Electronic Devices and Circuits – Multiple Choice Questions (MCQs)

1. 13. A bipolar junction transistor (BJT) has how many terminals?

   • A. 2
   • B. 3
   • C. 4
   • D. 5

2. 14. The base-emitter junction of a BJT is typically ________ biased for amplification.

   • A. Forward
   • B. Reverse
   • C. Unbiased
   • D. Breakdown

3. 15. The common emitter (CE) configuration of a BJT provides:

   • A. High voltage gain
   • B. High current gain
   • C. Both high voltage and current gain
   • D. Low input impedance

4. 16. The input impedance of a common collector (CC) configuration is typically:

   • A. Low
   • B. Medium
   • C. High
   • D. Zero

5. 17. The operating point of a transistor is also known as the:

   • A. Saturation point
   • B. Cut-off point
   • C. Q-point
   • D. Breakdown point

6. 18. Thermal runaway in a BJT can be prevented by:

   • A. Using a heat sink
   • B. Biasing the transistor properly
   • C. Using negative feedback
   • D. All of the above

7. 19. A Field-Effect Transistor (FET) is a ________ controlled device.

   • A. Current
   • B. Voltage
   • C. Power
   • D. Frequency

8. 20. Which type of FET has an insulated gate?

   • A. JFET
   • B. MOSFET
   • C. Both JFET and MOSFET
   • D. None of the above

9. 21. The pinch-off voltage is a characteristic parameter of a:

   • A. BJT
   • B. Diode
   • C. JFET
   • D. Zener diode

10. 22. An enhancement-type MOSFET requires a positive Vgs to create a channel for ________ type.

    • A. N-channel
    • B. P-channel
    • C. Both N and P channel
    • D. None of the above

11. 23. Which type of amplifier configuration provides a voltage gain less than one but high current gain?

    • A. Common Emitter
    • B. Common Base
    • C. Common Collector
    • D. Common Source

12. 24. What is the ideal input impedance of an operational amplifier (Op-Amp)?

    • A. Zero
    • B. Infinite
    • C. Low
    • D. High