REVISION SHEETNAME:_________________________________________ ID #: __________________________

PART 1. QUESTION. Identify the following. ANSWER

1 Semiconductor device that allows current to flow in only one direction

DIODE

2 The electrode connected to the P-type of a diode is called.

ANODE

3 Connection of the diode when it does not allow the current to flow.

REVERSE BIAS

4 The electrode connected to the N-type is called CATHODE5 Which electrode of diode is marked with silver color

bandCATHODE

6 The two types of semiconductor that are classified according to the material used.

GERMANIUM7 SILICON8 Connection of the diode when the positive of battery is

connect to positive of diode and negative of battery is connected to negative

FORWARD BIAS

Give the meaning of the following drawing.

Put a ( √ ) on the correct answer

FORWARD BIAS

REVERSE BIAS

Put a ( √ ) on the correct answer

FORWARD BIAS

REVERSE BIAS

Put a ( √ ) on the correct answer

Output of Half waverectifier

Output of Full waverectifier

Put a ( √ ) on the correct answer

Output of Half waverectifier

Output of Full waverectifier

Check ( √ ) which pair of diode is ON or Forward Bias.

D1 & D2

D1 & D3

D2 & D4

D3 & D4

Check ( √ ) which pair of diode is ON or Forward Bias.

D1 & D2

D1 & D3

D2 & D4

D3 & D4

The diode conduct current when the Anode is connected to the…POSITIVE………… and the Cathode is connected to the ……NEGATIVE…………

The diode does not conduct current when the Anode is connected tothe …NEGATIVE…… and the Cathode is connected to the ……POSITIVE……

Negative Half cycle

Positive Half cycle

Part I. Multiple Choice. Choose the best answer. (10Marks)

1. _____________is region in a transistor that emits majority charge carriers into the base.a) Emitterb) Basec) Collectord) None of the e) above

2. BJT or Bipolar Junction Transistor is a _______________a) Resistance controlled deviceb) Voltage controlled devicec) Current controlled deviced) Both Current and voltage controlled

3. __________ collects the emitted charge carriers through the base. a) Emitterb) Basec) Collectord) Junction

4. The word transistor means “transfer resistance” meaning:a) Transfer from low resistance to high resistanceb)Transfer from high resistance to low resistance

c) Transfer resistance to currentd) None of the above

5. The metal frame of high power transistors act as a______________:a) Heat insulatorb) Heat transmitterc) Heat regulatord) Heat sink

6. Transistor used as a switch is turned ON when:a) Emitter current is appliedb) Collector current is appliedc) Base current is appliedd) All of the above

7. Amplification is the process of ___________ the level of a weak signal.a) Limitingb) Controllingc) Decreasingd) Increasing

8. A general statement says that Ic or collector current is the sum of I emitter and I base.a) Trueb) False

9. In this configuration, the collector is made common to the base and emitter of the transistor.a) Common collectorb) Common basec) Common emitterd) None of the above

10.______________ is the middle, extremely thin, and lightly doped region. It controls the electrons flowing to the collector.a) Emitterb) Basec) Collectord) Junction

Part II. TRUE OR FALSE. Answer if the statement is either True or False. Tick the correct answer. (5Marks)

1. IN TRASISTOR CONFIGURATION: Common Base (CB), the emitter is made common to the base and collector. [ ___ ] True [ ___ ] False

2. IN TRANSISTOR APPLICATION: The transistor is OFF when there is a current applied to base. [ ___ ] True [ ___ ] False

3. IN TRANSISTOR APPLICATION: A small change in the base current of a transistor produces a large variation in the collector current. [ ___ ] True [ ___ ] False

4. IN TRANSISTOR IDENTIFICATION. High power transistors are usually designed to be mounted onto a metal frame, to conduct heat away. [ ___ ] True [ ___ ] False

5. IN TRANSISTOR IDENTIFICATION: To differentiate the symbol of NPN transistor to PNP, the arrow pointing towards the base means a NPN type transistor. [ ___ ] True [ ___ ] False

1) Recognize the devices shown in the figure below.(A) (B) (C)

(A) ……Diode……… (B) ……Transistor… (C) …Op-Amplifier……

2) Draw the schematic symbols with power connection of an Op-Amp.

3) Dual power supply has two opposite polar ity voltages (+V S & –V S ) .(T/F)

4) Most op-amp requires a dual power supply having two opposite

polarity voltages (+VS & –VS) together with common ground. (T/F)

5) What are the three basic c ircuit configurations of an OP-AMP?

a) OP-AMP without Feedback.

b) OP-AMP with negative Feedback.

c) OP-AMP with positive Feedback.

6) Recogni ze the c i rcu i t d iagrams of the fo l lowing Op-Amp appl ications .

(A) …NON-INVERTING AMPLIFIER (B ) …VOLTAGE FOLLOWER …

(C) … INVERTING AMPLIFIER ……… (D) ……SUMMING AMPLIFIER ………

(E) …OSCILLATOR …… (F) …… INTEGRATOR………

(G ) …DUAL POWER SUPPLY……

(H) ……DIFFERENTIATOR ………

High Power Transistor Medium Power Transistor Low Power Transistor Symbol NPN

Transistor

Diode analogy NPN Diode analogy PNP BJT to construction Symbol PNP Transistor

Medium Power Transistor

Diode analogy PNP

Symbol PNP Transistor

Low Power Transistor

Diode analogy NPN

BJT to construction

High Power Transistor

Symbol NPN Transistor

3.6 Review Exercise

1. Design a differential amplifier using an operational amplifier to give an output voltage, Vo = 10 (V2 - V1). Use minimum value of resistance as 10kΩ. Draw the circuit diagram.

2. Draw the circuit diagram of an inverting amplifier using op-amp, and write the expression for its voltage gain.

10k

10k 100k

100k

3. Draw the schematic diagram of an op-amp connected as (a) integrator (b) differentiator.

4. Draw the pin diagram of an IC used as an operational amplifier. Explain the functions of each pin.

5. What is a summing amplifier or adder?

2

3