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<=KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: November 2016 with video(s)
The curtains in a house is controlled by four light inlets W, X, Y, and Z. The curtains are drawn up
whenever W and X are in different positions. When Y is low, the curtain is drawn up, on condition that Z is
high. Draw a truth table to represent this information.
whenever W and X are in different positions. When Y is low, the curtain is drawn up, on condition that Z is
high. Draw a truth table to represent this information.
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Questions List:
1. Define each of the following terms as used in computers: a) Memory cell b) Memory wall
2. With the aid of a sketch, outline a closed circuit of three resistors in parallel (R1, R2, R3) and a voltage supply Vs.
3. Explain two limitations of a BCD number systems.
4. Using 1’s complement, evaluate #1000 1001_2 - 1010 1111_2#
5. Determine the decimal equivalent for each of the following number systems. a)#BC8_16# b) #101 111_8#
6. Explain each of the following terms as used in BCD number systems: a) Most significant bit b) Least significant bit
7. A conductor wire of length 24m has a resistance of 16 and conductivity of #3.2 times 10 Ὠ^-1 m^-1#. The cross sectional area of a conductor wire is #3.2 x 10^-2# . resistivity of #4.0 times 10^-4 Ὠm# and resistance of #8.0 times 10^-2# Ὠ. Determine the: a) Conductivity of the wire b) Length of the wire in m
8. Calculate each of the following binary arithmetic: a)1000 1110 + 1100 1111 b) 1011 0001 – 1010 1000
9. Draw the truth table for the logic fate in figure 1
10. With aid of a sketch, outline the PN junction diode showing the flow of current and depletion region formation.
11. Explain two advantages of DVDs over CD-ROMs.
12. Differentiate between photo diode and light emitting diode.
13. Determine the BCD equivalent of the following excess-3 code; 1100 1001 1010 1101
14. Determine the resistance of each of the following resistors. I. Brown,red,blue,no colour band. II. Green, violet, white, gold
15. Figure 2 shows symbols used for voltage sources. Identify each symbol labelled (i), (ii),(iii), (iv), (v) and (vi)
16. Explain two characteristics of a neutron of an atom.
17. Using BCD, determine 432 + 357 , giving the answer in excess-3
18. Represent the logic gates in figure 3 using a truth table.
19. Figure 4 represents a sawtooth wave generated on a CRT. Based computer screens. Outline the parts labelled (I), (II), (III) and (IV)
20. A circuit with a resistance of 40Ὠ is connected to a voltage of 160V. Determine the: (I) Current (A) (II) Conductance (G)
21. Simplify each of the following number operations giving your answer in decimal equivalent: (i) #2234_8 + 1567_8# (ii) #2116_8 - 1717_8#
22. List four types of capacitors
23. Differentiate between magnetic semiconductor and organic semiconductor materials.
24. Using k-map. Simplify the function. #sum_ #(3,8,12,13,15)
25. The curtains in a house is controlled by four light inlets W, X, Y, and Z. The curtains are drawn up whenever W and X are in different positions. When Y is low, the curtain is drawn up, on condition that Z is high. Draw a truth table to represent this information.
26. Outline three domestic DC installations.
27. Using the laws of Boolean algebra, evaluate:
28. Explain two challenges that could be experienced while using flash memory
29. With aid of sketches in each case. Outline the symbols of each of the following resistors: (i) Fixed resistor (ii) Variable resistor (iii) Rheostat (iv) potentiometer
1. Define each of the following terms as used in computers: a) Memory cell b) Memory wall
2. With the aid of a sketch, outline a closed circuit of three resistors in parallel (R1, R2, R3) and a voltage supply Vs.
3. Explain two limitations of a BCD number systems.
4. Using 1’s complement, evaluate #1000 1001_2 - 1010 1111_2#
5. Determine the decimal equivalent for each of the following number systems. a)#BC8_16# b) #101 111_8#
6. Explain each of the following terms as used in BCD number systems: a) Most significant bit b) Least significant bit
7. A conductor wire of length 24m has a resistance of 16 and conductivity of #3.2 times 10 Ὠ^-1 m^-1#. The cross sectional area of a conductor wire is #3.2 x 10^-2# . resistivity of #4.0 times 10^-4 Ὠm# and resistance of #8.0 times 10^-2# Ὠ. Determine the: a) Conductivity of the wire b) Length of the wire in m
8. Calculate each of the following binary arithmetic: a)1000 1110 + 1100 1111 b) 1011 0001 – 1010 1000
9. Draw the truth table for the logic fate in figure 1
10. With aid of a sketch, outline the PN junction diode showing the flow of current and depletion region formation.
11. Explain two advantages of DVDs over CD-ROMs.
12. Differentiate between photo diode and light emitting diode.
13. Determine the BCD equivalent of the following excess-3 code; 1100 1001 1010 1101
14. Determine the resistance of each of the following resistors. I. Brown,red,blue,no colour band. II. Green, violet, white, gold
15. Figure 2 shows symbols used for voltage sources. Identify each symbol labelled (i), (ii),(iii), (iv), (v) and (vi)
16. Explain two characteristics of a neutron of an atom.
17. Using BCD, determine 432 + 357 , giving the answer in excess-3
18. Represent the logic gates in figure 3 using a truth table.
19. Figure 4 represents a sawtooth wave generated on a CRT. Based computer screens. Outline the parts labelled (I), (II), (III) and (IV)
20. A circuit with a resistance of 40Ὠ is connected to a voltage of 160V. Determine the: (I) Current (A) (II) Conductance (G)
21. Simplify each of the following number operations giving your answer in decimal equivalent: (i) #2234_8 + 1567_8# (ii) #2116_8 - 1717_8#
22. List four types of capacitors
23. Differentiate between magnetic semiconductor and organic semiconductor materials.
24. Using k-map. Simplify the function. #sum_ #(3,8,12,13,15)
25. The curtains in a house is controlled by four light inlets W, X, Y, and Z. The curtains are drawn up whenever W and X are in different positions. When Y is low, the curtain is drawn up, on condition that Z is high. Draw a truth table to represent this information.
26. Outline three domestic DC installations.
27. Using the laws of Boolean algebra, evaluate:
28. Explain two challenges that could be experienced while using flash memory
29. With aid of sketches in each case. Outline the symbols of each of the following resistors: (i) Fixed resistor (ii) Variable resistor (iii) Rheostat (iv) potentiometer
