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<=KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: November 2016 with video(s)
Determine the resistance of each of the following resistors.
I. Brown,red,blue,no colour band.
II. Green, violet, white, gold
I. Brown,red,blue,no colour band.
II. Green, violet, white, gold
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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
