Electronic Devices MCQs Quiz Multiple Choice Questions & Answers

1. A transistor has how many PN Junctions?

1. 1
2. 2
3. 3
4. 4

2. In an npn transistor, the majority carriers in the emitter are neither both free electrons

1. free electrons
2. holes
3. niether (a) and (b)
4. both (a) and (b)

3. The barrier potential across each silicon depletion layer is

1. 0 V
2. 0.3 V
3. 0.7 V
4. 1 V

4. The base of an npn transistor is thin and

1. Heavily doped
2. Lightly doped
3. Metallic
4. Doped by a Pentavalent material

5. The emitter of a transistor is generally doped the heaviest because it

1. has to supply the charge carriers
2. is the first region of the transistor
3. must possess low resistance
4. has to dissipate maximum power

6. When a transistor is fully switched ON, it is said to be

1. shorted
2. saturated
3. open
4. cut-off

7. A FET consists of a

1. source
2. drain
3. gate
4. all the above

8. The extremely high input impedance of a MOSFET is primarily due to the

1. absence of its channel
2. negative gate-source voltage
3. depletion of current carriers
4. extremely small leakage current of its gate capacitor

9. When a transistor is used as a switch, it is stable in which two distinct regions?

1. saturation and active
2. active and cutoff
3. saturation and cutoff
4. none of the above

10. The term BJT is short for

1. binary junction transistor
2. both junction transistor
3. base junction transistor
4. bipolar junction transistor

11. What are the two types of bipolar junction transistors?

1. pnn and nnp
2. ppn and nnp
3. pts and stp
4. npn and pnp

12. 12. The magnitude of dark current in a photo-transistor usually falls in what range?

1. mA
2. nA
3. MA
4. pA

13. Junction Field Effect Transistors (JFET) contain how many diodes?

1. 4
2. 3
3. 2
4. 1

14. When not in use, MOSFET pins are kept at the same potential through the use of:

1. conductive foam
2. nonconductive foam
3. shipping foil
4. a wrist strap

15. A MOSFET has how many terminals?

1. 2 or 3
2. 3
3. 4
4. 3 or 4

16. Hybrid means

1. mixed
2. single
3. biunique
4. none of the above

17. If the operating point changes, the h-parameters of transistor

1. also change
2. do not change
3. may or may not change
4. none of the above

18. There are .............. h-parameters of a transistor

1. two
2. four
3. three
4. none of the above

19. For a silicon transistor, when a base-emitter junction is forward-biased, it has a nominal voltage drop of

1. 0.7 V
2. 0.3 V
3. 0.2 V
4. VCC

20. A very simple bias for a D-MOSFET is called:

1. self biasing
2. gate biasing
3. zero biasing
4. voltage-divider biasing

21. The dc load line on a family of collector characteristic curves of a transistor shows the

1. cutoff region
2. active region
3. saturation region
4. all of the above

22. When a transistor is used as a switch, it is stable in which two distinct regions?

1. active and cutoff
2. saturation and cutoff
3. saturation and active
4. none of the above

23. The h-parameter approach gives correct results for

1. small signals only
2. large signals only
3. both small and large signals
4. none of the above