« previous next »

Author Question: Why are almost all large, synchronous generators rotating field generators? What will be an ideal ... (Read 31 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?

There are more sensory neurons in the tongue than in any other part of the body.

Did you know?

Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

Did you know?

The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

Did you know?

Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

Fallow deer in field Fallow deer in field
Rotating around any node leaves a phylogeny unchanged Rotating around any node leaves a phylogeny unchanged
Small and large intestines Small and large intestines
Large Yellow Wood Sorrel Large Yellow Wood Sorrel
What are examples of ideal forms? What are examples of ideal forms?
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.
Video: Passive Smoke Exposure

For a complete list of videos, visit our video library