md. zakir hosen
{ City } tangail
< Country > bangladesh
* Profession * marketing officer
User No # 28166
Total Answers Posted # 15
Total Answers Posted for My Questions # 0
Total Views for My Questions # 0
Users Marked my Answers as Correct # 165
Users Marked my Answers as Wrong # 52
Question { 8780 }
Hi,
We facing one similar problem in our computers i.e we are
newly constructed our design department after that shifted
our computers but our computer desktop screen is vibrating.
we are conducted our electrical maintainance person he told
that is UPS problem, then we changed the UPS also again we
are facing that problem in that room only. then we put lcd
monitors that problem is solved. But in other monitors why
the computer desktop screen is vibrating please give a
suggestion to me.
Regards,
Raju.N.G
Answer
multimedia speaker around the monitor or any other active
magnetic field is present there.
Its solution is, Never put any Speaker or any Magnetic field
beside monitor.If any body face this problem at first try to
do this.I think u will get the solution.
N.B: LCD (Liquid Crystal Display)is fully free from this
magnetic effect.
More info: Earn and Learn Online,
http://a2zengineering.blogspot.com/
| Is This Answer Correct ? | 2 Yes | 0 No |
Question { 5950 }
can we use 7volt DC BATTERY to run a 60watt motor by
stepup? Give reason for your answer?
Answer
(ampere hour)rating of battery. If we assume that battery is
20AH and 60w motor is running on ac 220v. So motor need
0.273amp.if we invert 7v dc into 220v ac then this motor
definitely run.
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| Is This Answer Correct ? | 2 Yes | 1 No |
Question { 15102 }
Can anyone tell me what will happen if AC & DC supply get
mixed???
Answer
but in practical case when any dc supply mixed with an ac
supply then a abnormal situation will occur and system will
be unstable.but small quantity of dc may carry or used with
ac system.
thanking u
z_hosen@yahoo.com
| Is This Answer Correct ? | 3 Yes | 4 No |
in a large three phase induction motors usually the value
of full load slip is
Answer
No load speed-Full load speed
S=-------------------------------
Full load speed
we can easily calculate the slip by this formula.
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| Is This Answer Correct ? | 1 Yes | 4 No |
Question { 25436 }
why rating of motor in HP?
Answer
KW or MW or W is used for meaning of Electrical Power.
and HP is used to meaning of Mechanical Power sometime it
also known as BHP (Break Horse Power)which is found on the
shaft.
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| Is This Answer Correct ? | 10 Yes | 3 No |
Question { 4719 }
what is form factor
Answer
current or voltage.
we know,
R.M.S value=0.707
and Avg Value=0636
Therefore,
RMS 0.707
FF=-------=-------=1.11
Avg 0.636
thanking u
z_hosen@yahoo.com
| Is This Answer Correct ? | 14 Yes | 0 No |
Question { 10839 }
what is the working of ups.
Answer
convert AC power into DC and store in a Battery when AC
supply is interrupted (no electricity, under voltage or over
voltage) then UPS act as a power supply by Inverting DC to
AC from the charged Battery.
thanking u
z_hosen@yaoo.com
| Is This Answer Correct ? | 11 Yes | 3 No |
Question { 32562 }
what is working of no & nc.
Answer
NO means Normally Open.
NC means Normally Closed.
also In the case of IC (Integrated Circuit ):
NC means No Connection
thanking u
z_hosen@yahoo.com
| Is This Answer Correct ? | 12 Yes | 2 No |
Question { 6486 }
what is the working of vfd drives.
Answer
drive (VFD) is a system for controlling the rotational speed
of an alternating current (AC) electric motor by controlling
the frequency of the electrical power supplied to the motor.
thanking u
http://a2zengineering.blogspot.com/
| Is This Answer Correct ? | 15 Yes | 1 No |
Question { 4132 }
what is the length of air terminal in lightening arrester
system.
Answer
are short but some times capacity is same or more then long
one. its depends on the capacity and internal arrangement of
the LA.
thanking u
http://a2zengineering.blogspot.com/
| Is This Answer Correct ? | 0 Yes | 2 No |
Question { 10601 }
importance of air gap in transformer
Answer
field produced for a given current. In the equation
∫H·dL = n i , H is quite small in the iron because of its
high permeability. Nearly all of the integral accumulates in
the air gap even though the gap is very small compared to
the part of the closed path length in the iron. It reduces
the tendency of the iron to saturate to avoid harmonics in
the current.
thanking u
http://a2zengineering.blogspot.com/
z_hosen@yahoo.com
| Is This Answer Correct ? | 7 Yes | 1 No |
Question { 17989 }
if two bulb of 50w &30w apply in series having 230v the
which bulb glow bright ,why
Answer
here,
P=50+30=80w
v=230
I=?
its very simple to calculate and see that the current is
flowing throw the circuit is suitable for the LOW power
equipments as a result 30W bulb will be the brighter.
thanking u
z_hosen@yahoo.com
| Is This Answer Correct ? | 16 Yes | 20 No |
Question { Shreem Electric Ltd, 24679 }
What is mean by power factor?
Answer
and Current is known as power factor (PF) also the ratio of
active power and reactive power is known as PF.
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| Is This Answer Correct ? | 38 Yes | 4 No |
Question { 19549 }
how to calculate the powerfactor in induction motor having
name plate details? for example 1 h.p motor 1.86 A 415 V
Answer
Here, P=1H.P=746W,V=415v,I=1.85amp
Now putting this value on the equation simply we get the PF.
746=415*1.85*COSф
746
=>COSф=----------=0.9716 and it must be lagging.
415*1.85
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| Is This Answer Correct ? | 18 Yes | 2 No |
