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<=KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: July 2019 with video(s)
Simplify the following Boolean expression.
ABC+ABC’+ABC+AB’C+ABC+A’BC
ABC+ABC’+ABC+AB’C+ABC+A’BC
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Questions List:
1. Describe two types of voltage regulators
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.
3. Convert the BCD number given to its Excess-3 equivalent 1001 0011 1000
4. Differentiate between carbon-zinc and alkaline batteries as used in DC circuits
5. With the aid of a labelled sketch, outline the schematic symbol for a diode
6. Explain two uses of extrinsic semiconductors.
7. Determine the binary equivalent of each of the following octal numbers i)147 ii)601
8. Explain two disadvantages of using removable computer storage media
9. Sketch a NOR gate equivalent using two NOT gates and an OR gate
10. Explain two circumstances of overflows during arithmetic operations of signed binary numbers.
11. Outline three types of inductors
12. With the aid of sketches, outline one complete wave cycle for each of the following waves. I.Sine II.Square III.Triangle
13. Differentiate between conduction band and indirect band gap as used in semiconductors.
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.
15. Outline three behavior of valence electrons
16. An electrician intends to determine the resistivity of a metal conductor. Explain two quantities that he would require.
17. Convert the following binary numbers to their gray code equivalent I. 10111101 II.10010001
18. List six resistor colour codes used to determine the resistance
19. Juliet’s computer uses an operating system that is installed on external hard disk. Explain two draw backs of this type of memory.
20. Convert the following hexadecimal numbers to their decimal equivalent I.A8ED II.9F07
21. Simplify the following Boolean expression. ABC+ABC’+ABC+AB’C+ABC+A’BC
22. List six examples of compact disc (CDs) memory
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
24. Explain two circumstances under which integrated circuit (IC’s) could be used in computers.
25. Convert the following capacitance values as indicated: I.24nF to F II.0.6uF to F III.770pF to F
26. The computer memory continually transforms over time. Explain two challenges of coping with this trend.
27. Determine the excess-3 equivalent of the following decimal numbers I.31 II.24
1. Describe two types of voltage regulators
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.
3. Convert the BCD number given to its Excess-3 equivalent 1001 0011 1000
4. Differentiate between carbon-zinc and alkaline batteries as used in DC circuits
5. With the aid of a labelled sketch, outline the schematic symbol for a diode
6. Explain two uses of extrinsic semiconductors.
7. Determine the binary equivalent of each of the following octal numbers i)147 ii)601
8. Explain two disadvantages of using removable computer storage media
9. Sketch a NOR gate equivalent using two NOT gates and an OR gate
10. Explain two circumstances of overflows during arithmetic operations of signed binary numbers.
11. Outline three types of inductors
12. With the aid of sketches, outline one complete wave cycle for each of the following waves. I.Sine II.Square III.Triangle
13. Differentiate between conduction band and indirect band gap as used in semiconductors.
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.
15. Outline three behavior of valence electrons
16. An electrician intends to determine the resistivity of a metal conductor. Explain two quantities that he would require.
17. Convert the following binary numbers to their gray code equivalent I. 10111101 II.10010001
18. List six resistor colour codes used to determine the resistance
19. Juliet’s computer uses an operating system that is installed on external hard disk. Explain two draw backs of this type of memory.
20. Convert the following hexadecimal numbers to their decimal equivalent I.A8ED II.9F07
21. Simplify the following Boolean expression. ABC+ABC’+ABC+AB’C+ABC+A’BC
22. List six examples of compact disc (CDs) memory
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
24. Explain two circumstances under which integrated circuit (IC’s) could be used in computers.
25. Convert the following capacitance values as indicated: I.24nF to F II.0.6uF to F III.770pF to F
26. The computer memory continually transforms over time. Explain two challenges of coping with this trend.
27. Determine the excess-3 equivalent of the following decimal numbers I.31 II.24
