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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

while buying 30 kva on line ups for 1 phase ouput, we ave to calculate the number of batteries for 2 hours back up? how to calculate the ah rating and number of batteries

1 2493

How we can design a cable for a 3phase load.

1 2224

can we run 3 phase induction motor under 2 phase supply

12 30339

What is Surge Capacitor? Why it is require in Generator Circuit Breaker,inspite of surge arrester?


in our all power plant have connected in grid and grid voltage and plant voltage is same, but as per as electrical concept the power will transmit from high potential to low potential but here altough same,then how power transmit from power plant to grid.


what is the difference b/w circuit breakers and relays?

3 4394

which one is more costly:single phase induction motor or 3 phase induction motor??give proper reasons..

1 2381

Due to ferranti effect which power increases at the receiving end?active power or reactive power?

5 6220

different between circuit breaker & switchgear & relays


6 33337

what is different between synchronous & asynchronous motors

3 4551

i have dry type transformers can you help me that how many tests i can do to know the performence of transformer and also please tell me about the BDV test and Insulation resistance test in oil cooled transformers


4 6012

Why transformer neutral is earthed


7 8995

why capacitor bank shorted by resistance ( 3 terminal )

1 1556

Why 3 over-current and 1 earth fault relay is used on primary side of transformer? Why 2 over-current and 1 earth fault relay in used on secondary side of transformer?


1 6335

hi, i have 3x200KVA and 2 x 80KVA UPS with battery bank of 150AH 68Nos. and 100AH 204Nos., i need to install AC either ductable or PAC type, so can you help me to calculate heat load and capacity of the AC to install.



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Un-Answered Questions { Electrical Engineering }

Why is a plain induction motor unsuitable for wide speed control?


Define active and passive network?


what about SAP/MRP regarding manufacturing of electric motors and all drives?


How is the gain affected by the introduction of feedback in a control system.


As you achieve greater success with the company after some years, Will you like to be a share holder in our company?


I am designing new project sub station with 220 kV / 11 kV, 40 MVA capacity. This project have many recifier sets, which can generate 3rd harmonics. Now I have to select vector group of This transformer. To minimise 3rd harmonics, what care should I take in selection of Transformer Vecrtor group? If it is Y-Y with open Delta tertiary then what should be the rating & voltage of Tertiary Winding?


What are the different methodes for calculating the short circuit Current?


Factory acceptance test. FAT. For 132 kv transmisstion towers what is that meaning and what are the tests commonly companies perform now days.


what is diff btw electric,magnetic & eletromagnetic field


What is Traction? 1KVA Alternator, How much urrent taken?


A powerplant has 8 gensets operating in grid parallel mode. In one genset sometimes there is pf variation and kvar variation. The plant operates in pf mode. When this variation is observed the load is stable, voltage is also stable, freq and genset speed is also stable. How will you check the functioning of pf card. What shall be the ideal output vdc of the pfc, from there it is input to AVR?


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


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


witch pump used in wtp


What is DC series motor?