# MCQs in Transistor Fundamentals

Multiple Choice Questions in Transistor Fundamentals from the book Electronic Principles by Albert Malvino. Make sure to familiarize each and every questions

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

### Begin and Good luck!

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

Labels: