Interview Questions Answers in Electrical Engineering

Questions / { sennapparajan }

Questions Answers Category Views Company eMail

Answers / { sennapparajan }

Question { 13613 }

Do you know how to connect a motor of different H.Ps?

Answer

can be connect through using VFD;s. through vfd we can run
the motor at any HP rating by programming.

Is This Answer Correct ?

3 Yes

1 No

Question { 9169 }

diagram for soft stater ?

Answer

well... here we cant post such a diagram. soft starter
nothing but a starter. if will be connnected parellen with
normal DOL stater. and soft stater contacter and DLo
starter would be interlocked electricaly and mechanically.

At starting when u press the starting button the soft
starter contactoe will be closed when motor reach normal
running automativally (time setting) the S/S contactoe will
drop down and DOL starter contactor wil pick up. then motor
wil keep on running in DOL starter.

Is This Answer Correct ?

5 Yes

3 No

Question { Tech Mahindra, 107431 }

What is the function of earthfault relay?

Answer

The function of earth fault relay is to to protect the
device from earth fault. there are 2 types of earth fault
fault relays

1.neutral ct conneted earth fault relay. it will sense the
current flowing through neutral while earth lerakage.

2.three phase ct's connected earth fault relay.in normal
condition the sum of three phase ct's current in zero.

when earth fault the sum of the 3 phase ct's curret are un
balanced that time relay acts.

Is This Answer Correct ?

67 Yes

7 No

Question { KLG Systel, 27741 }

What is the meaning of BUS?

Answer

Bus is the element which can conduct electricity from one
end to another end.

Is This Answer Correct ?

1 Yes

2 No

Question { Wipro, 22363 }

what is ELCB?

Answer

ELCB-Earth leakage circuit breaker.when there is earth
leakage there is drop current in neutral. elcb will sence
the neutral and trips.

Is This Answer Correct ?

16 Yes

4 No

Question { IIIT, 62801 }

What is the difference between short circuit and overload
currents?

Answer

shart circuit current-if happens only pahase to pahse short
or phase to earth.

over laod current- it happens only when machainary or
motors take current beyond the ratings.

Is This Answer Correct ?

34 Yes

15 No

Question { ITC Infotech, 24267 }

What is the difference between AC Drive and VFD?

Answer

Both are same. comman name in Ac drive. In that by logic we
can segregate Vfd(variable freq. drive) VVd(variable
voltage drive).

Is This Answer Correct ?

1 Yes

0 No

Question { 32542 }

What happens if you give supply to the rotor of three phase
induction motor?

Answer

how ever as per question. if we gine direct supply to rotor
the totor wil be burned due to over current.

Is This Answer Correct ?

6 Yes

13 No

Question { 42145 }

what is the difference between ac and dc generator

Answer

The generator which produce alternative current is AC
generator.

which produce direct current is DC generator.The main
different is the winding of armature.

Is This Answer Correct ?

25 Yes

39 No

Question { 29091 }

why the power cut problems occur in tamil nadu?
may i know the exact reason.plz

Answer

1.No talented engineers.
2.political problem.

Is This Answer Correct ?

85 Yes

23 No

Question { 29091 }

why the power cut problems occur in tamil nadu?
may i know the exact reason.plz

Answer

Ramniveth..... ya ya..am sure. releasing book wont help.i
meant that not technically talented. they have no capabile
to organise.u may from city. just go and look at village
areas. how much problems with transmission and
distribution. if any problem accures no will will solve un
till people make some voilence. y what is the problem with
TNEB. i have TNEB.... all lazy workers.

Is This Answer Correct ?

45 Yes

14 No

Question { 4137 }

How to specific gravity of battery will check, i didnt saw
any hydrometer. & say me how to dip into the battery what
are the specifications are given in the hydrometer?

Answer

well. its depends on battery or manufacturer. first you
need to read battery maintanence manual. and hydrometer
meters is nothing. jusy the cap of ecah battery cell. and
dip and pull morethan halg capacity of acid in to meter. u
will come to know.

Is This Answer Correct ?

2 Yes

1 No

Question { 17097 }

why rotor resistance starter is not suitable for
squrielcage induction motor?why it is suitable for slipring
induction motor?

Answer

slip ring motors normally used where ever high stsrting
torque required. by connencting external resistence through
slip rings we can increase the starting torque. so that the
motor designed with slip rings.

at normal case sqrl cage motor will be used. its rotor
conducter shorted permanently./ and to reduce this motor
starting current sar-delta sarters can be used.

Is This Answer Correct ?

16 Yes

7 No

Question { 19631 }

what is the concept of star delta starter?

Answer

The concept of star delta starter is to reduce the starting
current of motor. in star connection line voltage and
pahase voltage is same which is 230v.so srating current
normally reduced.

Is This Answer Correct ?

9 Yes

6 No

Question { Toyota, 29271 }

How does MCB operate without relay..?

Answer

First question itself wrong.MCB contains small relay
mechanism and also a coil.when current flow through coil
beyong the limit the coil will act the mechanish and trips.

Is This Answer Correct ?

12 Yes

4 No