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Electrical Engineering Interview Questions
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Can Induction motor run at over rated speed? ( 15oo rpm is rated speed for 50HZ. is it possible to ride 3000 RPM with same motor with the help of VVVFD for continues ride of 100HZ)


3 7451

HT motors are generally connected in star, what will be the effect if we connect HT motor in Delta?

Equate, Ion Exchange,

6 13713

What is the magnetic field (coil DC ) of Turbo Expander?



What will happened if the neutral of the (star connected secondry) Xformer disconnected? (if its Above KVA rated one)



What the main causes of transient interruptions on Over-Head Distribution Lines?

Orion Laboratories,


how we can select a transformer based on a particular load. suppose we have 4 motors of rating 40 h.p , 50 h.p, 80 h.p & 100 h.p. then what rating of transformer we can select. urgent. pls reply

6 16758

pls give proper discription of selection of transformer based on particular load.

1 2407

what is a reactive power? what is the relation with power factor?


How can we calculate the motor frame sizes?



when we are going to higher voltage level in substations why we are using Sf6 circuit breakers instead of Vacuum circuit breakers.

3 3682

what is the formula to calculate the fuel consumption of a diesel generator at different diferent load.

Aegis, Network Clothing Company,

4 21695

what is a difference b/w earthing & neutral?

ABB, KEC, Sterlite,

5 8229

why we used star delta starter for above 5hp motors

2 5841

Hi Recently I got one formula that is Impedence of Xformer = Rated KVA/Root 3 * secondry voltage OF Xformer. Is it Right??????

2 2806

Why Powers are named in MW?

1 3160

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Un-Answered Questions { Electrical Engineering }

Is any AC drive(VFD) had a feature of DC injection braking? if available please mention the detail. i.e drive can supply braking torque when the motor in idle state.


1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?


explain different losses in a transformer.


I use 20 nos led tube 4feet, in pathway 100mtr approximate, so what size cable i use for lighting


tan delta equation test on alternators


What is mason's gain formula?


How to calculate the value of earth capacitance in a transmission line.


what is allowable ac mixing in dc


Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.


What is Icu and Ics and what is difference b/w them. please tell me how to calculate a size of a copper bar for a system or a breaker... reply on... would be waiting for a logical answer.


What is the form name of 'c' license, I want to download in web


whatis the commertial spec. of distribution boards ?


How one can check the MAIN of a house wiring ?


how can we make cable shedule for controll wiring ? which details must be required for it.?


How many double suspension hardware fittings are required on a double circuit transmission tower?