Electrical Engineering Interview Questions
Questions Answers Views Company eMail

1. What is differential relay? How it operates?

3 4836

How to calculate the Short Circuit Impedance in Transformer?

3 6596

What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works?

1507

While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply?

2 5105

What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer?

1519

Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example?

2 6174

Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient?

3 17455

. What should be the minimum and maximum ohmic value for earthing?

1 3736

Why DC Currents are not used in transformer?

4 6348

What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?

2 3770

As per the theory current doesn’t flows in Neutral, but practically it is not applicable, explain why?

3 5562

How to take the Vector Group Test in Transformer? What is the purpose of doing Vector Group Test?

2 3913

. Why the transmission lines are in 11kV, 22kV, 33kv, and why not 10kV, 20kV, 30kV?

3 9286

Why do we generate 3 Phase AC Supply? It is possible to generate 4 Phase and 5 Phase explain it?

3 6537

Explain why the Voltage drop will happen in 3 Phase line?

2 4456


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Un-Answered Questions { Electrical Engineering }

what happens if dc supply is given and the remedies for it.

1256


How to calculate capacitor bank size at a load 800kVA.

1140


Please explain me about Relay curves and their sources to read ?

1341


we need a ntpc previous papers

1425


all interview questions with answers of ntpc (2000-2009

1748






What is different between Circuit breaker and Isolater?

1195


what is the voltage rating of chiller unit sensors

2269


In a single how much maximum current and watts using

1612


how rectifier transformer work in electroststic precipetatore(esp?

2064


3Cx240 & 3Cx300 sqmm Al. cable from lv side. What is the calculation for this cable??

864


What is the application of Dyn1 and Dyn11 vector group of transformer?

2407


Pls Breifly explain about UPS (Inverter,Reserve,Rectifier,Float voltage,Boost voltage).

2280


If I have Energy Meter Ratio as 100:5 & Also I have CT Ratio as 50:5 then what will be my multiplying Factor(M.F.)

1515


HOW TO CALLICULATE RESITENCE,REACTANCE AND IMPEDENCE VOLTGE OF TRANSFORMER 13.33 KVA 144/240 VOLTS 93/56 A WITH FORMULA

1498


What is the difference between shortcircuit current, rated current of cable & MCB with example? What will be the size of cable required for 5.5 KW motor (Full load current 10 Amps approx.), Starting current with DOL is 120 Amps. Aprrox. Short circuit current with LLLG fault is 2000 Amps Approx.

1559