Electronic Principles – Section 2

16. The value of a capacitor can be made larger by:

A. increasing the area of the plates
B. decreasing the area of the plates
C. increasing the frequency of the applied voltage
D. increasing the voltage applied to the plates
E. None of the above

Correct Answer:  A. increasing the area of the plates

17. The value of a capacitor can be made larger by:

A. moving the plates further apart
B. moving the plates closer together
C. increasing the voltage applied to the plates
D. decreasing the voltage applied to the plates
E. None of the above

Correct Answer:  B. moving the plates closer together

18. The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?

A. 0.25
B. 180
C. 0.5
D. 4
E. None of the above

19. Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?

A. 5 Ohm
B. 50 Ohm or more
C. 100 Ohm
D. 6 Ohm
E. None of the above

Correct Answer:  B. 50 Ohm or more

20. Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?

A. Clockwise
B. Counterclockwise