Electrical Engineering Interview Questions
Questions Answers Views Company eMail

How are calculated the aluminium busbar cross section area?

2 5901

Are same transformer be employed for step up and step down services?

3 2753

On what basis primary and secondary of a transformer is chosen?

2 2222

how to male a d.c bettery to blow a 230v bulb?

1 1971

Can a 50-Hz designed transformer be used at 60-Hz system? Is the same remains true, when a 60-Hz designed transformer be used at 50-Hz system? Consider only frequency variation. The voltage remains as rated value in all cases. Justify the answer.

2 4651

How to protect the water pump by no load running.

Cushman Wakefield,

9 5916

Hello, im taking an introduction to PLC..and i'm having a hard time on creating a program for 2 lamps blinking alternately with this button characteristics: 1.) One push button (starts upon pressing) 2.) Same push button (when pressed again, will pause the system) 3.) Same push button (when pressed again, will continue the paused system) 4.) Same push button (when pressed within 2 seconds, will shut off the system) Pls..i know this is just a simple problem for you guys..

2 1544

In n high voltage 11kv system What happened if 1 of CT cable (IDMT) loose.Will e/f or o/c trip.please explain detail

1 1914

In UPFC,What is the need for Dc link ( DC capatior)?

1 2522

Can a transformer designed for a particular voltage and frequency rating be used for different set of mentioned ratings? Assume that the winding does not get burnt because of overheating at higher voltage. If yes, then under which constraint it is possible?

1 1123

why microprocessors are named as 8085 ,8086 etc? what's the reason for this???

HCL, Bhel,

12 23736

what is basically a pulse transformer?

1 4789

what is relay multiplier

Bhel, Wipro, Atomic Energy Commission,

1 3014

whose motors self starting synchronous or Induction motor?give fact reason why not self starting another mother

2 2303



1 14863

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Un-Answered Questions { Electrical Engineering }

In motors how many types of cooling systems were used?


what is vA rating and class of a ct.


how you will decide the distance between the power transformer and its fencing


what is the preventive maintence for ht panels and busbars and vcb abd acb's.


In Dyn11 power transformer if any one of the 3 phases connected to earth in star connected side then please explain effect of the current flow in delta connected side of transformer.(In this case if one phase is shorted to ground in star connected side then we observe the current flow in two phases only not three phases in delta connected primary side. Please explain why it is so?)


A 3-phase IM is supplied from 50 Hz system. It runs at speed of 1440 rpm and slip equal to 4 %. Calculate number of pole pairs. A 1 B 6 C 2 D 3


in the directional overcurrent and earthfault protection,normally we are setting the angle 45 deg lead for phase fault overcurrent and -45 deg lead for earthfault fro forward direction.but both the fault are operating on the same angle region only.why?how the relay will response?


how we findout a ignater is faulty or not?


what is the prinsiple of dc motor and construction and working ,application of dc motor.


how to select automotive wire by mathematical equation with given current, vlotage and resistance


What is the direction of current flow in ct secondary...means if the current is flowing from P1 to P2 then what will be the direction of current flow in ct secondaryw


How to calculate no of EARTH PIT? Describe the formula as per IS standard?


what is the prosses for getting of 33kv licence (i have completed my engineering degree & working in 33kv substation for contract basis )????


how to find impedance , mutual indatnce in transmission lines


what is the mechanism of operation of brushless dc motor why is it more wexpensive then ordinary permanent magnet motors