solve problem

Discussion in 'Homework Help' started by yasser-ali, Dec 16, 2014.

  1. yasser-ali

    Thread Starter New Member

    Dec 16, 2014
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    is there any engineer can solve this or give me a key of the points ?
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Yes, but a good engineer knows what her time is worth...
     
  3. #12

    Expert

    Nov 30, 2010
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    In the homework section, you have to show your effort in order to receive guidance.
     
  4. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    Posted 2/12 and due 12/23 ... too bad your instructor only left you with 10 months and 11 days to complete the project.
     
  5. john_paul

    New Member

    Dec 18, 2014
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    How do you determine the number of poles and the size of the induction motor (in hp) if the slip is between 0.3 and 0.5?
    All I know is that the slip = (synchronous speed - rotor speed)/synchronous speed, synchronous speed = (120*synchronous frequency)/number of poles
     
  6. DumboFixer

    Active Member

    Feb 10, 2009
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    Of course it is possible that 2/12 means that the project was set on 2nd December and not 12th February (not everybody uses mm/dd/yy , some use dd/mm/yy ) so instead of 10 months and 11 days they only have 21 days.
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Another way as I know it is Synchronous speed = (60 * Frequency of supply)/Pole Pairs.
    Max.
     
  8. john_paul

    New Member

    Dec 18, 2014
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    Any other suggestions?
     
  9. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    Very true and after I read where the document originated, I'd have to go with 21 days and not my exaggeration of time which I apologize. I did find it interesting that the Instructor used 02/12/2014 as the posted date but stated it was due 23rd December 2014, a minor inconsistency.
     
  10. WBahn

    Moderator

    Mar 31, 2012
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    No more inconsistent that a paper here using 12/02/2014 and then using December 23, 2014 elsewhere would be, which is not too rare to see. I tend to prefer the format 23 Dec 2014 when I can use it but if I have to use the 'slash' notation then I use the MM/DD/YY (or YYYY) convention since that is what most people in my audience will assume.
     
  11. yasser-ali

    Thread Starter New Member

    Dec 16, 2014
    3
    0
    i asked to give me a key
     
  12. WBahn

    Moderator

    Mar 31, 2012
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    And we asked YOU to show some effort to solve YOUR homework. We're still waiting.
     
    GopherT likes this.
  13. bertus

    Administrator

    Apr 5, 2008
    15,634
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    Hello,

    The following pages of the EDUCYPEDIA will give you information on the induction and synchrone motors:
    Induction motor
    Synchronous motor

    This might help you solving part of the problem.
    Now show us YOUR effort.

    Bertus
     
  14. yasser-ali

    Thread Starter New Member

    Dec 16, 2014
    3
    0
    can you see any mistake ?

    [​IMG]
     
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