Electrical Engineering Interview Questions
Questions Answers Views Company eMail

IF avr is voltage regulator of genset means why we are giving genset CT sense to AVR ?

ABB,

3 5325

what is the use of CurrentTransformer in AVR ?

2 4439

what is the lemen of a single 5mm 13000mcd white led pls reply

Eskom, Sona,

1 4095

how much current does 3ph. 10 hp ac motor draw.

8 50467

Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

1500

technically, what is the reason behind starting the motor star the delta connection .. and what other ways to do this rather than using " star-delta transformer"

Wipro,

1521

What is the different types of cable & current capacity of cable

1422

what is formula of illumation calculation

1616

what happens when one of the phases out 0f 3 phases been removed under working condition and no load condition will the machine run if so plz send me why

2 3591

why the supply power frequency is 50hz in india? where as it is 60hz in US?

4 7186

How loading get increased in generator not the speed, while we increasing steam to turbine.

2 3585

what is purpose of manual bybass in ups

3 4264

how much current does 3ph a.c & d.c motor drawn.Plz. provide formula with example.

5 5546

Why the earth cable have current 1A - 2A , it is safety for Electrical system or earth cable should be zero amps ? how to troubleshoot?

1551

What do you mean by ACB and VCB?

L&T,

3 10702


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Un-Answered Questions { Electrical Engineering }

IF TVM OF TRANSFORMER SHOWS POWER FACTOR ON 33 KV SIDE AS 0.97 LAGGING AND ON 132 KV SIDE IS 0.75 LEADING.IS THIS CORRECT.WHERE IS PROBLEM.

1827


what is the difference between general inverter and solor inverter clerly explain plz

1639


How to maintain ac plant?

1492


Why is tan-delta test and capacitor measurement done on alternator?

1654


How can we increase the capacity of Energy.?

1645






what is the disadvantages of common earthing for AC and DC equipment? (i am talking about inverter control room and inverter duty transformer earthing is common...?)

1156


We have a couple of oil tanks at our plant. One of them does not have a lightning arrester installed. My question is it necessary to install an arrestor on every tank or will this particular one be covered by the arrestor installed on the ajdacent tank, Since all the tanks are close to each other. Basically, I want to know that if these arrestors or protection works in a parituclar area of effect or influence. Thanks

1533


What is the effect of solar radiation on the design of an Isolated Phase Busduct?

1825


in 6.6 kv vaccum circuit breaker vaccum bottole vaccum capacity ????

1541


Why we specify TNC switch with 1NO 1NC ,2NO 2NC ? how we get connection.?

1234


How wire size can define in electrical wiring? What is the ratio?

1767


Calculate torque developed by the 3-phase, 5 H.P., 4 pole induction motor runs at 1500 rpm A 23 N-m B 21 N-m C 10 N-m D 0 N-m

4300


In our plant we have installed new MCC with ELR and CBCT which is detecting some leakage current in the system but it leading to some confusion when to check that in which feeder which is drawing current we put off the whole panel itself but still CBCT detecting some leakage current so can anybody ans me , where i am going wrong or how to detect whether its actual leakage or CBCT malfunctioning.

1678


What is the formula for selecting the cabels according to load? How to calculate what sq.mm cabel to be used?

962


Write the force balance equation of ideal spring element.

753