Ass 00

1. The two basic kinds of transistor circuits are amplifying and switching.

True

False

2. The bridge rectifier is similar to a full-wave rectifier because it produces a full-wave output voltage. 

True

False

3. A semiconductor is an element with electrical properties between those of a conductor and those of an insulator.

True

False

4. The dc beta is defined as the dc collector current divided by the dc emitter current.

True

False

5. An ideal diode acts like a switch that closes when forward-biased and opens when reverse-biased.

True

False

6. With a half-wave rectifier, the output frequency equals the input frequency.

True

False

7. A pure semiconductor is also referred to as:

		a clean room device
		intrinsic
		extrinsic
		transistor

8. Silicon that has been doped with a trivalent impurity is called a:

		N-type semiconductor
		P-type semiconductor
		P-N junction
		covalent bond

9. In a silicon atom, what is the distance between the valence band and the conduction band called?

		energy gap
		depletion layer
		P-N junction
		intrinsic

10. A diode is a nonlinear device because the graph of its current versus voltage is:

		a straight line
		not a straight line
		inversely proportional to the resistance
		exponential

11. Ideally, a diode acts like a perfect conductor when forward-biased and:

		like a perfect conductor when reverse-biased
		like a perfect semiconductor when reverse-biased
		like a perfect insulator when reverse-biased
		like a perfect diode when reverse-biased

12. A diode that exhibits high resistance in both directions when measured with an ohmmeter is:

		shorted
		leaky
		open
		a properly operating diode

13. The knee voltage of a germanium diode is approximately ________.

		0.7 V
		0.3 V
		1.7 V
		1.3 V

14. Much of the information on a manufacturer's data sheet is:

		necessary to understand diode circuits
		necessary to troubleshoot diode circuits
		obscure and of use only to circuit designers
		necessary only to electronics technicians

15. The output frequency of a half-wave rectifier is:

		twice the input frequency
		half the input frequency
		equal to the input frequency
		four times the input frequency

16. A step-up transformer will produce a secondary voltage that is:

		smaller than the primary
		equal to the primary
		larger than the primary
		rectified.

17. What is the name of the circuit shown in the Figure 1 below?

Figure 1

		half-wave rectifier
		full-wave rectifier
		bridge rectifier
		voltage doubler

18. Which region of the transistor is physically the largest?

		collector
		emitter
		base
		beta

19. Kirchhoff’s current law describes transistor currents as follows:

		emitter current equals the sum of collector and base currents.
		collector current equals the sum of base and emitter currents.
		base current equals the sum of collector and emitter currents.
		emitter current equals collector current minus the base current.

20. Refer to Figure 2 below, what is the possible problem if VB is equal to 0 V and VC is equal to 15 V?

		transistor is shorted
		RB is open
		VCC is 0 V
		transistor is blown open

21. Refer to Figure 2, what is the possible problem if VB is equal to 15 V and VC is equal to 15 V?

		transistor is blown open
		VBB is 0 V
		transistor is shorted
		VCC is 0 V

22. Using the load line shown in Figure 3, what is the transistor's collector current if biased at the point labelled Q?

		1.5 mA
		3 mA
		4.5 mA
		7 mA

23. In the circuit shown in the Figure 4 below, calculate the saturation current?

24. In the Common Collector (CC) circuit of Figure 5 below consider β = 49 and VBE = 0.7 V.

1. Find the following:

A. IB

B. IE

C. VCE

D. VE

E. VB