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Electrical Engineering Interview Questions

how we calculate the motor rating of pump for water suction ?its any formula for that plz give thank u

5966

on what factor insulation resistance depends

7061

explain how to protect high rise building from the risk of lighting.

1091

State uses of different types of stsrters with different capacities of motors as below: a. up to 5HP b. above 5hp to 10hp c. above 10hp to 20hp d. above 20hp

968

What is power factor? How to improve Power factor? draw a circuit diagram showing the connection of power factor improvement equipment to the electrical instillation.

1583

A 7 storey building has a floor area of 35,000sq.ft on each storey. On the ground floor 11KV electrical sub-station is to be erected. A load of 3kw for every 400sq.ft (p.f is 0.8) is proposed for each floor. fire pump 7.5hp, water pump 5hp, lift 2 nos, each 10hp and 20shop load of each shop is 5kw. calculate a. load each floor b. total load of building c. L.T feeders for aech floor and from transformer to main. d. distribution diagram e. capacity of sub-station/capacitor bank f. line diagram

1532

what is load balancing. what maximum load diffence is allowed between phases.

2695

-What shall be short circuit current of LV switchgear for a 1000 kva, 11.415kv, 3 phase tranformer with 5% reactance.

1223

-How do you select cable size for a given load at a given distance from source of supply. How do you find voltage drop.

908

-What should be minimum value of insulation resistance and maximum value of earth resistance at any electrical instillation and what is method of testing the same.

1101

-What is leakage current . how much leakage current is allowed.

8786

why fuse is not used in neutral...

27799

what is the relationship between horse power and watts

16787

what is power and what is watts detailed description and formulas

2714

why 30 ma elcb is used ?why cant 100 ma?

19565

Un-Answered Questions { Electrical Engineering }

What is 11 N1 and 12 N2 in single phase Transformer ?

1056

can i use the six sigma method which is used in management area, in state estimation of power systems?

938

what is Fault level? why it is calculated? how will u decide same for our plant?

1063

Can Anyone suggest the Standards (IEC or IS) for selecting copper current density?

442

please explain how to do 'pole drop test' on generator?

1847

Why the magneti fields are not passes from southpole to north pole

1187

why actual valve timing diagram is different than ideal valve timing digram of a 4 stroke engine?

4411

What is Instantaneous Earth fault relay,how will work

1205

What is superposition theorem?

172

Why can't we take NO LOAD TRIAL of motors having V1 mounting??

1050

what is the difference between ups & inverter

4170

how many current required for hypo test

968

How can we find the breaking capacity of a Load breaker switch (LBS) fed from 11 kv supply??ex:50KA, 26kA etc???detailed step vice answer pls.

1094

Can 4pole (3 phase+neautral )RCCB proper functioning in only 3 phase load (no neautral, no Earth) ?

1212

CAN ANYBODY PLEASE TELL ME HOW TO DESIGN A SERIES REACTOR FOR LIMITING SHORT CIRCUIT FAULT CURRENT??

1003