Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what is rated current and operating current?

1 4110

how u select control transformer for a mccb panels or any panels?for expample we hav 440 volts maim supply and control volts is 230v?

1639

How to run 1ph motor(230 VOLTS its full load amps is 4.5 ampa))with 480 volts main(we didn hav neutral)Thn we go for step down transformer.Our load 10 amps,so we conisder this amps in primary are secondary side?

1 2800

140 is load amps for a equipments and what ratio of CT requied for installimg ammeter to amps montering purpose?

1 3378

what difference between thermal and bi-metal over load relay?

2 7653

How we calculate the spacing between the conductors in 11,33KV lines?

NHPC,

3 12496

If mutual flux is 1.2wb & power factor is 0.8 lag , then what is the Useful flux of a transformer?

Nalco, NTPC,

3924

how we sesign the transformer give some specifion regarding design of transformers

1445

To test Transformer we give HT side 440V to see wheather that it is producing 17.6V on LT to verify Voltage ratio is correct or not but when we give the 440V voltage to LT side then what will happen to HT voltage ?

Aditya Birla,

3 6654

I WANT BHEL PREVIOUS QUESTION

Bhel,

1794

How to calculate load taken by a cable?

3 4881

how to calculate current and voltage in a same circuit?

1647

in 33KV or 66KV system which connection is aviable on high voltage transformer primary delta or star ?

3 5060

What is VFD, and how its work

5 7170

What different between kw and kva. why maser AC in kva.

3 4374


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Un-Answered Questions { Electrical Engineering }

What is the working principle of MIG welding? and its out put Voltage?

2701


How to test lightning Arrester?

372


Explain what is use of lockout relay in ht voltage?

647


how many electricity poles are there and what are the names and their sizes.

1411


3 shows a 415 V, 3-phase generator supplying a 3-phase 415/110 V transformer. Draw the individual and combined impedance diagrams to a base of 10 kVA. Determine the system fault kVA and the fault currents at the 415 V and 110 V busbars for short circuit faults on the transformer input or output terminals. Work in p.u. values of impedances.

2202






Approach of a cooling tower is the difference between temperatures of what factors?

600


What do you mean by distribution transformers?

635


why voltage form factor of PT are increase , when it is ecpected heigher spikes in system. how it is calculated.

1632


If we have use two power cable for incomer, that time how many use cbct for earth leakage protection? 1 or 2 if 1 way? If 2 way?

1610


why burdens of VTs is more than CTs?

1308


What are the functions of temperature scanner in power transformer?

1606


difference between ac series and parallel circuit

1446


what precautions to be taken while desigining a LT,HT panel. Eg-LT panel PCC panel with ACB installed. HT panel VCB panel with VCB installed. & what is main diffrence betwn IP54 & IP55 construction of panel.

2467


There is air in a room . the top and bottom of the room are at constant temp. T1 and T2. DRAW THE temp profiles if a. T1 greater than T2 b. T1 less than T2

1406


how diside ct mf exmp.200/5 ct

1619