Results 1 to 2 of 2

Output frequency calculation for three-phase alternator

    #1
  1. Join Date
    Jul 2016
    Posts
    2
    Reputation

    Output frequency calculation for three-phase alternator

    Rotating Machinery

    A three-phase alternator containing eight poles is turning at 900 RPM. What is the output frequency?
    Your Answer: 60 Hz

    f = Pn/120
    f = 8X900= 7200
    f= 7200 / 120
    f = 60hz.

    This was marked incorrect. But it is the correct answer.
    Reply to Post • 

  2. #2
  3. Join Date
    Mar 2015
    Posts
    29
    Reputation
    I agree with your answer of 60Hz. The same thing happend to me.
    Reply to Post • 

Login or register to leave a reply!



Related Topics

  1. Phase Sequence Relay Testing (Tengen XJ3-G)
    By lnides in forum Electrical Testing Talk
    Replies: 3
    Last Post: May 30, 2016, 03:25 PM
  2. NETA Maintenance Testing Frequency Matrix
    By DetroitLions in forum NETA Level 3 Exam
    Replies: 4
    Last Post: February 2, 2016, 12:16 PM
  3. Percentage error calculation
    By Flashman in forum NETA Level 2 Exam
    Replies: 1
    Last Post: January 8, 2016, 09:04 PM
  4. Help understanding 3 phase electrical systems
    By randywright in forum Electrical Testing Talk
    Replies: 5
    Last Post: October 22, 2015, 11:46 AM
  5. Having problems with transformer fault current calculation
    By ryan.chapman@emerson.com in forum Electrical Testing Talk
    Replies: 3
    Last Post: June 24, 2015, 09:55 PM

Related Content

Tags for this Thread

Search TestGuy
   Tag Cloud   Advanced Search
Follow us


Explore TestGuy


NETA Certification Training


Help and Support