Interview Questions Answers in Electrical Engineering

ankush

{ City } faridabad
< Country > india
* Profession * engg.
User No # 23728

Total Questions Posted # 16
Total Answers Posted # 79

Total Answers Posted for My Questions # 95
Total Views for My Questions # 288556

Users Marked my Answers as Correct # 2007
Users Marked my Answers as Wrong # 953

Answers / { ankush }

Question { CESC, 9604 }

please explain working of revers power relay

Answer

reverse power relays are used to prevent the reverse power
flow to the generating stations so that in casse when
generation is off the power will not flow from grid back to
the generating system. it is unidirectional relay

Is This Answer Correct ?

7 Yes

1 No

Question { 3380 }

what is unbalanced rotating magnetic field?

Answer

all the three phase currents should have equal magnitude
and equal phase displacement if it is not the rotating
magnetic field is unabalance

Is This Answer Correct ?

4 Yes

0 No

Question { DSC, 9436 }

how much capacity(rating) of generator required to operate a
load of 100kv.

Answer

125 kva

Is This Answer Correct ?

5 Yes

3 No

Question { BARC, 15879 }

is starting current of induction is high or stating current
of ransformor is hign ,for the same rating

Answer

AS SOME AIR GAP IS PRESENT IN INDUCTION MOTOR THE POWER
NEEDED IS HHIGH SO IT RAISES THE STARTING CURRENT IN THE
INDUCTION MOTOR

Is This Answer Correct ?

1 Yes

1 No

Question { 5502 }

could i arrange a faulty and healthey battery bank togather
in parallel , if your ans is not then why?

Answer

M NOT SURE BT STILL GIVING MY OPINION.
I SAY YES COZ IF THE TWO BANKS ARE CONNECTED PARALALY THE
OUTPUT WILL BECOME SOMTHING CONSTANT THAN THE O/P OF ONLY
FAULTY BANK. AS THE QUANTITY INCREASED THE RATIO DECREASES.

Is This Answer Correct ?

0 Yes

3 No

Question { 4684 }

how the grounding[earting] is achieved on ships.

Answer

long metallic bars are used fr this purpose. the bars are
fixed to the lower part of the ships and the second end is
in water. the the water is allready salty so better
earthing is obtained. and ths earthing current reaches the
sea earth without causing any hazarts.

Is This Answer Correct ?

6 Yes

0 No

Question { 4517 }

1]how the voltages and frequency are achieved on ships.
2]how does the line and phase voltages are related on ships.

Answer

1) THE SHIPS DO HAVE AN INBUILT SUB STATION TO GENERATE
THE POWER AND APPARATUS TO OBTAIN THE VOLTAGE AND POWER OF
NEEDED RANGE AND TO RUN THE DRIVES.

2) SAME AS IN GENERAL WORLD. I.E. Vp=1.732 x V (line)

Is This Answer Correct ?

2 Yes

2 No

Question { 14726 }

Why the tank of transformer is made rectangular not circular??

Answer

as the coil of t/f is rectangular at each side of core. if
we use the circuilar tank the cooling of coil is not same
at evry point. so we insted of using circular we use the
the rectangular tank

Is This Answer Correct ?

8 Yes

3 No

Question { HCL, 13956 }

In a 3 pin plug holder, what is the purpose of diameter of
ground pin is larger than phase and nutral pin

Answer

more diameter, more radius, less area, low resistance, more
earthing

Is This Answer Correct ?

6 Yes

8 No

Question { GATE, 4477 }

when the control mechanism is present for an ammeter(1-10A)
and 1A current is apllied what will be the reading of the
meter?

Answer

arre bewkoof. control mechanism ki percentage per depend
karta he. suppose a control mechanism of 10% is applied
then the reading shown by ammeter for 1amp will be .1 amp.
understand. wo aapko confuse karte he n aap ho jate ho.

Is This Answer Correct ?

2 Yes

5 No

Question { 4560 }

What is the operational principle of direct current current
transformer and direct current potential transformer?if
possible plz reply with ckt. diagram.

Answer

IN DIRECT CURRENT T/F
THE PRIMARY STRIP IS A STRIP OF SUPER CONDUCTIVE MATERIAL
WHILE THE SECONDARY IS A THIN STRIP OF MAGNETORESISTIVE
MATERIAL.
PRINCIPAL: SORY DONT NO ABOUT THE PRINCIPAL

Is This Answer Correct ?

0 Yes

1 No

Question { RRB, 5927 }

in a dc motor we supply current only to the armature
conductors,from where is the field winding gets excited then??

Answer

o helo bewkoof
y are u confusing me.
dear there are two types of dc motors
1. self excited
2. seperately excited

in self excited the armature and field are fed from single
supply
while in seperately excited motors two different supplies
are used

Is This Answer Correct ?

31 Yes

2 No

Question { 12068 }

what is the difference between 'Control Transformer & Potential/Voltage Transformer'?

Answer

A control t/f is one which gives constant o/p voltage and
current , so known as control t/f.
These are basicaly used in electronics circuits.
while PT are used for the measurement of voltages.
so simple......

Is This Answer Correct ?

7 Yes

2 No

Question { 3423 }

why do we prefer -48 volt instead of -24volt or -12 volt
etc. ??

Answer

aisa kuch nae he......... all have there individual
aplications.
if the load is more 48v is used, for medium 12v and for low
6 v......... so easy

Is This Answer Correct ?

1 Yes

2 No

Question { 4258 }

suppose a fan is running with phase and neutral. if its neural
is touched to body. then fan get stopped. if this fan is
connected to phase and ground supply..then why it runs?

Answer

if d neutral is conectede to the fan body, the ckt doesnt
complete , so the fan stops. but if we use grount instead
of neutral, the fan runs as the ckt is complete here.
so simple.........

Is This Answer Correct ?

4 Yes

0 No

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