Question { FCI, 31420 }

15 : 50 :: 18 : ?

(A) 55
(B) 59
(C) 64
(D) 62


answer is 59 but how?

Answer

I think 59 is incorrect.
15:50 : : 18 :?
3x5:10:5 :3x6:10x6=18:60
15:50 : 18:60

Question { FCI, 31420 }

15 : 50 :: 18 : ?

(A) 55
(B) 59
(C) 64
(D) 62


answer is 59 but how?

Answer

If first number is x, second number is
3 (x+2) - 1

3(15+2)-1= 50
3(18+2)-1= 59

My first answer was incorrect

Question { 3497 }

what is lap & wave winding

Answer

Does you computer have Google? If so go to this site.

http://www.google.com/search?
sourceid=navclient&aq=hts&oq=&ie=UTF-
8&rlz=1T4GZAZ_enUS396US396&q=what+is+lap+%26+wave+winding

Question { 4577 }

We know that primary transmission is done to reduce current
so that i^2*r loss could be minimised but according to ohm's
law v is directly proportional to i,which indirectly means
higher potential difference means larger current?so how the
current is minimised in high power transmission line??

Answer

You need to remember that you are transmitting watts or
kwh's and not amps. The amperage is directly related to the
load that the customer requires. According to Ohm's Law
I = E/R or watts = Volts x Amps or Amps = watts/volts.
Using a higher voltage allow you to transmit a larger amount
of watts with lower amperage and thus less voltage drop and
less losses.

Question { 7497 }

how to calculate busbar size?
ex:11000kva main what is the busbar size ?and how to select
the correct one

Answer

You calculate the load in amps and then select the correct
size bus bar. you can use the table at this site. note the
temperature.


http://www.substationsupply.com/images/PDF's/Aluminum%20Bus%
20Bar%20Alloy%206101%20Ampacity%20Chart...pdf

Question { 7497 }

how to calculate busbar size?
ex:11000kva main what is the busbar size ?and how to select
the correct one

Answer

Mr. Sakthivel with statements like "i want formula for
current density and formula foe area of conductor"
you sound very demanding. YOU WANT----? How about please
send me ------. Thank you.

If you can not calculate the area of a conductor maybe you
need to contact a forth grader and ask them how to
calculate the area of a circle. As for the formula for
current density you may need to go to a fifth grader. Get
off you butt and google current density for yourself and
say thank you when you respond.

Question { Apollo, 5452 }

how capacitor control the power factor/

Answer

Go the the site below

http://www.google.com/search?
sourceid=navclient&aq=hts&oq=&ie=UTF-
8&rlz=1T4GZAZ_enUS396US396&q=how+capacitor+control+the+power
+factor

Question { 3503 }

Difference between divercity and power factor

Answer

There is no connection between the two.
Diversity Factor - The ratio of the sum of the individual
maximum demands of the various parts of a power
distribution system to the maximum demand of the whole
system.
-The diversity factor is always greater than unity.
-70% diversity means that the device in question operates
at its nominal or maximum load level 70% of the time that
it is connected and turned on).

Google Power Factor

Question { ACS, 4702 }

how much current carry a 3-1/2 core of 100mm size
cable.explain it with solution

Answer

Nothing to explain. Just look it up in a chart like
this http://www.energy-solutions.co.uk/cable_conductor.html

Question { 16325 }

when 40 watts and 60 watts bulb is connected in series,
which bulb glows brightly ?

Answer

40

Question { 16325 }

when 40 watts and 60 watts bulb is connected in series,
which bulb glows brightly ?

Answer

posted by Syed "so calculating resistances,
R60=240*240/60=960ohm,
R40=240*240/40=1440ohm,
Req=(960*1440)/(960+1440)=576ohm,
Total current through the circuit:"

The lights are in series not parallel. You are calculating
the parallel equivalent. of course the 60 watt will be
brighter in parallel. But the question says series.
Try it over in series and the 40 w will be brighter.

Question { 16325 }

when 40 watts and 60 watts bulb is connected in series,
which bulb glows brightly ?

Answer

Ksb Quote "40 wattbulb has higher resistance(1440) so a
low current pass through it but 60 watt has low resistance
it glows brightly" That would be true if the bulbs are
connected in parallel but they are connected in series.
Read the question. Do you know what that means?

Ksbn That is incorrect. Lets find the answer.
Voltage = 240 volts
Watts = 40 watt and 60 watts
R60 = 240x240/60= 960 ohms
R40 = 240x240/40= 1440 ohms
Total of R60 + R40 = 960 + 1440 = 2400 ohms for series ckt
Amps = 240/2400 = 0.10 amps flowing thru both 40w and 60w
watts = amp²x R
watts for 60 watt = amp²x R = 0.10² x 960 = 0.01 x 960 =
9.6 watts
watts for 40 watt = amp²x R = 0.10² x 1440 = 14.4 watts
Therefore 40 watt is brighter.
Remember the bulbs are connected in series not parallel.

Question { Sona, 6623 }

The formular of how to calculate a cross sectional cable to feed an electric motor.
Examle: 15KW, 26.1A, 415V. Calculate the cable size in mm2

Answer

You don't have to calculate it. Just look it up in this
table. http://www.energy-
solutions.co.uk/cable_conductor.html
Looks like 4 mm^2 would do the job.

Question { Nokia, 6715 }

1. What are the three services offered by GSM? Explain each of
them briefly.

Answer

•Multiparty Service or conferencing: The multiparty service
allows a mobile subscriber to establish a multiparty
conversation.that is, a simultaneous conversation between
three or more subscribers to setup a conference call. This
service is only applicable to normal telephony.

•Call Waiting: This service allows a mobile subscriber to
be notified of an incoming call during a conversation. The
subscriber can answer, reject, or ignore the incoming call.
Call waiting is applicable to all GSM telecommunications
services using a circuit-switched connection.

•Call Hold: This service allows a subscriber to put an
incoming call on hold and then resume this call. The call
hold service is only applicable to normal telephony.

•Call Forwarding: The Call Forwarding Supplementary Service
is used to divert calls from the original recipient to
another number, and is normally set up by the subscriber
himself. It can be used by the subscriber to divert calls
from the Mobile Station when the subscriber is not
available, and so to ensure that calls are not lost. A
typical scenario would be a salesperson turns off his
mobile phone during a meeting with customers, but does not
with to lose potential sales leads while he is unavailable.

•Call Barring: The concept of barring certain types of
calls might seem to be a supplementary disservice rather
than service. However, there are times when the subscriber
is not the actual user of the Mobile Station, and as a
consequence may wish to limit its functionality, so as to
limit the charges incurred. Alternatively, if the
subscriber and user are one and the same, the Call Barring
may be useful to stop calls being routed to international
destinations when they are routed. The reason for this is
because it is expected that the roaming subscriber will pay
the charges incurred for international re-routing of calls.
So, GSM devised some flexible services that enable the
subscriber to conditionally bar calls.

•Number Identification: There are following supplementary
services related to number identification:

◦Calling Line Identification Presentation: This service
deals with the presentation of the calling party's
telephone number. The concept is for this number to be
presented, at the start of the phone ringing, so that the
called person can determine who is ringing prior to
answering. The person subscribing to the service receives
the telephone number of the calling party.

◦Calling Line Identification Restriction: A person not
wishing their number to be presented to others subscribes
to this service. In the normal course of event, the
restriction service overrides the presentation service.

◦Connected Line Identification Presentation: This service
is provided to give the calling party the telephone number
of the person to whom they are connected. This may seem
strange since the person making the call should know the
number they dialled, but there are situations (such as
forwardings) where the number connected is not the number
dialled. The person subscribing to the service is the
calling party.

◦Connected Line Identification Restriction: There are times
when the person called does not wish to have their number
presented and so they would subscribe to this person.
Normally, this overrides the presentation service.

◦Malicious Call Identification: The malicious call
identification service was provided to combat the spread of
obscene or annoying calls. The victim should subscribe to
this service, and then they could cause known malicious
calls to be identified in the GSM network, using a simple
command. This identified number could then be passed to the
appropriate authority for action. The definition for this
service is not stable.

•Advice of Charge (AoC): This service was designed to give
the subscriber an indication of the cost of the services as
they are used. Furthermore, those Service Providers who
wish to offer rental services to subscribers without their
own Subscriber Identity Module (SIM) can also utilize this
service in a slightly different form. AoC for data calls is
provided on the basis of time measurements.

•Closed User Groups (CUGs): This service is provided on GSM
to enable groups of subscribers to only call each other.
This type of services are being offered with special
discount and is limited only to those members who wish to
talk to each other.

•Unstructured supplementary services data (USSD): This
allows operator-defined individual services.


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Question { 10394 }

3,100,297,?

Answer

3x100-3=297
100x297-100=29600
3,100,297,29600