Jet Airways Trainee First Officer
Join Date: May 2008
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AMPERE HOUR ques floating...FYI
A 10 amp-hour battery can provide ten amps for one hour, or one amp for ten hours. The capacity is a product of current and time. The more proper unit would be the watt-hour, but you can find that by multiplying voltage and current (i.e., a 10 Ah 12V battery is a 120 Wh battery).
Note that this doesn't mean you can get 100 amps out of that battery for six minutes. Maximum current is limited by the physical construction of the battery. If you draw current out too quickly, the chemical reaction becomes limited, and this can even cause permanent or catastrophic damage (read: explosion) to the battery. Usually, a battery is designed for a specific current drain and this will be current at which the amp-hour capacity is measured.
So a 150 AH battery can only provide 150 amperes of current(if its 100% efficient which is never true. A/c batteries shud be atleast 80 % efficient).
For a system of 450 Amperes three batteries ,150AH each,must be connected in parallel to serve a system of 450 Amperes for an hour...
Also bateries have power rating..that must also be considered . In winters you must need atleast 33% buffer for battery back up: More AH to be used in cold temp..
fly safe
Note that this doesn't mean you can get 100 amps out of that battery for six minutes. Maximum current is limited by the physical construction of the battery. If you draw current out too quickly, the chemical reaction becomes limited, and this can even cause permanent or catastrophic damage (read: explosion) to the battery. Usually, a battery is designed for a specific current drain and this will be current at which the amp-hour capacity is measured.
So a 150 AH battery can only provide 150 amperes of current(if its 100% efficient which is never true. A/c batteries shud be atleast 80 % efficient).
For a system of 450 Amperes three batteries ,150AH each,must be connected in parallel to serve a system of 450 Amperes for an hour...
Also bateries have power rating..that must also be considered . In winters you must need atleast 33% buffer for battery back up: More AH to be used in cold temp..
fly safe
Join Date: Jan 2011
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@harsh786techy
nice..!!
so according to the explanation given, answer to Radar_contact's question
a 150Ah battery will provide 450amps for how long????
would be?? not 20min ofcourse..
or we can just say its just a theoretical question and not technically applicable
nice..!!
so according to the explanation given, answer to Radar_contact's question
a 150Ah battery will provide 450amps for how long????
would be?? not 20min ofcourse..
or we can just say its just a theoretical question and not technically applicable
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@Uniform
A 150 Ah rated battery cannot sustain a system of 450Ah...In short it will not provide current to 450 Ah...thats what my knowledge says..Practically the battery will leak,explode, or get damaged.
I find this ques irrelevant or one of the option must be "Irrelevant"..
Only three 150 Ah batteries can sustain a system of 450 Ah, that too connected in parallel...
fly safe
I find this ques irrelevant or one of the option must be "Irrelevant"..
Only three 150 Ah batteries can sustain a system of 450 Ah, that too connected in parallel...
fly safe
Join Date: Aug 2010
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Can all of you guys, trying to show their knowledge over here,start a new thread n discuss it over dere????and keep this thread to let ppl know any updates about the exam dates n recruitment process...
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hi..
can any1 tell me what is the procedure to get the confirmation mail from jet airways to take the exam with lapsed ir.
herd a few ppl have received the confirmation mail from the HR of jet..
do u need to personally contact the concerned people... ????? or is there any other way.....???
can any1 tell me what is the procedure to get the confirmation mail from jet airways to take the exam with lapsed ir.
herd a few ppl have received the confirmation mail from the HR of jet..
do u need to personally contact the concerned people... ????? or is there any other way.....???
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@Learjet35alpha
Confirmation mail??? I dont think everyone with lapsed IR need to get an individual confirmation regarding same. Its been already confirmed that we dont really require a current IR, but still you can e-mail the jet HR department for your satisfaction.
@all
few queries if anyone could explain
1. What is the theoretical maximum range that an aircraft at FL420 will obtain from a VOR beacon situated at 400' amsl?
ans - 276nm
2. What is the approximate maximum range that an aircraft flying at 25000' would expect to obtain from a VOR beacon situated 900' amsl?
ans - 198nm
whts is th difference between THEORETICAL MAXIMUM RANGE and APPROXIMATE MAXIMUM RANGE??
Confirmation mail??? I dont think everyone with lapsed IR need to get an individual confirmation regarding same. Its been already confirmed that we dont really require a current IR, but still you can e-mail the jet HR department for your satisfaction.
@all
few queries if anyone could explain
1. What is the theoretical maximum range that an aircraft at FL420 will obtain from a VOR beacon situated at 400' amsl?
ans - 276nm
2. What is the approximate maximum range that an aircraft flying at 25000' would expect to obtain from a VOR beacon situated 900' amsl?
ans - 198nm
whts is th difference between THEORETICAL MAXIMUM RANGE and APPROXIMATE MAXIMUM RANGE??
Last edited by Uniform.; 11th Feb 2011 at 03:22.
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@uniform
the theoretical maximum range is the range of radio signal as determined by the formula for line of sight waves (1.25(rootH1+rootH2)).
the theoretical range does not take into account various factors such as signal attenuation, transmitter power, propagation conditions.
in reality, the maximum range is actually less than the theoretical range.
regarding the second question, no idea how it is calculated !!
the theoretical range does not take into account various factors such as signal attenuation, transmitter power, propagation conditions.
in reality, the maximum range is actually less than the theoretical range.
regarding the second question, no idea how it is calculated !!
Join Date: Aug 2010
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The approximate maximum range of a VHF signal is given by the formula:
VHF Range in nm = the square root of (1.5 x altitude in feet)
Example: At 7,000 ft AMSL, approximate VHF range = square root of (1.5 x 7,000) = square root of (10,000) = 100 nm.
VHF Range in nm = the square root of (1.5 x altitude in feet)
Example: At 7,000 ft AMSL, approximate VHF range = square root of (1.5 x 7,000) = square root of (10,000) = 100 nm.
Join Date: May 2008
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Hello guys,
All the folks here who has contacted Jet Airways HR about there queries and have got a reply from them, can they please again contact them and try to know when Jet Aiirways is planning to conduct the exam.
Fly safe
All the folks here who has contacted Jet Airways HR about there queries and have got a reply from them, can they please again contact them and try to know when Jet Aiirways is planning to conduct the exam.
Fly safe