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Revision 2.05

13th October 2009

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Transistor Quiz

Try our quiz, based on the information you can find on this website. Hopefully it'll be a breeze. Submit your answers but don't be disappointed if you get answers wrong. Just follow the hints to find the right answer and learn about transistors as you go.

1. Bipolar Transistors

1 The depletion layer p.d. in a germanium diode or transistor is approximately-

a) 0.015 Volts

b) 0.15 Volts

c) 0.6 Volts

d) 0.06 Volts

2 The forward junction potential for a silicon junction is-

a) 0.015 Volts

b) 0.15 Volts

c) 0.015 Volts

d) 0.6 Volts

3 Two advantages of a germanium point contact diode over a silicon diode when used as a demodulator are-

a) It has a lower junction potential and less junction capacitance

b) It has can carry more current and is less heat sensitive

c) It has a higher reverse breakdown voltage and a higher junction capacitance

d) It has a lower reverse breakdown voltage and a lower junction capacitance

4 For a NPN silicon bipolar transistor, which of the following statements is true?

a) A thin area of the collector near to the base is heavily doped.

b) A thin area of the emitter near to the base is heavily doped.

c) The resistivtity of the collector increases near to the base.

d) A thin area of the collector near to the base is lightly doped.

5 The formula for the small signal current gain of a bipolar transistor is given by-

a) ICE/IBE

b) Ice/Ibe

c) Ice/Vbe

d) ICE/VBE

6 When testing the resistance of a junction in a silicon bipolar transistor, the expected junction resistance, when forward biased will be approximately-

a) 1k Ohms

b) 5k Ohms

c) Infinite

d) Zero Ohms

7 The current gain of a bipolar transistor used in Common Collector(emitter follower) mode wil be-

a) About 50 to 100

b) About 50 to 800

c) 1 (Unity)

d) Several thousand

8 The number of valence electrons in a silicon atom is-

a) Three

b) Five

c) Eight

d) Four

9 To increase the number of free electrons in silicon for use in transistors, manufacturers add small amounts of-

a) Germanium

b) Aluminium

c) Boron

d) Arsenic

10 When identifying the connections on a large power transistor, a useful tip to remember is-

a) The base is always the middle pin

b) The collector is usually identified by a metal tab or paint spot

c) The collector is usually connected to the metal case

d) The resistance measured between emitter and the metal case will be zero ohms.