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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

What is dc induction motor ? and how to control its speed ?

HAL,

1 3247

difference between crane drive and line drive.

1236

can anyone explain 11kV 3core cable megger,hi pot test procedure with connection details?

2554

why we use tapechanger in primary side of transformer

Bhel, L&T,

5 7464

two bulbs of 100w and 40w respectively connected in paralel across a 230v supply.which bulb will glow bright and why?

4 12261

What is the function of RCBO? What are the different sensitivity ratings & each application?

L&T, Legrand,

1912

derive the formula of amp hours is calculated for 12v battery.where no. of plates is given

1 2552

I have made a 3 phase thyristor full bridge rectifier. But at the moment it is working only for the half bridge operation. Both the half bridges are on operation separately but when i put it into full bridge operation the oscilloscope output is zero. I rechecked that the pulses are correct for each thyristor. what could be the possible reason for this?

1305

Why should we use jelly filled armoured cables in underground Communication system? What is the use of the Jelly? If we go for unarmoured, then what happens?

Prasad Group,

1 2927

What would cause a 240v choke that should give 110v out on a 16w lamp to gradually increase to 160v?

1601

Dear all i want to know FEWA Electrical Supervisor Licence test Previous Year Questions ? If any body know please send to me shibin_75@yahoo.com

FEWA,

10800

what is mppt (maximum power point tracking ) and how they used in solar power generation ??? what are the main components used in mppt?????

2604

what is battery impedance testing and how we perform this test with four wires.

Etimaad, MRF,

1 4275

ALONG WITH MEGGER TEST FOR CHECKING OF MOTOR ,WHY WE MEASURE FOR RESISTANCE AND INDUCTANCE?

L&T,

4 7669

what is the function of supervison relay?Draw its wiring diagram.

IBM, R.R. ISPAT LIMITED,

2 5836


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Un-Answered Questions { Electrical Engineering }

i installed 100kva ups. what KVA genset they should provid in input side? plz any update formula or ans with reason.

1617


What is different between resistance grounding system and resistance earthing system?

493


Define filter?

476


WHAT IS THE CURRENT CARRYING CAPACITY OF 2.5/3 CORE HI TUFF CABLE,WILL IT SAFLEY CARRY 8.6 AMPS OVER 120 METRES,CAN YOU ALSO ANSWER WITH FORMULA FOR WORKINGS OUT ,THANK YOU 3RDYR APPRENTICE.

2895


how to extend relay operating timing in 24V dc relay card (without using Timer )

1300






how to select the no. of brushes in a lap winding?

1609


What is the rating of circuit breaker needed for 300 KVA load in 33 KV supply line in a transformer of 33 KV / 415 Volt ?

1173


Is phenomenon of resonance is harmfull fr the machine? if not or if yes please explain it?

1275


hi, in the event earth grounding is not available in a project, is there any other way to make the elcb work? fyi, i have an instant water heater (6.5kw) installed, however if there is grounding in the heating element inside the heater assembly, i will get grounded. thank you in advance to those who will answer my question.

1331


how do prepare ongc exam.how is it question model.i am electrical. which part covering in electrical.tell me

1652


can anyone please help me to find the rupturing or breaking capacity in KA of circuit breaker (MCCB,VCB,ACB etc) of HT and LT side of a distribution transformer...please help with detailed step by step answer...thank you

1396


1)How much current can a 3-1/2 core 100 mm wire carry? 2)What are the special cables required for explosion proof wiring? 3)In case you do not have coal and salt for earthing, how can you achieve good temporary earthing? 4)One horse power single phase motor is more likely to get hot than a one horse power 3 phase motor. Is it true or false, if true why? 5)What are the different types of soft starters for large motors?please explain?

4007


why ht motors are star connected?

1261


What is the equivalent circuit of a transformer and its vector diagram?

1985


what are the disadvantages in GIS over AIS

1747