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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

What happen when ct secondary are open circuited? why same thing is not happen in ordinary transformer?

BARC,

3 5370

difference between over current and over load protection?

BARC,

5 11344

explain working of differential protection for a transformer?

BARC,

1 2423

derive DC RMS value for half wave rectifier?

BARC,

2242

By just seeing a transmission tower, how can we knew the voltage it carries..?[110kv, 220kv, 400kv...]???

KSEB,

5 5881

what do you mean by cl PS CTs? What are technical details required for it's manufacturing?

1 2575

when voltage increases current decreases & vice versa why it is so?

3 3468

What is meant by inverse definite mean time (IDMT)& definitemean time (DMT)?

5 31719

what is droop control?

BARC,

1106

what do u understand about FACTS? how they are useful?

BARC,

1056

what is significance of B-H curve? how it differs form ordinary transformers to Amorphous Transformer?

BARC,

2 20067

explain with diagram how to protect transformers and substations from over current with help of CT's?

BARC,

1084

how oil in the MOCB was reduced compared with OCB? what are the features of the MOCB?

Asahi, BARC, K-Electric,

1849

what is resistance?

5 3760

What is the formula to find out two phase active & reactive power

Areva,

1224


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Un-Answered Questions { Electrical Engineering }

Is RTCC panel needs any control supply.

998


What are the advantages of stationary armature and rotating field system?

193


ASTM D 3455 - Standard Test Methods for Compatibility of Construction Material with Electrical Insulating Oil of Petroleum Origin has been used for Testing Transformer Oils with a product placed in it. Aged Control Oil has a Power Factor of 0.032% at 100°C. Aged Oil with a Test component has a Power Factor of 0.093% at 100°. Is this increase acceptable? If not why? How much increase is acceptable?

941


can we use trip light with bus coupler?

970


State the points to be considered for selecting a particular type wiring.

1089






Compare salient pole and cylindrical rotor machines.

1004


How the circuit breaker is selected for Induction motor of 100 kW, 415 volt, 0.85 power factor, 0.95 efficiency ?

751


Define branch?

148


Is it possible to make a 5P10/ CT Ratio 50/1A Burden 5VA

708


Draw the equivalent circuit of crystal oscillator?

164


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

845


How to calculate of maximum demand if given 628kw, 785kva, 0.8 p.f.

772


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?

201


Discribe type of fault in DOL and stardelta startor.

1341


what are the stresses in circuit breakers ?

1041