# Electronic Principles – Section 1

6. For a pure capacitor:

A. ac current and voltage are exactly in phase
B. ac current leads the voltage by 90 degree
C. ac current is converted to dc voltage
D. ac current lags the voltage by 90 degree
E. None of the above

7. The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:

A. rotor
B. armature
C. battery
D. commutator
E. None of the above

8. In a pure inductor:

A. ac current leads the voltage by 90 degree
B. ac current and voltage are exactly in phase
C. ac current lags the voltage by 90 degree
D. ac current is converted to dc voltage
E. None of the above

Correct Answer:  C. ac current lags the voltage by 90 degree

9. Waveforms are graphs that show:

A. frequency on the vertical axis and amplitude on the horizontal axis
B. amplitude on the vertical axis and frequency on the horizontal axis
C. amplitude on the vertical axis and the passage of time on the horizontal axis
D. the passage of time on the vertical axis and amplitude on the horizontal axis
E. None of the above

Correct Answer:  C. amplitude on the vertical axis and the passage of time on the horizontal axis

10. When the collector current increases, what does the current gain do?

A. decreases
B. stays the same
C. increases
D. any of the above
E. None of the above