Electrical Engineering Interview Questions
Questions Answers Views Company eMail

why dc supply is given to the field of alternator

9 12156

1.why is +1+1=+2 why cant it be +3 2.Why is +1*-1=-1 why cant it be something else 3.why are the hilly areas more cooler than the ordinary areas?

ThyssenKrupp,

5 3958

can we use 7volt DC BATTERY to run a 60watt motor by stepup? Give reason for your answer?

5 3215




when will be the iocl interview results ifaced the interview on september 8 th

IOCL,

791

What is ELR, and where it is used ?

KSEB,

7 54947

what is meant by GOD in transmission system ?

Reliance,

6 8200

why motor starting current is High ?

Bhel, Jindal,

11 15926

Why fuel tanks to be earthed ?

HPCL, Ispat, Electronics, Hindustan Petroleum,

6 13287




why 400Hz is used for aircraft systems ?

Jet Airways, Cabin Crew,

14 40018

a 3 phase motor was running with delta connected, suddenly one phase winding got burnt off, what will be the effect ?

Bhel, RRB, SR,

8 10860

why 3 phase motors are preferable over single phase motors ?

6 5454

can SMPS work in DC supply ?

HCL, IBM, Reliance,

10 15369

How DC earth leakage currents can be reduced ?

675

what is the design factor that affects the size of a motor ?

Reliance, SGI,

3 3414

why ELCB's are not useful for operation theater equipments ?

Reliance,

4 5919


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Un-Answered Questions { Electrical Engineering }

how does it help for selection of a transformer.

582


for 100 HP Induction motor service factor is 1.2(SF) we placed a VFD at the motor side load is balance with 0.3 Amp's Phase to Phase but at incoming of VFD load is un-balance with 10 to 20 Amp's what will be cause of load un balance

481


although ckt breakers have taken the place of old fuse. But instead of it , these older ones are still used in the industries and homes ? why .... what are their advantages and disadvantages ? which one is leading and winning the race and competition ?

700


how to identify vector group of three phase transformer by voltage method?

392


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

779






What is the magnetic field (coil DC ) of Turbo Expander?

786


WHAT IS MEANT BY SHEATH VOLTAGE IN 132Kv cable?

1017


How we can calculate the consumption in kwh of motor on basis of kw @100% load, @50% load & @ no load.

1581


If we need4× 50mm sq cable but it's not available so we can pull 4×25mm sq 2cables

61


For a 6.6kV Motor it is recommended to do megger test with 500 V d.c and not more than 5kV d.c but the Hi voltage withstand test should be performed by 12kV AC. Why the dc voltage test should be limited but AC voltage withstand test could be with such a high voltage?

749


relation between power station capacity and voltage level?

750


What is the comparison between 30mA DP RCCB and 100mA DP RCCB and can replace it against 63A MCB

135


specific difference of ICT&Auto Transformer

444


what is the use of commutator in dc motor if we supply ac ? commutator is used to convert ac to dc.and it is used to arrange the flux in unidirectional in case of dc supply. if we give ac as supply to dc motor what is the use of commutator?

781


Size of the power cable like 1.5,2.5,4 sq.mm which area calculated from whick area or how specified the size?

891