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 2885

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

L&T,

3 6564

IS THE ANY DIFFERENCE B/W GENERATORS & ALTERNATORS

6 6766

what should be the value of proper neutral earthing resistance?

ABC,

3 6471

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

L&T,

3 11241

what is the IS foe lightning arrester?

1655

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

HCL, Viva,

4 75670

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

7 25835

Which motor is suitable for mixer grinders.

12 20879

what is earthing/

B.Tech, CPCL, Mobiserv,

3 5093

what is the use of earthing?

CPCL,

1 4776

why we provided electrical earthing?

CPCL,

5 7866

explain the details about vaccum circut breaker and advantages?

CPCL, Unisol,

4 6074

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

2 4139

why commutator is attached with only dc macine

ONGC,

8 10795


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Un-Answered Questions { Electrical Engineering }

How to confirm the Phase shifting Transformer VECTOR GROUP relation , as below ZNy11.45d10.45-ZNYy0.15d11.15

2719


If the rated speed of a d.c. Shunt motor is1440 r.p.m, which method of speed control would you suggested to obtain a speed of 1500 r.p.m?

663


what about electrical pannel.? What is meant by plc pannel.?

1850


What is CCM in Electrical ? where can we use this material?

901


What is the vector group of a transformer,how can it be found out?

1538






what is the constructional difference between a power transformer and potentian transformer?

1229


What is the function of the generator exciter?

893


Meter p.t. ratio= 3×230/400 , c.t.ratio = 3×1 (2) A what is m.f.

1296


explain the function of brush less dc motor?

1547


what is meant by surge? what we called for high currents?

1462


we use 400/5A ct and 35/roor3KV,/0.1/root3KV,0.1/root3KV pt ratio. What is the multiple factor of this meter.

1539


how to design the heater in temperature control unit to heat 50KL of water?

1393


i want to know how to determine that a surge arrester work properly in 11kv system. and how to test a 12kv surge arrester

1664


Define early construction of human being

1405


How to measure the Harmonic Distortion of UPS ie THD?

1714