shahin


{ City } chittagong
< Country > bangladesh
* Profession * assistant manager (technical)
User No # 30198
Total Questions Posted # 0
Total Answers Posted # 11

Total Answers Posted for My Questions # 0
Total Views for My Questions # 0

Users Marked my Answers as Correct # 94
Users Marked my Answers as Wrong # 31
Questions / { shahin }
Questions Answers Category Views Company eMail




Answers / { shahin }

Question { Kirloskar, 16407 }

What is the need of filtering ideal response of filters and
actual response of filters?


Answer

To get the deviation of the filter.....

Is This Answer Correct ?    32 Yes 7 No

Question { 5851 }

What is bandpass of a transformer?


Answer

Though Transformer is an inductive circuit so it can act as
a low pass filter.......

But if the transformer's supply frequency is higher then
the transformer then the paper insulation and di-electric
oil act as capacitor. Then the combined effect of
transformer's inductance and capacitance act as a band pass
filter.....

Is This Answer Correct ?    3 Yes 0 No


Question { Reliance, 6940 }

what is the reason for balance of voltage in magnetic
balance test?


Answer

because the flux cuts the voltage with the adjescent limbs.
say if we apply voltage in r-n leads of star connected
secondary then we can get almost 80% voltage in y-n lead
and 20% VOLTAge in b-n leads. Because the b-phase is far
away from y-phase from r-phase.... this the reason.....

Is This Answer Correct ?    8 Yes 0 No

Question { century, 15022 }

what happens if generator is running leading power facotor?


Answer

If the generator is running with leading powerfactor , the
generator's generated voltage will increase.....

Ref. Puschein & Loyd book.

Is This Answer Correct ?    10 Yes 1 No

Question { ABB, 13133 }

If the supply voltage is same (say 440V) whether a system
designed for 60 Hz frequency will work with 50 Hz frequency
or not , if so pl. give clarification.


Answer

Dear all I've seen that all r telling dc motor, ac motor,
converter etc. ABB has asked for a system not for motor/
inverter. As the equaiton of joysbag reduction of frequency
of 10% will cause increment of 16.67% of flux. Though the
system is designed about 60Hz. Then the system component
may be malfunctioning. All of equipments of the system must
be changed as frequency has changed.....

Is This Answer Correct ?    10 Yes 1 No

Question { Mecon, 7904 }

why is the core of the underground cable is spiral in shape
instead of straight?


Answer

Rolling is one of the fact....
But the main reason for spiral is mechanical.
In straight wire the share force is less than that of
spiral wire. hance the spiral wire's strength is too much
higher than straight wire.......this is the main fact....

Is This Answer Correct ?    5 Yes 0 No

Question { 5497 }

When geneartor is running in poor lagging side power factor
its excitation current increases then it is running in
improved lagging side.Kindly tell me when gen is running in
leading side what will happen


Answer

When generator is running in leading side then the
excitation current should decrease to improve the pf....

Is This Answer Correct ?    0 Yes 3 No

Question { Alstom, 26052 }

what is the function and use of oil filled cables specify
its advantages and disadvantages


Answer

Adv
1. Increases the insulation between cable & earth.
2. Cable Cooling

Dis

1. Too much expensive
2. Meintenance is tough

Is This Answer Correct ?    3 Yes 5 No

Question { 7374 }

why we used to transmitt the power at higher voltage why
not at lower voltage


Answer

the main reson for high voltage transmission for reducing
line loss and improving the efficiency. Another reason for
high voltage transmission is Long distance transmission.

Is This Answer Correct ?    2 Yes 0 No

Question { Reliance, 11274 }

why protection and metering CT's are always connected in
star why not in delta?


Answer

Because the star point is needed to be grounded. Which
isn't possible in delta system....

Is This Answer Correct ?    20 Yes 13 No

Question { 3958 }

what is the meaning of harmonic in AC waves and when which
are prduce and what is the effects on line and give any
other information about harmonics


Answer

The phenomenon of generation of signal which have multiple
times of frequency of supply signal is known as Harmonics
of that applied signal....

Normally harmonics may generates in diffrent way....
It effects the power quality of electric signal on line ...

Is This Answer Correct ?    1 Yes 1 No