CHAPTER 4 BIPOLAR JUNCTION TRANSISTORS

CHAPTER 4
BIPOLAR JUNCTION TRANSISTORS

1. Which is the least of the three transistor currents?
Base

2. The ratio of the dc collector current to the dc base current of the transistor is,
dc beta/dc current gain

3. the ratio of the dc collector current to the dc emitter current
dc alpha

4. Determine the base current given dc beta=100 , dc alpha=0.85, and IC= 3.70mA
0.037mA

5. Nonconducting state of a transistor
Cutoff

6. State of a BJT in which the collector current has reached maximum and is dependent of the base current Saturation

7. Neither the base-emitter nor the base-collector junctions are forward-biased
cutoff

8. dc beta varies with
collector current and temperature

9. hFE varies with which transistor current/s?
Collector only

10. Converts light energy to electrical signal
Phototransistor

11. Devices used to electrically isolate circuits
Optocouplers

12. A key parameter in optocouplers is the CTR. CTR stands for
Current transfer ratio

13. Indication of how efficiently a signal is coupled from input to output
CTR

14. RF transistors are designed to operate at
EHF

15. What transistor category/ies uses plastic or metal packages?
General-purpose transistors

16. To operate as an amplifier, BE junction must be forward-biased and the BC junction must be reverse-biased. This is called
Forward-reverse bias

17. In a phototransistor, what transistor current/s is produced and controlled by light?
Base

18. Two basic package types
Through-hole and surface mount

19. The process of increasing the power, voltage, or current by electronic means.
Amplification