« previous next »

Author Question: Why are almost all large, synchronous generators rotating field generators? What will be an ideal ... (Read 110 times)

krzymel

  • Hero Member
  • *****
  • Posts: 548
on: Jul 26, 2018
Why are almost all large, synchronous generators rotating field generators?
 
  What will be an ideal response?

Question 2

Assume a hydraulic proportional valve receives a 4-20 mA signal to control the hydraulic cylinder that extends or retracts to set the position of the blade pitch between 0 and 80 degrees. What current will set the pitch to 65o?
 
  What will be an ideal response?


ndhahbi

  • Sr. Member
  • ****
  • Posts: 390
Reply #1 on: Jul 26, 2018
Answer to Question 1

Because the there are no slip rings or brushes (or any moving contacts) between the armature and the output terminals as in the case of a rotating armature generator.

Answer to Question 2

The range of 4-20 mA is 16 mA.

16 mA/80 degrees = 0.2 mA/degree + 4 mA offset (0.2 mA x 65 degrees + 4 mA) = 17 mA.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

krzymel

  • Hero Member
  • *****
  • Posts: 548
Reply #2 on: Jul 26, 2018
Both answers were spot on, thank you once again


ndhahbi

  • Sr. Member
  • ****
  • Posts: 390
Reply #3 on: Jul 26, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.

Did you know?

Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

Did you know?

The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

Did you know?

There are 60,000 miles of blood vessels in every adult human.

Did you know?

The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

Erythrocytes contain large amounts of the oxygen-transporting protein Erythrocytes contain large amounts of the oxygen-transporting protein
A Rotating, Magnetized Neutron Star A Rotating, Magnetized Neutron Star
Scientists do research in the laboratory and in the field Scientists do research in the laboratory and in the field
A current-carrying wire is placed in a uniform magnetic field, as shown below. A current-carrying wire is placed in a uniform magnetic field, as shown below.
The Globe Fishery packs shrimp that weigh more than 1.91 ounces each in packages marked large ... The Globe Fishery packs shrimp that weigh more than 1.91 ounces each in packages marked large ...
A test field of GM papaya A test field of GM papaya
Video: Wound Care

For a complete list of videos, visit our video library