This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Which of the following is a benefit derived from using a pulsewidth-modulated (PWM) variable ... (Read 17 times)

serike

  • Hero Member
  • *****
  • Posts: 542
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


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

ryansturges

  • Sr. Member
  • ****
  • Posts: 338
Reply #1 on: Jul 24, 2018
Answer to Question 1

b

Answer to Question 2

a


serike

  • Member
  • Posts: 542
Reply 2 on: Jul 24, 2018
Great answer, keep it coming :)

tranoy

  • Member
  • Posts: 344
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

On average, the stomach produces 2 L of hydrochloric acid per day.

Did you know?

Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Did you know?

The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.

Did you know?

After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

Summation of Heart Sounds, Variable S1 Summation of Heart Sounds, Variable S1
11.2 The chemical structure of mescaline, derived from the peyote cactus 11.2 The chemical structure of mescaline, derived from the peyote cactus
Negative feedback control of a regulated variable. Negative feedback control of a regulated variable.
An overhead camshaft engine equipped with variable valve timing on both the intake and exhaust ... An overhead camshaft engine equipped with variable valve timing on both the intake and exhaust ...
Variable Gases: Methane Variable Gases: Methane
Some drugs are still derived from natural sources Some drugs are still derived from natural sources
Video: Semidiscontinuous DNA replication

For a complete list of videos, visit our video library