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ABB Electrical Engineering Interview Questions
Questions Answers Views Company eMail

How to identify Motor leads in their order coming out from winding without tag (U1, V1, W1 & U2, V2, W2)?

6 41012

I have a transformer whose primary operates at 230V, 50Hz for which the secondary voltage will be 12V, 50Hz. What will be the secondary voltage if the primary is fed with 400V, 8KHZ Signal?

6 6505

Why TAP changer provided in primary side of HT transformer ? and why not in secondary?

9 42457

What is system earthing?what are the types?

1 2145

Why P.F(power factor)relay should not be connected to the D.G(diesel generator) incomer side

1 2581

How can we calculate the KVA rating of a Distribution transformer from its core details?


What is the min.& max distance between two earth spikes is required for measuring earth resistance of an earth pit? Is the manufacturer of Earth tester decides this? Pls explain.

3 6868

What happens if the capacitive reactance of a transmission line is very high?

5 12017

what is the purpose of battery tap voltage.

3 17897

Why we Specify Transformer rating 433 V Instead of 415V ?

8 23804

what is the diff. between x'mer , isolation x'mer & ultra-isolation x'mer ?????????????


what is the procedure for three phase motor differential relay testing can it do with single phase test kit?

1 12496

What is power factor ?What are the benefits of improved power factor & how. Please explain with examples.?

5 9689

What is Grounding? any difference b\w earthing? if yes plz explan??

3 5013

why generally transformer are in star to delta or delta to star used?

8 16670

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