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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

What is Rough Balance Busbar Protection

1 3188

When both contractor star & delta is hold in star delta motor ?? So what happen in this case ??

1 1049

How do we calculate transformer oil in liter from the rating of the transformer.

BARC,

732

if flux and load static in dc motor and supply voltage increases 20% then what happened in speed

979

How to calculate loses in transformer of 160 KVA ?

IDV,

771

Shall we use Dyn1 transformer in place of Dyn11 for motor application as a distribution transformer

NSL Sugars,

1 1527

How to calculate fault level of 11 KV system

950

From reading, Under voltage relay used also as phase sequence relay now, Why I use under voltage and phase sequence relay in the same circuit (ATS)?

Schneider,

924

How can ou verify the size of conductor 50Sq.mm ACSR

Adani Power, Apar, EFS, Polycab, WHF,

952

What is the permissible limit of shaft voltage for 6.6 KV motors ? Why? Is there any standard is available?

1472

In what situations relays are used in Circuit breaker? In Above what rating of Circuit breaker the relays are used? Why relays are not used for CB like MCB?

Elektrotek,

799

How relay coordination has to be done? what are the inputs are required for this? Please explain this with calculation method?

Elektrotek,

886

Now I inject 1kv DC supply r&y=??? R&Y=?? Y&B=?? B&R=???? RYB&N=??? RYBN&E=????? Minimum value====???????

Integra,

1 1365

What is a neutral

Adani Ports, Dr Reddys,

4 2653

What will happen if the rotor circuit of a slipring I.M. is kept open & electric supply is given to its stator winding.

2 4104


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Un-Answered Questions { Electrical Engineering }

Starting current of a 10 HP induction Motor is ______ time’s full load current.

645


What is formula calculation size cable wire ?

980


single phase power supply give to separate one steel coup with water, what reaction create

1123


What is star-delta transformer?

190


The gauge indicates the number of amps, but what about voltage? How voltage rating (for wire or fuse) determined?

1008






3phase cable calculation formula by motor load

550


In EDO ACBs what is a purpose of closing coil and motor, what is the operation of these devices are they inetconnected. means if we give supply to motor and by BCS we charge Closing coil,what exact is operation is and how it charge a spring of ACB. Sir if anybody has an wiring diagram please send me the link to operate and EDO breaker.

1121


What is the rating factor for copper cable ( Specific value according to the type of laying ) & the voltage drop?

1015


When are the directional relays used?

181


if the motor rated speed is 950rpm. how to change the above rated speed? is it possible?

486


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

1169


how to remover corona effect and hysteresis losses from contactor

1144


what is meant by poly phase induction motor ? how its operating by single phase or three phase?

1287


IF HT CAPACITOR IN ON POSITION IS THERE ANY LOSSES I.S I SQURE OCCURS IN THE SYSTEM

1151


DEAR SIR,I GOT THE CALL LETTER FROM RRB, SECUNDERABD AS A JE-II SO PLEASE PROVIDE ME SOME MODEL QUESTION AND ANSWER PAPERS AND LAST YEAR QUESTION PAPERS

1170