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Author Question: Which of the following is a benefit derived from using a pulsewidth-modulated (PWM) variable ... (Read 29 times)

serike

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on: Jul 24, 2018
Which of the following is a benefit derived from using a pulsewidth-modulated (PWM) variable frequency
  drive (VFD) versus an analog SCR VFD?
 
  a. Controlled starting
  b. Reduced problems with harmonics
  c. Adjustable torque limiting
  d. Adjustable operating speed

Question 2

After being energized, what type of function could a typical relay with normally closed contacts directly
  perform?
 
  a. De-energize a crankcase heater
  b. Energize an inducer motor
  c. Start a compressor
  d. Complete a circuit to a motor start winding


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ryansturges

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

b

Answer to Question 2

a


serike

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Reply 2 on: Jul 24, 2018
Great answer, keep it coming :)

nguyenhoanhat

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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