Electronics-Inductors Question and Answer
Electronics-Inductors Question and Answer
51. As a generator armature passes the 270 degree point, the induced voltage is:
- at maximum negative
- between maximum negative and zero
- at maximum positive
- between zero and maximum positive
52. A value of "ten to the eighth power magnetic lines of force" is for the term:
- field
- flux
- coulomb
- weber
53. A change of one ampere per second in an inductor that induces a voltage of one volt is considered as which unit value?
- a lenz
- an ohm
- a farad
- a henry
54. What is the name of the part inside a relay that is moved by the action of the electromagnet?
- armature
- conductor
- contacts
- solenoid
55. If the primary of a 4:1 turns transformer dissipates 5 W, what is the secondary power?
- 5.0 W
- 1.25 pW
- 9.5 W
- 20.0 mW
57. When used as a filter, an inductor is
- placed in series with the load and aids any current changes
- placed in parallel with the load and aids any current changes
- placed in parallel with the load and opposes any current changes
- placed in series with the load and opposes any current changes
58. A loaded transformer will achieve mutual induction when:
- secondary current increase causes a primary current decrease
- primary current is increased by an increase in secondary current
- primary current is decreased by an increase in secondary current
- secondary current decrease causes a primary current increase
59. Which transformer turns ratio is needed to match two 16-ohm parallel devices to an output of 22.2 ohms?
- 1.38:1
- 1.67:1
- 0.72:1
- 0.60:1
60. A transformer will have:
- primary and secondary windings
- primary and secondary current
- primary wattage producing secondary current
- different frequencies for the primary and secondary