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 11 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
YES! Correct, THANKS for helping me on my review

olderstudent

  • Member
  • Posts: 339
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.

Did you know?

If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.

Did you know?

Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.

Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

Did you know?

Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.

Ancestral versus shared derived characters involving a molecular trait. Ancestral versus shared derived characters involving a molecular trait.
heme of myoglobin (derived from PDB ID 1MBO) heme of myoglobin (derived from PDB ID 1MBO)
The chemical structure of mescaline, derived from the peyote cactus. The chemical structure of mescaline, derived from the peyote cactus.
Electron micrograph of mitochondrial DNA derived from the frog Xenopus laevis Electron micrograph of mitochondrial DNA derived from the frog Xenopus laevis
The nucleosome core particle derived from X-ray crystal analysis The nucleosome core particle derived from X-ray crystal analysis
Variable penetrance of mitochondrial mutations Variable penetrance of mitochondrial mutations
Video: Introduction to Eating Disorders

For a complete list of videos, visit our video library