Electrical Engineering Interview Questions
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When calculating the speed of a rotor required for a particular frequency of synchronous generator we use the equation 60f/p Is this p is the number of pole pairs of rotor & do we consider the number of pole pairs in the stator is 1?

UOM,

1335

Importance of fault current in power transformers and how to monitor the same? How is it different from winding temperature?

Impulse,

1299

3,12,24,33,_ ,75,150 Find the missed number in this sequence

HCL,

2 18608

What is given by the definition in BIL IMP/PF = 950/395 kV. This was found in a name plate of a power transformer.

AES,

1814

can we keep open the secondary of current transformer?

Jyona Power,

1 2210

is dc transformer is possible ?

Jyona Power,

4 3936

is this the formula of building wiring to get the main breaker.Watts/volts*.8%+higher motor*(25%)=ampere. yes or no or send the correct formula for building wiring.

1151

why we generate 11kv power supply in generating station?

DBG, NTPC,

1 2998

what will be the effect if you were using different brands of outlets?

TESDA,

1438

What will be the output of an alternator ,if the field current is single phase ac supply.

DRDO,

1 2662

Question about ct secondaries connections?

1 2169

What is the function of turbo charger in generators

1 2814

Which rccb 30ma,100ma,300ma sensitivity should be used in domestic line and what is difference, advantage and disadvantage of all three

2 19331

sir, in a industry present pf is 0.54 pf 25hp power is there its want improve 0.9 pf. which suitable capacity capacitor is suitable please inform me.

2 2810

what will happen if synchronous machine rotor fed from single phase ac supply 

1276


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Un-Answered Questions { Electrical Engineering }

HOW DO YOU CAN CHECK A 15KV DIODE, WHETHER IT IS OK OR NOT?

1470


11 kv input, 66 kv input advantages

900


what is the electrical?

1609


Dyn1 transformer vector group testing how to do

1299


what is reactive power?, why its measured in VA ? is it transient behavior of system?

1768






if 12v battery get discharged for 2 months after if we put charge it will charge again?how much time it will take to charge?

1493


IF I KNOW THE AREA OF CROSS SECTION OFTHE WIRE , WATTAGE OF THE LOAD ,VOLTAGE SUPPLY WHAT IM GIVING TO THE LOAD AND ALSO POWER FACTOR OF LOAD ....... SO GIVE ME FOR WHAT AMOUNT OF CURRENT I SHOULD USE WHICH TYPE OF CABLE?

1408


What is the test block protection relay if any body know plz explained

985


What Is HO factor in power selection

1527


How to Calculate KA Rating of Main LT Panel

1145


What will be the current drawn by HT motor, if low voltage is applied.. any formula to calculate the LT amps of HT motor.?

981


How much costly in percentage wise is sandwich busduct costly than air insulated busduct of any rating?

1329


diff b/w normal grounding and resistance grounding

1382


What is different between Circuit breaker and Isolater?

1195


An ELHNC 80amp 240v 30mA RCD is tripping periodically, every 30 - 180 seconds is it safe to disconnect the protection circuit?

1585