Interview Questions Answers in Electrical Engineering

Questions / { venkat }

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Answers / { venkat }

Question { 10014 }

wath is skin effect?

Answer

In over head lines..
The phinamina of hissing noise and
visible glow is called skin effect.

Is This Answer Correct ?

0 Yes

1 No

Question { L&T, 7520 }

HOW TO CALCULATE LV CABLE SIZING?

Answer

L.V cable selection is Al cable 1sqmm carry 3amps
Cu cable 1sqmm carry 6amps

Is This Answer Correct ?

1 Yes

9 No

Question { 3591 }

What are the usege & different between UPS & batteries
with charging system in in Substation?( UPS 120V AC &
battery charger is 120v DC)

Answer

Batteries, are the one of the part of UPS ups are supplies
the continuous power to load. In substation control voltage
24v dc ti supplies the UPS

Is This Answer Correct ?

0 Yes

0 No

Question { 2585 }

what are types of servo motors

Answer

servo motors mainly two types
A) A.C Servo motor
B) D.C Servo motor

Is This Answer Correct ?

2 Yes

0 No

Question { NTPC, 12053 }

400 kvtransmission lines in india are connected in star or delta

Answer

DELTA Connection

as for long transmission it is economical to transfer power
with 3 wire

Is This Answer Correct ?

0 Yes

1 No

Question { 5254 }

what is deferens between HT< DG

Answer

HT DG: HIGH VOLTAGE generators like 440v/11kv output
LT DG: LOW VOLTAGE generator like 440v

Is This Answer Correct ?

2 Yes

1 No

Question { 4736 }

what is corona ?

Answer

The Phenomena of hissing noise and visible glow is called
corona

Is This Answer Correct ?

2 Yes

1 No

Question { Eskom, 6558 }

what is a motor

Answer

Motor is a mechanical device it converse electrical energy
in to mechanical energy.It works Faraday laws of electro
magnetic principle

Is This Answer Correct ?

3 Yes

0 No

Question { TATA, 3726 }

How to design the blower for motor? how to two blowers
connected in motor?

Answer

Mainly blowers are used in dc motors, its depending up on
size & kw of motos

Is This Answer Correct ?

3 Yes

6 No

Question { 3871 }

what is transformer?

Answer

Transformer is static device which converts voltage levels
(step up/ step down) without change in freqency. Its works
on farady laws of electro magntic princple

Is This Answer Correct ?

2 Yes

0 No

Question { 2764 }

What are the neccessary safety arrangements before
commissioning of HV substation?

Answer

All the switch gears open like C.B's isolator open, the line
to be earthed.

Is This Answer Correct ?

0 Yes

0 No

Question { 3071 }

If not maintained 3 phase clearance,what happened ?

Answer

elctrical flux linking with 3 phases and flash over occurs
it

Is This Answer Correct ?

0 Yes

0 No

Question { Kirloskar, 6523 }

what is the main parts of DG? how it is working?

Answer

The main parts of dg set
1. STATOR.
2. ROTOR
3. WINDING a ROTOR WINDING b STATOR WINDING
4. COMMUTATOR
5. SLIPRINGS
6. BEARINGS
Its works on faraday laws of electo
magnetic induction principle

Is This Answer Correct ?

7 Yes

1 No

Question { 5655 }

Define Current Transformer?
Working & TYpe's Of C.T.

Answer

CT Means current transformer (measuring instrument)it works
like a transformer it measures line amps

Is This Answer Correct ?

0 Yes

1 No

Question { Suzlon, 5054 }

For 33 kv HT line how much amps fuse to be fitted
pls explain with formula

Answer

33kv ht line amps are 24amps

Is This Answer Correct ?

1 Yes

8 No