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  1. #1
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    A 10 HP blower motor is fully loaded and operating at a brake hp of 10. The blower is moving 10,000 CFM of air. A variable frequency drive decreases the motor rpm and thus the CFM to 8,000 CFM.

    By what % is the motor HP decreased?

    A. 20%
    B. 30%
    C. 40%
    D. 50%



  2. #2
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    Dec 2002
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    D

  3. #3
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    Sep 2004
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    bump this

  4. #4
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    A
    Life goes on long after the thrill of living is gone.

  5. #5
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    Originally posted by ct2
    bump this
    So ct2, is that a B?



  6. #6
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    Oct 2001
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    C

  7. #7
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    Jan 2005
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    daytona florida
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    c

  8. #8
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    Sep 2004
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    Norm : no that isnt a b ...your thread was falling to the bottom of the list last nite so I "bumped it back to the top" I am waiting for a reply to the message I sent you before I give an answer

  9. #9
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    Norm

    Ok, so what is the answer ? Any one else going to give it a shot ?
    Life goes on long after the thrill of living is gone.

  10. #10
    Join Date
    Sep 2002
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    South Dakota
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    Give this a little more time and then not only will I give the correct answer I will explain why it is correct.

    This is useful information.


  11. #11
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    Aug 2003
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    1,841
    c

  12. #12
    Join Date
    Feb 2005
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    69
    I would say (A). Since 8,000 is 20% less than 10,000.

  13. #13
    Join Date
    Sep 2004
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    3,157
    tech cr that would be to easy true the CFM has been reduced by 20% but I'll bet the HP reduction will not be 20%

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