Interview Questions Answers in Electrical Engineering

Questions / { giridhar rao }

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Answers / { giridhar rao }

Question { Honeywell, 36679 }

What are the tests to be taken on a transformer and
generator?

Answer

sc test & oc test done on t/f, no load,load test

Is This Answer Correct ?

60 Yes

9 No

Question { 23816 }

What is the ohms law?

Answer

At constant temp. the voltage across any
branch is directly proportional to the current flowing
through that branch.

Is This Answer Correct ?

5 Yes

5 No

Question { Honeywell, 29219 }

why is the rating of transformer done in kva and not in kw.

Answer

because the core losses and cu losses depends on only
voltage and current and is independent of power factor so
t/f rating is in KVA

Is This Answer Correct ?

50 Yes

8 No

Question { 11515 }

what happens to the speed of a DC series motor when series
field winding is removed?

Answer

in motors n is inversely proportional to flux from
Eb=z*n*fy.so if flux becomes 0 then n is infinite

Is This Answer Correct ?

2 Yes

3 No

Question { 27289 }

What is the normal earth resistance?

Answer

it is between 25-30ohms when soil is dry.when the soil is
wet it falls to below 4.

Is This Answer Correct ?

4 Yes

7 No

Question { 13155 }

what is ferranti effect?

Answer

receivg end voltage is greater than the sending end voltage
bcoz of capacitive effect at receving end in a transmission
line

Is This Answer Correct ?

16 Yes

3 No

Question { ABB, 11810 }

motor and transformer working with same principle so why
motor rotor was roted and transformer not roted

Answer

in motors and in generators the winding is distributed
whwrer as in trf winding is concentrated.

Is This Answer Correct ?

13 Yes

25 No

Question { Airtel, 68615 }

which type of A.C motor is used in the fan (ceiling fan,
exhaust fan, padestal fan, bracket fan etc) which are find
in the houses ?

Answer

single phase capacitor start-induction run motor

Is This Answer Correct ?

80 Yes

19 No