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 10 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
Wow, this really help

abro1885

  • Member
  • Posts: 337
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

Did you know?

Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

Did you know?

Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

Did you know?

Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.

Did you know?

Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

Bacterial colonies, each derived from a single cell Bacterial colonies, each derived from a single c Bacterial colonies, each derived from a single cell Bacterial colonies, each derived from a single c
Preschoolers benefit from helping with meal preparation, especially with foods they like Preschoolers benefit from helping with meal preparation, especially with foods they like
A variable valve timing solenoid being controlled by applying voltage from the PCM. A variable valve timing solenoid being controlled by applying voltage from the PCM.
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 ...
Coenzymes derived from vitamin B12 Coenzymes derived from vitamin B12
Injuries That Benefit from Burn Center Care Injuries That Benefit from Burn Center Care
Video: How proteins function? How do proteins work?

For a complete list of videos, visit our video library