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Q1— Section header —
1.10\in the ANSWER BOOK.
1.1The transistor is a three terminal device that consists of three PN junctions.
1.2An uneven or non sinusoidal graph is solved by means of the mid ordinate rule.
1.3In an AC circuit the inductive reactance of the inductor is directly proportional to the frequency.
1.4The collector current of a transistor will increase when the forward bias voltage of the base emitter is decreased.
1.5A P type semiconductor material is formed by using a pentavalent atom.
1.6A diode acts as a conductor when it is forward bias ed and as an inductor when it is reverse bias ed
1.7
1.8The ohmmeter must be connected in parallel across the circuit or component of which the resistance needs to be measured.
1.9A transducer is a device that converts one form of energy into another.
1.1010
Q2— Section header —
2.1Define the following SI units
2.1.1mpere (3\
2.1.2volt (2\
2.2A resistor of 3 ohms is connected in series with two resistors in parallel, having values of 3 ohms and 6 ohms. This combination is con nected across a 10 volts direct current supply.
2.2.1Draw the circuit. (1\
2.2.2Calculate the total current in the circuit. (4\ 8080602
2.2.3Calculate the total current in the circuit if the series resistor is short circuited. (4\
2.2.4Calculate the power consumed by each resistor in the parallel branch. (6\ [20]20
Q3— Section header —
3.1Define the term in phase. (3\
3.2Refer to the sketch above and calculate:
3.2.1The impedance (3\
3.2.2The capacitive reactance (3\
3.2.3The voltage drop across each component (4\
3.2.4The phase angle (2\
3.3Draw the phasor diagram. (2\ [17]17
Q4— Section header —
4.1Discuss the following processes
4.1.1Donor doping
4.1.2
4.2Draw a two dimensional diagram of the germanium atom, where the electrons move in three dimensional space. Number the orbits/shells and calculate the number of electrons on each shell
4.3Name THREE properties of a Z ener diode. (6\ [18]18
Q5— Section header —
5.1Draw a clearly labelled schematic diagram indicating the biasing voltage (the biasing of the transistor\ of a PNP and an NPN transistor. (6\
5.2Draw the characteristic curve of a transistor, showing the saturation region active region and the cut off region
Q6— Section header —
6.1Draw a circuit symbol and briefly discuss the operating principle of the light dependent resistor (LDR\. (3\
6.2Show by means of a neat graph , the difference between under damping overdamping and
6.3A network produces a 200 W output from a 20 mW input. Calculate the gain or loss of the network in els and in decibels (6\
Q7— Section header —
7.1State L enz' s law. (3\
7.2Show the principle of Lenz' s law by using the transformer princ iple on which a synchro mechanism and a servo mechanism operates. (4\ [7]7