

How the output,losses and temperature of machines varies with linear dimension?

 1 3980

Why air gap in rotating machines should be small?

 3 6538

Why rotating machines are not allowed to run near critical speed region?

 2 5576

From stability point of view,What(higher/lower) should be the value of inertia constant of rotating machines?

 1 3033

how to reduce humming noise in transformer?

3 8943

There are two nos of 33Kv/11Kv 5MVA transformers conecting through HT cable from substation having metering at substation itself.One transformer used at a time another remains stand by.Further 11 nos of 11Kv/440V transformers are attached on it and each transformer is having its own Power factor correction panel.Now one 33/11Kv transformer at no load condition/Stand by condition is having power factor in leading side upto 0.21 and while when another tranformer at same situation have power factor in lagging 0.42. Now one thing is clear that transformer one is having 1.5 Km long 33kv cable due to that PF goes in leading side and another is having only 250 mtr length remains him lagging. Now i want to know that how i can maintain the Power factor at no load/ stand by position though both are behaving in seperate manner.

 1 6039

Why oil preferred over the air as a cooling medium for high rated transformer?

 1 3627

What is emperical relation.Name few of them which are used in electriacl engineering?

 1 3368

In the ACB breaker capacity is 2000Amp but this each phase taken 1250 But total beldibg load is 600amp or 700amp watt is the problem

 1506

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Un-Answered Questions { Electrical Engineering }

How to calculate LT XLPE CABLE for 11 kv / 433 v , 1000 kva oil type transformer system?

1350

Define maximum demand?

653

how to find out 3 phase complex power in per unit in unbalanced system?

1577

What is the Load Capacity of Panther conductor (0.2) and dog conductor (0.2) 

2316

Thumb rule of cable size(rm>30 rm)X multiplying factor=ampere

1194




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?

1779

would the same effect be achieved by reversing the connection to one winding of the induction motor 3-phase?

1334

What are the internal and external faults?

617

1.what is the reason for transformer and lightning arrester blast in 33kv system

2577

i want to know how to determine that a surge arrester work properly in 11kv system. and how to test a 12kv surge arrester

1692

where was current transformer protection units used and why??

1544

how can you size an automatic voltage regulator?

1868

Hi Everyone ! My Name is Hakim ullah khan please i need formula of Cable Rating because i want to calculate by self without check any Table Chart... Thank you.....

1249

Define what is the function of anti-pumping in circuit breaker?

694

What is a difference between indoor transformer and outdoor transformer of same rating

5205

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