Electrical Engineering Interview Questions
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Just a silly question but just to make my curious mind bac to normal - Why was not 67 and 67N relays built into a single relay as i have noticed that the R,Y,B CT wiring end up into the 67 relay while the common of the R,Y,B CT wiring end up into the 67N relay. Then it was better if a single relay was manufactured just like the distance relay (21). Another question i would like to ask is - how do we know where the 67 and 67 N relay has to be placed.why is it not placed at the transformer bay? In the substaion that i am working -i have noticed that it is placed between a breaker and a common double bus bar and this line bay is connected to another substation at a remote place which is furthur connected to a load. B U S______CT for 67 & 67N ______Breaker _____ remot s/s. B A R

1 1894

What should be the minimum depth of ground laid 66 kv ht cable?

L&T,

3 4651

IS THE ANY DIFFERENCE B/W GENERATORS & ALTERNATORS

6 4174




what should be the value of proper neutral earthing resistance?

ABC,

3 4574

what is the minimum distance between substation wall and LT panel outer surface?

L&T,

3 8929

what is the IS foe lightning arrester?

885

How to calculate the Meter constant for the given Meter (by using any formula)

Viva, HCL,

4 59262

What is the difference between a Vacuum Circuit Breaker and a Load Break Switch?

7 17767




Which motor is suitable for mixer grinders.

12 14967

what is earthing/

CPCL, B.Tech, Mobiserv,

3 3131

what is the use of earthing?

CPCL,

1 3503

why we provided electrical earthing?

CPCL,

5 5449

explain the details about vaccum circut breaker and advantages?

CPCL, Unisol,

4 3826

Car battery + terminal allways biger than - terminal! Why?

2 2799

why commutator is attached with only dc macine

ONGC,

8 7259


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Un-Answered Questions { Electrical Engineering }

How will be the single line diagram of series trip HT breaker? how it works?

1322


define the non synchoronism of synchoronous machine in general g or m??

762




903


what happen if the parallel generator phase angle shift by 1 degree in manual mode

749


what is the Pickup/drop off ratio in BCPU relays

1626






should %impedance be high or low in a power transformer? if so why?

735


how much leakage current is allowed in MC61A L&T make relay?

2286


what is 30-phase of transformer

767


if grounding is notdone at regular intervals for long distance transmission, will the load connected at distribution end receive voltage during negativehalf cycle of the sine wave?

793


why the perameters of secondary circuit are more important then that of the primary circuit of induction motor?

538


To make a basic instrumentation amplifier, it takes A One op-amp with a certain feedback arrangement B Two op-amp and seven resistors C Three op-amps and seven capacitors D Three op-amps and seven resistors

752


what is relation between ct and pt ratio with multiplication factor of a energy meter? is there any other factor on which multification factor depend?

958


Saving in copper achieved by converting a 2 winding transformer in to an auto transformer is determined by A voltage transformation ratio B load on secondary C quality of core material D size of transformer core

1186


some time we open engine breaker 8.0 MW load but plant not trip. and another time engine open 4.0 MW load engine trip why? individually engine breaker open & individually emergency stop why difference?

586


i want to know that how the height of Ct ,cvt ,LA calculated on the basis of creepage distance

1089