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Electrical Engineering Interview Questions
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The formular of how to calculate a cross sectional cable to feed an electric motor. Examle: 15KW, 26.1A, 415V. Calculate the cable size in mm2

Sona,

3 6616

Can you explain the phase displacement between primary and secondary of power transformer of any vector group(for ex)?

 1 2497

I have two power supply.a)govt. power b)Captive power.3 phase load connected inside factory.when source change govt. source to captive some motor rotate reverse. Is phase sequence changes when if off & on?If I off generator & on it again is it possible to get changed phase sequence??

ABB,

4 5276

what is the relationship between current and frequency in AC circuit?

 3 38277

if i have one capacitor=80 micro farad which correct the unity power factor,but i want to make capacitor bank who correct the power factor.so,how to split this capacitance value?

 2 3201

What is function of condenser in fan?

 3 7125

WHAT IS RMU AND WHAT IS ITS FUNCTION AND HOW TODISCONNECT

Bhel,

3 7256

WHAT IS REACTIVE POWER?

 2 3991

In the diesel generator wihch type of power we can get it ? Like AC / DC

Aditya Birla, Indian Steel, PTPS,

2 4601

in breather of transformer how sillicon gel absorb the moisture?wat happen when the moisture in that oil?

1 3458

why transformer ratings are in kva

4 5039

What are all the points to be checked while decanting diesel from tanker lorry to HSD YARD

Cisco,

1 2836

What are all the points to be checked for a newly re-winded motor before installation

Cisco,

1 3602

sail kaott diploma ece ke interviw me qus.kis parkar ke aate hai aur G.S me kya puchate hai kya sameedyaan me kis parkar ke qu.puchate hai

Sail,

2898

What motor is used in ceiling fans and what motor is used in table fan.? why table fan is costlier than ceiling fan?

Bhel,

6 26495

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Un-Answered Questions { Electrical Engineering }

defination of lines

1525

how to calculate the earth fault current

1949

What is meant by coupling capacitor?

641

This is urgent!! What is a Thyristor-based 3-ways selector switch with Zero crossing control? how does it operate and where is it mostly found in a system?

1570

In ups static switch if i gives the supply at output end it will open the circuit in stactic switch or not if it will open then how it operates.

1834




Meaning of ingrace protection for motor.for ex IPXY

2329

IN MY SYSTEM THERE IS ONLY OVER CURRENT EARTH FAULT RELAY IS AVAILABLE. FOR THE UNBALANCE SENSING IS THERE ANY RELAY IS AVAILABLE? THE SAME CTs WHICH ARE USED FOR THE OVER CURRENT EARTH FAULT RELAY CAN USE FOR UNBALANCE ALSO?

3165

what is the difference between electrical and electronic choke?

1464

we have provided 30 nos. relay contacts in panel.I want to know how do we do the numbering for the relay contacts as per any applicable standards

1531

How to calibrate or test an LT Air Circuit breaker 440 volts, 35 KA, 800 Amps ?

2106

How do you select the pickup value of the relay?

802

The SFC of an engine is 0.25 kg/kW hr. when the fuel used has a calorific value of 36000 kJ/kg. the thermal efficiency of the engine is

1271

Explain in brief description about the operation of DG sets.

1864

Is it possible to protect 3phase overload and earth fault of the 3phase system using two CT's.

1562

hello friends.. I have a doubt regarding the operation of dc machines.. I studied in a text book that a dc machine can be used as a generator and as a motor.. is this possible? If so,please send me the info about this topic.. you can also send your info to my mail.

1525

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