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Q1— Section header —
1.1.1Function generators are used by electronic technicians. State TWO uses of this test instrument. (2\
1.1.2As a technician, you suspect that a resistor is faulty xplain how you would use a digital multimeter to test a resistor. (3\
1.2.1Explain how atom energy bands and energy gaps (conduction and valence bands\ change the characteristics of an insulator and conductor. (4\
1.2.2Which type of bonding is formed by the mutual sharing of electrons (1\
1.3.1The characteristic curves of diodes ar e represented by Graph 1 below. Name the types of semiconductor material that represent the curve: GRAPH (a\ (b\
1.3.2Explain how th e biasing of a unnel diode allows it to operate as a variable capacitor. (3\
1.3.3The silicon diode specification sheets have symbols that describe its electrical characteristics. What do the following symbols indicate: (a\ (b\
1.4.1A switching transistor has biasing currents of I = 10 mA and = 3 mA.
1.4.2Draw the non biased ommon emitter circuit diagram configuration, indicating input and o utput waveforms. (4\
1.5Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only True or False
1.5.5\ the ANSWER BOOK.
1.5.1Centre tapped tr ansformers are cheaper than basic transformers
1.5.2The output of the transformer produces half wave pulses of DC.
1.5.3Each half cycle flows through one diode only.
1.5.4Electrolytic capacitors can be used to filter the output DC voltag e.
1.5.5
1.6.1Analyse the characteristic curve (Graph 2\of an N channel epletion type MOSFET and explain its operation. GRAP H 2 (4\
1.6.2How does Electrostatic Discharge (ESD\ damage a MOSFET when not protected? (2\
1.7.1An inverting Op amp has the following resistors biasing t he IC 180
1.7.2What are the following Op amp circuits used for ( pplication\ (a\ Integrator (b\
Q2— Section header —
2.1Convert betw een the following number systems:
2.1.111011 to a ecimal number
2.1.245 to a inary number
2.1.3
2.2Binary rithmetic
2.2.1Subtract the following binary numbers: 100010 11101
2.2.2Multiply the following binary numbers: 10110 1001
2.2.3
2.3.1Describe the operation of an asynchronous decade counter. (3\
2.3.2Design a block circui t diagram of a 2 bit synchronous up counter. (4\ [25]25
Q3— Section header —
3.1.1want to start up. What steps would you take to troubleshoot this fault? (3\
3.2Explain what is meant by the word cache (2\
3.3What are the following ports on the mother board of a computer used for?
3.3.1VGA
3.3.2
3.4A desktop tower needs to have its CPU IC replaced. Explain ho w you would remove and replace this sensitive component, keeping ESD safety in mind also. (8\ [15] 1204102315
Q4— Section header —
4.1In the field of nstrumentation, explain what are transducers used for. (2\
4.2A photo sensitive transducer us es light to operate. Explain how this device can be used to measure the speed of a rotating disc. (5\
4.3A Linear Variable Differential Transformer LVDT transducer uses a m odified transformer to operate. Discuss the operating principle of this device.
Q5— Section header —
5.1A laptop is an example of a programming device used by a PLC programmer. Identify TWO uses for this device in PLC operation. (2\
5.2Identify and indicate the state of the f ollowing ladder logic symbols:
5.2.2
5.3A motor M is started by one push to make button A. After releasing the button, the motor continues to run. The operator can then stop the motor from two different locations: Stop buttons B and C (OR configuration\