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Author Question: Variable-frequency drives (VFD) reduce the speed of AC motors by: A) Applying an adjustable ... (Read 90 times)

D2AR0N

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on: Jul 24, 2018
Variable-frequency drives (VFD) reduce the speed of AC motors by:
 
  A) Applying an adjustable magnetic brake to the motor.
  B) Controlling the voltage available to the motor, like a light dimmer.
  C) Limiting the current to the motor.
  D) Controlling the frequency (Hz) of the power to the motor.

Question 2

When operated with the same power source, which induction motor will have a higher RPM: a four-pole motor or a six-pole motor?
 
  A) The four-pole when turning clockwise, the six-pole motor when turning counterclockwise.
  B) The four-pole motor will turn faster.
  C) The number of poles does not affect the speed of the motor.
  D) The six-pole motor will turn faster.


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reversalruiz

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Reply #1 on: Jul 24, 2018
Answer to Question 1

D

Answer to Question 2

B


D2AR0N

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Reply 2 on: Jul 24, 2018
Gracias!

bitingbit

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Reply 3 on: Yesterday
Wow, this really help

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