Topic Outline
- MCQs in Variations in Current Gain
- MCQs in Load Line
- MCQs in Operating Point
- MCQs in Recognizing Saturation
- MCQs in Transistor Switch
- MCQs in Emitter Bias
- MCQs in LED Drivers
- MCQs in Effect of Small Changes
- MCQs in More Optoelectronic Devices
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. The current gain of a transistor is defined as the ratio of the collector current to the
- a. Base current
- b. Emitter current
- c. Supply current
- d. Collector current
2. The graph of current gain versus collector-current indicates that the current gain
- a. Is constant
- b. Varies slightly
- c. Varies significantly
- d. Equals the collector current divided by the base current
3. When the collector current increases, what does the current gain do?
- a. Decreases
- b. Stays the same
- c. Increases
- d. Any of the above
4. As the temperature increases, the current gain
- a. Decreases
- b. Remains the same
- c. Increases
- d. Can be any of the above
5. When the base resistor decreases, the collector voltage will probably
- a. Decrease
- b. Stay the same
- c. Increase
- d. Do all of the above
6. If the base resistor is very small, the transistor will operate in the
- a. Cutoff region
- b. Active region
- c. Saturation region
- d. Breakdown region
7. Ignoring the bulk resistance of the collector diode, the collector-emitter saturation voltage is
- a. 0
- b. A few tenths of a volt
- C. 1 V
- d. Supply voltage
8. Three different Q points are shown on a load line. The upper Q point represents the
- a. Minimum current gain
- b. Intermediate current gain
- c. Maximum current gain
- d. Cutoff point
9. If a transistor operates at the middle of the load line, an increase in the base resistance will move the Q point
- a. Down
- b. Up
- c. Nowhere
- d. Off the load line
10. If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point
- a. Down
- b. Up
- c. Nowhere
- d. Off the load line
11. If the base supply voltage increases, the Q point moves
- a. Down
- b. Up
- c. Nowhere
- d. Off the load line
12. Suppose the base resistor is open. The Q point will be
- a. In the middle of the load line
- b. At the upper end of the load line
- c. At the lower end of the load line
- d. Off the load line
13. If the base supply voltage is disconnected, the collector emitter voltage will equal
- a. 0 V
- b. 6 V
- c. 10.5 V
- d. Collector supply voltage
14. If the base resistor is shorted, the transistor will probably be
- a. Saturated
- b. In cutoff
- c. Destroyed
- d. None of the above
15. If the collector resistor decreases to zero in a base-biased circuit, the load line will become
- a. Horizontal
- b. Vertical
- c. Useless
- d. Flat
16. The collector current is 10 mA. If the current gain is 100, the base current is
- a. 1 microamp
- b. 10 microamp
- c. 100 microamp
- d. 1 mA
17. The base current is 50 microamp. If the current gain is 125, the collector current is closest in value to
- a. 40 microamp
- b. 500 microamp
- c. 1 mA
- d. 6 mA
18. When the Q point moves along the load line, the voltage increases when the collector current
- a. Decreases
- b. Stays the same
- c. Increases
- d. Does none of the above
19. When there is no base current in a transistor switch, the output voltage from the transistor is
- a. Low
- b. High
- c. Unchanged
- d. Unknown
20. A circuit with a fixed emitter current is called
- a. Base bias
- b. Emitter bias
- c. Transistor bias
- d. Two-supply bias
21. The first step in analyzing emitter-based circuits is to find the
- a. Base current
- b. Emitter voltage
- c. Emitter current
- d. Collector current
22. If the current gain is unknown in an emitter-biased circuit, you cannot calculate the
- a. Emitter voltage
- b. Emitter current
- c. Collector current
- d. Base current
23. If the emitter resistor is open, the collector voltage is
- a. Low
- b. High
- c. Unchanged
- d. Unknown
24. If the collector resistor is open, the collector voltage is
- a. Low
- b. High
- c. Unchanged
- d. Unknown
25. When the current gain increases from 50 to 300 in an emitter-biased circuit, the collector current
- a. Remains almost the same
- b. Decreases by a factor of 6
- c. Increases by a factor of 6
- d. Is zero
26. If the emitter resistance decreases, the collector voltage
- a. Decreases
- b. Stays the same
- c. Increases
- d. Breaks down the transistor
27. If the emitter resistance decreases, the
- a. Q point moves up
- b. Collector current decreases
- c. Q point stays where it is
- d. Current gain increases
Post a Comment