Explain dc field excitation.
What will be an ideal response?
The direct current for synchronous motors is obtained from a dc exciter circuit. Such a circuit may supply field excitation to several ac machines. A dc generator may be coupled directly to the synchronous motor shaft. Other installations may use electronic rectifiers to supply the dc excitation current.
A field rheostat controls the current in the separately excited field circuit. When the field switch is open, the field discharge resistor is connected directly across the field winding.
You might also like to view...
If the salvage value of an asset is nil and it is depreciated by the double declining balance method, what percentage of the asset’s first cost will remain after its 5-year life?
What will be an ideal response?
Explain the proper way to lift an object.
Fill in the blank(s) with the appropriate word(s).
On a bearing that has been shock loaded, the race of the bearing can be dented. This type of bearing failure is called ________
A) Arcing B) Brinelling C) Fluting D) Spalling
The switching action of the commutator is called ____________________.
Fill in the blank(s) with the appropriate word(s).