KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: July 2019 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. Describe two types of voltage regulators (0:56)
2. Figure 1 shows an AC circuit with three resistors R1=5Ὠ, R2 = 8Ὠ, R3 = 7Ὠ and a voltage of 40V. Determine the current in the circuit. (2:57)
3. Convert the BCD number given to its Excess-3 equivalent 1001 0011 1000 (2:33)
4. Differentiate between carbon-zinc and alkaline batteries as used in DC circuits (1:25)
5. With the aid of a labelled sketch, outline the schematic symbol for a diode (0:44)
6. Explain two uses of extrinsic semiconductors. (2:11)
7. Determine the binary equivalent of each of the following octal numbers i)147 ii)601 (3:18)
8. Explain two disadvantages of using removable computer storage media (2:21)
9. Sketch a NOR gate equivalent using two NOT gates and an OR gate (1:50)
10. Explain two circumstances of overflows during arithmetic operations of signed binary numbers. (1:40)
11. Outline three types of inductors (0:37)
12. With the aid of sketches, outline one complete wave cycle for each of the following waves. I.Sine II.Square III.Triangle (2:41)
13. Differentiate between conduction band and indirect band gap as used in semiconductors. (3:37)
14. A full adder is a three gate input (A,B and Cin) combination circuit with two outputs (Z,C0) . The first output records that value of the ORed three inputs and the second output records the carry from the ORed inputs. Draw a truth table that will represent the full adder. (7:35)
15. Outline three behavior of valence electrons (0:38)
16. An electrician intends to determine the resistivity of a metal conductor. Explain two quantities that he would require. (1:09)
17. Convert the following binary numbers to their gray code equivalent I. 10111101 II.10010001 (5:30)
18. List six resistor colour codes used to determine the resistance (0:50)
19. Juliet’s computer uses an operating system that is installed on external hard disk. Explain two draw backs of this type of memory. (1:31)
20. Convert the following hexadecimal numbers to their decimal equivalent I.A8ED II.9F07 (5:33)
21. Simplify the following Boolean expression. ABC+ABC’+ABC+AB’C+ABC+A’BC (11:44)
22. List six examples of compact disc (CDs) memory (0:44)
23. During revision, students were asked to provide definition of the following terms. Define each term I.Joule II.Power III.Charge carrier IV.Nucleus (2:30)
24. Explain two circumstances under which integrated circuit (IC’s) could be used in computers. (0:52)
25. Convert the following capacitance values as indicated: I.24nF to F II.0.6uF to F III.770pF to F (4:22)
26. The computer memory continually transforms over time. Explain two challenges of coping with this trend. (1:50)
27. Determine the excess-3 equivalent of the following decimal numbers I.31 II.24 (2:26)
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