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Electrical Engineering Interview Questions

Why cant we connect the motor output to generator and then generator output to motor ?

4471

who invented active elements? plz give me the complte details of active elements...

968

What is UJT PNP, NPN transistor & working principles?

TATA,

11180

what is relation of rpm with Power supply? rpm directly Proposational to power ?

4364

How to calculate the Harmonics losses in terms of cost/unit.

1115

how to select the cable size? any formula to calculate cable size?

5616

what is the frequency of direct current(dc)?

31170

What happen if two protection core (3p) of VT in LAVT are 11kv/root3, 110v/root3 and one protection core (3p) is 11kv/root3, 110v/3

3655

What is the difference between single point and double point bonding. please kindly detail about bonding of cables.

1351

I need a formula to calculate the size of cable as per load but in the terms of length. Please Reply me as i search lot of sites but i did not get the answer.

1165

How does the sensitive earth fault protection provided by cbct for motor can help in reducing the size of cable used to supply the motor?

2298

How is The split core current transformer working ?

1992

I want to do a mini project. Now I'm studying in 6th semis tor EEE Engineering.

1173

What is the difference between bushing and insulators.? what is the creepage distance?

35087

In motors how many types of cooling systems were used?

NTPC,

1173

Un-Answered Questions { Electrical Engineering }

When calculating the speed of a rotor required for a particular frequency of synchronous generator we use the equation 60f/p Is this p is the number of pole pairs of rotor & do we consider the number of pole pairs in the stator is 1?

813

i applied for the ap transco please forward the freqventley asked QA

1095

what are problems caused by the pdu in rack server

1052

Why does the rotor rotate?

1332

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

1280

Give idea about General Engineering. From which book i can study this topic. Pl. reply me via email. My email is ravi@bhelhwr.co.in, also give the name of book/website, from where i can prepare it.

1184

PLEASE SEND ME NTPC RELATED INFORMATION LIKE WHICH TOPICS HAV MORE SCOPE,BOOKS TO READ,CUT OFF...PLEASE.mail at thiru.1203@gmail.com

1212

How to test Alternator stability test for REF relay

518

The series field winding has low resistance while the shunt field winding has high resistance. Why?

400

how to calculate voltage drop and followed by cable calculation?is there avail in formula?

1153

in star-delta tranformer,if the input of star connection is 400/7v 3 kva then what is the output of delta connection?

1211

How npn and pnp transistor works

202

Single line diagrams for star to delta and DOL starters.

1372

Can anybody tell abt concrete encased earthing or grounding?

1141

We have a couple of oil tanks at our plant. One of them does not have a lightning arrester installed. My question is it necessary to install an arrestor on every tank or will this particular one be covered by the arrestor installed on the ajdacent tank, Since all the tanks are close to each other. Basically, I want to know that if these arrestors or protection works in a parituclar area of effect or influence. Thanks

1135