Interview Questions Answers in Electrical Engineering, Industrial Engineering, Mechatronics Engineering

Questions / { surender kumar }

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Answers / { surender kumar }

what is corona ?

Answer

It is found in above 11 KV voltage transmission &
distribution line
[1] due to raise in voltage.
[2]Reduction in gap between the line conductors.
[3]air insulation level reduction due to natural weather.

In apearance it is faint circular glow having violet in
colour producing hissing noise.

Is This Answer Correct ?

5 Yes

0 No

Question { Samtel, 5196 }

what is 3M

Answer

Minnesota mining & manufacturing company.

Is This Answer Correct ?

1 Yes

0 No

Question { NTPC, 7615 }

one cable insulation resistance 200 mega ohm. how find 250
meter cable resistance.

Answer

Both are diffrent things.

250 Meter cable's resistance depends upon the cores/cross
sectional area/length of the cable.

Is This Answer Correct ?

8 Yes

3 No

Question { 4456 }

Is this possible to synchronize the two different ratings of dg

Answer

KVA capacity may be different.
Voltage rating must be same of these gensets on their
plates.
Phases must be match in quantity of these gensets.

Except of above Voltage,Frequency & Phase sequence matching
is must in synchronizing.

Is This Answer Correct ?

7 Yes

0 No

Question { Power Grid, 33693 }

what is the ground clearance of 400KV transmission line?

Answer

07 Mtr

Is This Answer Correct ?

11 Yes

23 No

Question { 6368 }

What will happen if apply dc source for power transformer

Answer

It will burn out.

Is This Answer Correct ?

2 Yes

2 No

Question { 3533 }

what is the function of turbo in dg sets

Answer

Turbo is functioning in two ways:
1#. Sucking & Releaseing hot fumes & smoke in open
atmosphere, which are coming from engine's combustion
chamber.
2#. Sucking the air from filter and supply it to combustion
chamber for fuel & air mixing.

Is This Answer Correct ?

4 Yes

1 No

Question { 7145 }

Why we use a shunt capacitor or synchronizing Motor To
Improve a Power factor pls reply me in this mail
dinesh_elect_eng@yahoo.com

Answer

Sinchronous motor is used to improve power factors.

Most of our equipments & electrical machinary are inductive
load i.e. in industries,institutions,large offices &
commercial buidlings are having large electrical system .
To improve the cosine angele between voltage & current we
are puting capacitor bank & Sychronous motor.

Sub-stations are having above power factor improvement
devices.

Is This Answer Correct ?

1 Yes

0 No

Question { KPIT, 26782 }

ohm's law is applicable to DC/AC/Both??

Answer

It is applicable in DC circuits.

Is This Answer Correct ?

8 Yes

18 No

Question { NTPC, 13902 }

How to know motor winding is star or delta connected without see the information table and winding connection ?

Answer

Motor star/delta connection = feed by two cable of suitable
core & size.
Motor delta connection = feed by one cable of suitable core
& size.

or

Its application area and load parameters like water
lifting,air-fan in large buildings.

Is This Answer Correct ?

2 Yes

8 No

Question { 8289 }

why transformer are not used in D.C SUPPLY

Answer

AC supply having frequency,DC donot have.
So Induction cannot take place,

Is This Answer Correct ?

7 Yes

6 No

Question { Samsung, 5163 }

i purchase a microwave which is 50/60Hz but Current Setting
60Hz in my country we usually use 50hz, can i use AVR to
solve my problem?

Answer

* Frequency convertor is different equipment in compare
with AVR.

We cann't use 60 Hz machine with 50 Hz supply.
it will effect machine's core will be hot.

Is This Answer Correct ?

1 Yes

0 No

Question { 5863 }

compressure out put air is heat or cool?

Answer

Compression mostly releases hot stuff it depends upon media usage.

Is This Answer Correct ?

2 Yes

1 No

Question { 4480 }

What happened If 3phase supply connected to slip ring side of slipring induction motor ?

Answer

Slipring induction is being apply in industries where speed variation is needful as in flour mills,saw ,grinding ,stone crushing etc.
In fact it's speed variation is to be achieved by changing the desired values of external resistance in rotor circuit.

Principally Motor is a rotating transformer and it will behave as an primary open circuit transformer and some volts will produce at the motor stator side.

Production of heat will be depend resistance connected in rotor circuit.

Regards

Is This Answer Correct ?

0 Yes

2 No

Question { Reliance, 4966 }

What is Comprehensive AMC cost for 2 TR Split AC & 4 TR Casset
AC .( If Unit is 2 Yr Old )

Answer

Negotiatiable Rs. 1500/ to1800/per Tr

Is This Answer Correct ?

1 Yes

0 No