# 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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0
is there any engineer can solve this or give me a key of the points ?

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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
219
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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.

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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5,755
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
20,230
5,755
And we asked YOU to show some effort to solve YOUR homework. We're still waiting.

GopherT likes this.

Apr 5, 2008
17,129
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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