KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: July 2017 with video(s) Answers

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Course Name:  Information and Communication Technology
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Course Level:  Craft Certificate
Sub Level:       Module I
Course Unit:   Basic Electronics
Exam body:    KNEC
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1. Define each of the following terms as used in basic electronics. i)Electrode ii)Voltaic cell (2:22)
2. With the aid of a sketch, outline a closed circuit of three capacitors in series (C1,C2,C3) and a voltage supply V. (6:27)
3. Explain two methods used to encode BCD numbers. (1:46)
4. Using 2’s complement , evaluate #1011 1111_2#-#1000 0001_2# (9:44)
5. Determine the octal equivalent for each of the following number systems: i)#EA7_16# ii)#1101 1011_2# (10:37)
6. Explain each of the following terms as used in BCD i)Floating point ii)Bit (1:13)
7. Explain how the circuit in figure 1 satisfies the voltage law. (4:20)
8. Calculate each of the following hexadecimal arithmetic i)ADC + 12E ii)24CB - 111E (16:15)
9. Table 1 represent a truth table for logic gate. Draw the logic gate and label it appropriately (1:53)
10. A computer company intended to use the extrinsic semiconductor material to develop some components. Explain two possible applications of the material (3:16)
11. Explain two limitations of holographic storage (3:03)
12. Differentiate between volatile and non-volatile computer memories (3:27)
13. Determine the excess-3 equivalent of the BCD 1001 0110 1000 0000 (4:30)
14. Determine the colour codes for each of the following resistors resistance I)75,000,000,005 ohms or 74,999,999,995 ohms II) 34,000,020 ohms or 34,999,980 ohms (15:55)
15. Figure 1 shows symbols used for voltage sources .Identify the components labelled I and II (0:46)
16. Explain two properties that enable conduction of heat by electrons (2:08)
17. Using BCD, determine 811 + 777, giving the answer in hexadecimal (12:51)
18. With the aid of a sketch, outline the relationship between voltage, current applied to a resistor in an AC circuit (2:51)
19. A circuit has a resistance of 60 Ὠ and conductance (G) of #1.5 times 10^-3# siemens. Determine the : i)Voltage (V) ii)Current (I) (3:23)
20. Simplify each of the following decimal number operations giving your answer in binary equivalent i)74 + 89 ii)#1/8 + 1/2# (5:51)
21. Outline two patterns of the current flow in a zener diode (1:32)
22. Differentiate between doped semiconductor and undoped semiconductor materials (1:19)
23. Table 2 shows truth table. Use the truth table to draw the logic gates used. (7:59)
24. The lift mechanism is a building is controlled by four doors A, B, C and D. The lift door is open whenever B and D are in the different positions. The lift door is open, on condition that A and C are high. Draw a truth table to represent the information (13:36)
25. A group of students intend to write a term paper about De morgan’s theorem applied in solving boolean algebra. Outline five reduction techniques they are likely to include in the paper. (2:14)
26. DVD is one of the secondary memories used popularly to store movies. Explain two reasons for its popularity (1:00)
27. The potentiometer is used in the development of some appliances. Outline four areas of application of this component. (1:41)
28. Outline three techniques used for reducing radiation loss in AC circuits. ()
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