Principles of AC Circuits Flashcards
The total opposition to current in an ac circuit is called:
Impedance
In order to reduce the effects of eddy currents, the iron core of an ac magnetic circuit is:
A) Made of silicon steel B) Laminated C) Of the split core type D) Annealed E) Both A and D
B) Laminated
Whenever there is a change in voltage there is a property that will oppose this change in voltage. This property is known as:
A) resistance
B) inductance
C) capacitance
D) impedance
C) capacitance
Silicon steels are used for the core material of ac magnetic devices in order to reduce the:
A) skin effect
B) hysteresis effect
C) eddy current effect
D) dielectric effect
B) hysteresis effect
The loss caused by the stress upon the insulation by an ac voltage is called the:
A) dielectric loss
B) skin effect
C) hysteresis loss
D) eddy current loss
A) dielectric loss
The increase in the ohmic value of an ac circuit caused by the stress upon the insulation of the conductors is called:
A) dielectric loss B) skin effect C) hysteresis D) reluctance E) none of the above
A) dielectric loss
The heat produced by the constant reversals of the magnetic domains within an iron core is due to:
A) eddy currents
B) hysteresis
C) skin effect
D) dielectric loss
B) hysteresis
What are the four factors that can cause the ac resistance to be higher than the dc ohmic value?
1) skin effect
2) dielectric losses
3) eddy current losses
4) hysteresis losses
The __________ loss is caused by ac voltage stresses within the insulation of the conductor.
dielectric
There is a tendency for an ac current to flow more toward the outer part of the conductor. This is called the ____________.
Skin effect
Using silicon steel for the core material of ac equipment reduces the _______________
hysteresis losses
