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Electrical Engineering Interview Questions
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IF 3 NOS.OF HEATERS,3KW CAPACITY EACH,1 NO.HEATER CONNECTED IN R PHASE,1 IN Y PHASE AND 1 IN B PHASE.THEIR END POINTS CONNECTED IN STAR.IF I CONNECT THIS STAR POINT TO NEUTRAL OR DO NOT CONNECT TO NEUTRAL.WHAT WILL THE DIFFERENCE.

 3 4114

In 2500kva transformer how much is the withstand High voltage power frequency between primary to secondary and earth? And secondary to primary and earth?

Honeywell,

1 3017

1)What will you do if main incomer VCB fail in your site ?

Honeywell,

7 6409

why in isolation transformer we dont get any shok?

 2 2948

wht is the purpose of the earth electrode other then earthing

 1 1338

how r charge carriers produced

 1074

what is power system transient condition

 1 2094

what is thresold of perception

 1040

what is positive , negative & zero equivalent system resistance

 1006

is there interlocking between duty and standby chilled water pumps?

 1 2610

I want to know if it is possible to use Variable Frequency Drive to reduce the current required for starting a motor?

Descon,

3 2796

How magnetic balance test of single phase transformer is done,Especially in ESP transformer rectifier set.

Bhel,

2 3701

pls send link about servo motor

 3 2778

List out the types and name of the motor under their application?

 1067

what is IP55,IP65

 4 43950

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Un-Answered Questions { Electrical Engineering }

What is the diffrence (Technical & Construction ) between CBCT & Normal CT?

1094

While performing stability test of differintial cts how to know the voltage and current on both side of the transformer?

2491

why Lightening Arrester Probe sharp at Top of telecom tower.

665

why is the power generator connected as star earthed or star earthed through reactance and what its features ?

691

what is ps impedance test

1167




explain comutator action in detail.thanks

1139

What is turn ratio of a transformer?

157

How to arrange a hous hold earthing system to keep minimum earth resistance( below 7ohms).

965

wish of these transformer uses oil?

729

ratings of lightning arrester

1133

As we use capacitor bank in 3ph ckt to improve PF, can we use capacitor in single ph domestric use, in house we have Fan,Mixer,electric cooker,iron,tube choke they also lag the system,because it is inductive load. if it is possible to improve PF of single ph system-- if yes- type of capacitor to be used,connection diagram, working in detail. if no-- list it.

752

how much allowable resistance that can be difference in motor all coils?

1350

What shall be the secondary output voltage if the primary winding of a 220/6V, 50 Hz transformer is energized by an 110V, 60 Hz supply?

203

After synchronization with grid what is the demand value QKVAR and how we will maintain that?

1201

why we use two slope(differential & restraining) in differential relay.but in busbar protection differential we are using only one slope?please explain

1204

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