Interview Questions Answers in Electrical Engineering

Questions / { deepak tardalkar }

Questions Answers Category Views Company eMail

why generator and t/f ratings given in kva & motor rating is in KW?

6 Electrical Engineering 11089

In 400KV Switchyard, we have used Circuit Breaker With PIR, what is the significance of PIR & why they'r used?

2 Electrical Engineering 19181

Why the size of transformer decreases if we increases the frequency?

Graphics Engineering,

5 Electrical Engineering 34612

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

Electrical Engineering 1542

Why the cost of CT increases with the decreasing of its CT Ratio (Technical Reason)?

Vedanta,

2 Electrical Engineering 5014

How the size of transformer decreases if we increases the frequency?

2 Electrical Engineering 4467

How to decide the rating of CBCT? We have 6.6Kv switchgear & having 50/1 cbct ,i want to know how this 50/1 A came? On what basis we decide CBCT reting?

Cross,

1 Electrical Engineering 8051

What is the effect of solar radiation on the design of an Isolated Phase Busduct?

Exide, Punj Lloyd Ltd,

Electrical Engineering 1844

What is the diffrence between PS & metering CT (5p20,0.5 etc.)? Why in PS class CT only Vk is given ? Is PS class CT is more accurate than metering CT?

1 Electrical Engineering 4187

What is milivolt dop test in Busducts? What is its significance & procedure to do the test?

Electrical Engineering 1566

How to calculate cable size for a particular load? i have 12 MW,11KV Motor 3 Phase, what should be cablesize? What are the points to remember for cable sizing calculations?

2 Electrical Engineering 5806

I have seen 1 video in which a person getting shock while standing at top of a train,i have 1 question? why the people sitting in the train doesn't get shock while that man getting shock from top of the train? How the earthing of train works?

Bhel,

17 Electrical Engineering 18367

How to take vector group test of a transformer? Suppose we dont know the vector group of transformer, how to check its vector group through test? I have 3 transformer DYn11 & DYno& Ynd11, how to confirm its vector group?

1 Electrical Engineering 4809

Why tripping not occur when the transmission breaks? Doesn't we provide earthfault protection for it?

1 Electrical Engineering 2756

Why tripping not occur when the transmission lines (11KV & above) breaks? Doesn't we provide earthfault protection for it?

1 Electrical Engineering 4461

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Answers / { deepak tardalkar }

Question { BARC, 19333 }

What is the operating range(tolerance) of voltage and
frequency of grid supply in india?

Answer

For Voltage, it is +/- 10% &
For Frequence +/- 5%

Is This Answer Correct ?

37 Yes

25 No

Question { 6028 }

How can be decreased the size of transformer?

Answer

By increasing the frquency, we can reduce the size of
transformer (In air craft,size of tranformer are very small
as there frequncy is 400Hz)

Is This Answer Correct ?

3 Yes

2 No

Question { 12878 }

WHAT IS THE REASON FOR THE GROUND PIN IS BIGGER IN SIZE
COMPARING TO OTHER PINS?

Answer

As R is inversly proportional to area so as area increases
R decreases & in case of fault, it provided low resistant
path for fault current.

Is This Answer Correct ?

5 Yes

0 No

Question { 4813 }

how can we check the earth resistance

Answer

By earth resistance tester that consist of 2 electrodes
along with its leads.Connect one lead from earthpit to
tester & burry 2 electrodes in earth & connect there
respective lead with tester & then check the earth R. It
should be from 0 to 1 Ohm.

Is This Answer Correct ?

12 Yes

3 No