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# Malvino: MCQ in Transistor Fundamentals

This is the Multiple Choice Questions in Chapter 7: Transistor Fundamentals from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

### Topic Outline

• MCQs in Variations in Current Gain
• 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

### Complete List of MCQ in Electronic Principles by Albert Malvino

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