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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

how do we calculate contactor and fuse rating for a motor if its full load current is known,i want exact calculation for 1.5 kw motor????

Allied Group, Nucon,

1 4869

what is the difference between 2 way and 4 pole selector switch???

Allied Group,


how to calculate 'In'in a system?

2 2876

what are the importance of earthing?list different types of earthing.

1 4230

Why only 1 CVT in Y-phase is used for synchronization in 3 phase power system?


1 4645

What is the causes Power Factor become leading and what is the effect of Electrical system ?

2 3259

It is a three inch fan and i want it to rotate to other direction .I've tried cutting the wire and reconnecting them inverse like black to white and white to black ,but it won't start rotating when i plug it in that way.And then it works again when i rejoin the wire to the way it is. I don't know what causing the problem.Is there anyone familiar with these small mortor?Any suggestion would be appreciated.Thanks!!

2 2483

what is the pressure in side transformer under normal condition?

1 2611

What is SFU ?

4 5591

What is the difference between line Distance protection and Line Earth Fault Protection?

1 2948

how will you find out the fuse failure by remote operation?

1 2757

what is the purpose of using semiconductors in HT cables


3 20105

What is the fullform of IPS in substaion using Aluminium Tubes


14 47972

Pl. brief about break-down maintenance of machine tool.


How to Prepare preventive maintenance shedule of machine tool.



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Un-Answered Questions { Electrical Engineering }

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


For overhead protection we use which transformer?


I have 2 KW electric water heater.I am gonna use it in controlling water I needed to increase or decrease the heating there any electrical-electronic circuit for varying the resistance & so current?


What are the advantages of stationary armature and rotating field system?


What is pole of the system?


What do you mean by screen of power cables?


What happens if we give the supply to the rotor of induction motor and make its terminal shorted?


What type of fittings and electrical accessories can be install in radiation area ?


does a DG set has low fault level as compared to that of a transformer.If yes then why.


formula for calculation of switchgears(i.e. contactor, fuse, cb, relay etc.), if load current is given?


What will be the effect of circulating current in HT xlpe cable when both the armour ends are grounded. Will the termination fils after some time in case of 33 kv supply.


we are small scale industry in production of rice & rice bran. Pls let me know how to take contract demand for our industry.. (for information we have total 600.hp)


What should be the amps for a MV fuses for transformer 630kVA 20(10)/0.4 kV


7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?


How to select transmission line type (i.e. 11kv or 33kv) for new established industries