Electrical Engineering Interview Questions

What is the difference between air & vaccum circuit breakers?

IOCL,

5787

What are the components of a substation?

IOCL,

5227

What is ELCB?

Bhel, CDS, IOCL,

11890

How voltage step down is done?

IOCL,

5059

How does a 3 phase induction motor is started?

IOCL,

5846

can anyone tel me what is competency of electrical supervisor??

ONGC,

3900

minimu size and length of gi earth pipe

4025

we have consol make 3 phase servo stabilizer for cnc m/c. while installing the earth neutral voltage is 1.7 volts at stbilizer off condition and when stabilizer get on en voltage reaches 4.8 volts (new earthing is done and neutral is helthy condition all phase to neutral volts 440,442,441 v)why this happen.solution for cause.

5613

how to calculate the over current rating of 3phase motor

5803

why sec of ct should be kept shorted

5273

difference between isolator and circuit breaker?????

11408

how to improve IR value in HT motors?

16015

Why we are using air gap magnetic condutors

Ford, IOCL,

5734

I want to know how to calculate the size of electricity cable in building?

1556

whether Transformer is singly excited or doubly excited machine?

8054

Un-Answered Questions { Electrical Engineering }

please give me all the Alarm .Trip ,Safety Relays & Conditions of UPS Systems mail me on ashokbabunhce@gmail.com

1385

Why the frequency of ac in india is 50 hz but in some other countries it is 60 hz.

1709

In both 600/1000 V cable and 450/750 V cable, we can supply 415 V. However for distribution, all utilities are using only 600/100 V instead of 450/750 V. What is the reason?

1519

how to select correct size of power cable for inverter duty motor

947

at what base you will tell the direction of rotation of dc motors and generators?

682

What is the use of lag compensator?

690

temp of cast resin 1500kva tx formerwent up to 138.c but came down very fast to about 100.c within 20 mins when load was reduced from 70% to 60%

1510

Why do power lines not short out when they fall into water?

1509

Whar is the KvA rating of 33Kv substation & actual kv rating of power generaating station.

1905

54 Comments Alok and Bhanu play the following min-max game. Given the expression N = 38 + X*(Y – Z) where X, Y and Z are variables representing single digits (0 to 9), Alok would like to maximize N while Bhanu would like to minimize it. Towards this end, Alok chooses a single digit number and Bhanu substitutes this for a variable of her choice (X, Y or Z). Alok then chooses the next value and Bhanu, the variable to substitute the value. Finally Alok proposes the value for the remaining variable. Assuming both play to their optimal strategies, the value of N at the end of the game would be?

1789

State the types of distortions in amplifier?

700

Explain what is use of lockout relay in ht voltage?

689

I have finish diploma electronics and five years experience in electrical field in ht service how can i get c licensce or other electrical certificate

1180

Why sometime AVR and sometime Booster coil is used in Alternator? what is the diferance between AVR & Booster coil due to which they are selected

2591

best manufacturer for busbar for outdoor switchyard having double bus bar scheme, can any one share technical specification of busbar. 132kv voltage ?

1263