Machine-translated by Google. Questions are authored in English.
Top

Discussion

For the meter to register active power correctly, the flux of the shunt magnet must lag the applied voltage by

  • A.ninety degrees
  • B.the phase angle of the load
  • C.zero
  • D.forty-five degrees

Answer: A

With that lag the angle between the two fluxes becomes ninety degrees minus the load angle, and the sine of it is the cosine of the load angle. The torque is then proportional to \( V I \cos\phi \), which is the active power.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.