Interview Questions Answers in Electrical Engineering

Questions / { mahesh }

Questions Answers Category Views Company eMail

why selected genration, transmission or any at 11kv, 132, 220, 220 or 440 voltage which is propotional to 11. why does not any for ex. 12 kv 13kv or any

2 Electrical Engineering 6676

in case of induction motor when overload condition or any short ckt. why stator winding burn not to be rotor winding

2 Electrical Engineering 5085

Answers / { mahesh }

Question { 12961 }

what is the working of ups.

Answer

it is a uninterpted power supply it will be use when
normal supply are fail. it consist of three part which is
rectifire battary & invertsr in normal condition normal
supply given to this device battary chanrged from this
supply & when normal suplty is gone then load oprated in
battary supply

Is This Answer Correct ?

0 Yes

2 No

Question { 19111 }

Is a DC Transformer Possible? if Yes, Then Why, if not Then Why?

Answer

DC transformer is not possible because a Xmer work at
principle of electromagnetic induction i.e. to say they work
at rate of change of flux & mutual induction & this is not
possible in DC so Xmer work only in AC

Is This Answer Correct ?

5 Yes

0 No

Question { Bhel, 47158 }

1.what is bus cuplour and main funtions.
2.what is main function of alternator.
3.how many types of dg oils.

Answer

1) bus cuplour is nothing but the elctrical brekar which
couple the two busbar in electrical PCC. because of this
avoide electrical breakedown in continues plant.

Is This Answer Correct ?

60 Yes

5 No

Question { 7812 }

what will happen if one of the phases from a 3-phase motor
is disconnected?? stop/run at 2/3rd speed or run at same
speed????

Answer

in this condition motor get single phasing so it will be
tripped or its winding get burn

Is This Answer Correct ?

8 Yes

2 No

Question { 5654 }

what is inductance function?

Answer

inductance is the material which oppose the changing
cueent & this is the reason that current lag the voltage
at the time of inductive load

Is This Answer Correct ?

8 Yes

1 No

Question { Coastal Energen, 10572 }

WHAT HAPPENING TO TRANSFORMER????
i have the step down transformer rating 230/12v, power
rating something.,,, ok. suppose iam giving 12v to secondary
side,what will happen on primary side.,,,

Answer

if 230/12v Xmer if you provided 12v in Xmer then O/P
of Xmer will be 230v & it called as step up Xmer.

Is This Answer Correct ?

14 Yes

9 No

Question { 6364 }

Is itnecessary to use capacitor in an Fluorescent Tube
Light Fixtures? Why? What if not capacitors are not
included?

Answer

it is not a nesasary to use a capacitor for starting of
tubelight because its work as simplest automatic no/nc
switch if use a simplest switch insteade of capacitor a
tubelight also started but there process is manually.

Is This Answer Correct ?

0 Yes

3 No

Question { 6990 }

What is the minimum value required for Neutral to Earth in UPS
Panels

Answer

it should be not more than 2V

Is This Answer Correct ?

2 Yes

5 No

Question { 7782 }

what is auto transformer?

Answer

it is the single winding Xmer which work on self induction
principle

Is This Answer Correct ?

4 Yes

1 No

Question { 7453 }

why capacitor takes more current

Answer

i think a capacitor store the electrical energy & oppose
the changing voltage. so as per electrical theory a current
in a capacitor always lead the voltage so capacitor take
more current.
please note that this not a perfect answer,
this is only my openion so if you find anather answer
please send my email address.
E mail :- m.kumbhare@yahoo.co.in

Is This Answer Correct ?

4 Yes

2 No