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<= KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: November 2015 with video(s)
Lights in a room are controlled by three windows M, N and O. the light enters whenever windows M, N
and O are in different positions. When M and O are in same positions,light enters on condition that
window N is high. Draw a truth table to represent the information.
and O are in different positions. When M and O are in same positions,light enters on condition that
window N is high. Draw a truth table to represent the information.
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Questions List:
1. Outline four sources of energy that could be used in the society
2. With the aid of a sketch,outline variable capacitor symbols.
3. Explain two disadvantages of BCD in comparison to binary number system.
4. Determine the hexadecimal equivalent for each of the following number systems i)#572_8# ii)#10001 1111_2#
5. Calculate each of the following octal arithmetic i) 453+444 ii) 765-301
6. A conductor wire of length 24m has a resistivity of #8xx10^-4# Ὠm and cross sectional area of #1.6 xx 10^-2 m^2# . determine the : i)resistance of the wire in Ὠ ii)Conductivity of the wire
7. Explain two standard sign values for packed BCD used in computers.
8. Using ones’ complement determine : #1111 1001_2 – 1110 1000_2#
9. Bipolar transistors have distinct regions of operation. Outline four of these regions defined by junction biases.
10. Draw the truth table for an exclusive OR gate (XOR) gate
11. Explain two disadvantages of flash memory as used in computers.
12. Differentiate between asynchronous and synchronous as a character of static RAM.
13. Determine the BCD equivalent of: #1100 1111 1010 1001_2#
14. A potential difference of 10V is connected to a uniform resistance wire of length 0.4m and cross sectional of #16xx10^-8 m^2# with resistivity of #3.2 xx 10 ^-6# Ὠm. Determine the current flowing through the wire.
15. Outline three components that should be included in a DC circuit.
16. Explain two functions of the neutron in an atom.
17. Using BCD, determine 342 + 213, giving the answer in excess-3 code.
18. Figure 1 shows an arrangement of logical gates. Construct a truth table showing the outputs R,S and T.
19. With the aid of sketches, outline four wave waveform shapes used in signals.
20. A current of 80A is connected to a voltage of 16V determine the: I. Resistor R (Ὠ) II. Power in R in W (micro watts)
21. Simplify each of the following binary arithmetic operations giving your answer in decimal equivalent: i). 1001 000 + 0100 1101 ii) 1111 0100 – 1100 0001
22. State four applications of diode in the society, other than in logic gates
23. Differentiate between N-type and P-type semiconductor materials.
24. Using laws of boolean algebra, evaluate.
25. Figure 2 shows a simple electric circuit with four resistors of resistance R1 (8Ὠ), R2 (6Ὠ), R3 (4Ὠ), and R4 (8Ὠ) and voltage of 80V. determine the supply current #I_1#
26. Outline three uses of extrinsic semiconductors.
27. Using the K-map, simplify the function #sum_#m (0,2,8,10)
28. Improper management of memory is a common cause of bugs. Outline three such types of bugs.
29. Lights in a room are controlled by three windows M, N and O. the light enters whenever windows M, N and O are in different positions. When M and O are in same positions,light enters on condition that window N is high. Draw a truth table to represent the information.
1. Outline four sources of energy that could be used in the society
2. With the aid of a sketch,outline variable capacitor symbols.
3. Explain two disadvantages of BCD in comparison to binary number system.
4. Determine the hexadecimal equivalent for each of the following number systems i)#572_8# ii)#10001 1111_2#
5. Calculate each of the following octal arithmetic i) 453+444 ii) 765-301
6. A conductor wire of length 24m has a resistivity of #8xx10^-4# Ὠm and cross sectional area of #1.6 xx 10^-2 m^2# . determine the : i)resistance of the wire in Ὠ ii)Conductivity of the wire
7. Explain two standard sign values for packed BCD used in computers.
8. Using ones’ complement determine : #1111 1001_2 – 1110 1000_2#
9. Bipolar transistors have distinct regions of operation. Outline four of these regions defined by junction biases.
10. Draw the truth table for an exclusive OR gate (XOR) gate
11. Explain two disadvantages of flash memory as used in computers.
12. Differentiate between asynchronous and synchronous as a character of static RAM.
13. Determine the BCD equivalent of: #1100 1111 1010 1001_2#
14. A potential difference of 10V is connected to a uniform resistance wire of length 0.4m and cross sectional of #16xx10^-8 m^2# with resistivity of #3.2 xx 10 ^-6# Ὠm. Determine the current flowing through the wire.
15. Outline three components that should be included in a DC circuit.
16. Explain two functions of the neutron in an atom.
17. Using BCD, determine 342 + 213, giving the answer in excess-3 code.
18. Figure 1 shows an arrangement of logical gates. Construct a truth table showing the outputs R,S and T.
19. With the aid of sketches, outline four wave waveform shapes used in signals.
20. A current of 80A is connected to a voltage of 16V determine the: I. Resistor R (Ὠ) II. Power in R in W (micro watts)
21. Simplify each of the following binary arithmetic operations giving your answer in decimal equivalent: i). 1001 000 + 0100 1101 ii) 1111 0100 – 1100 0001
22. State four applications of diode in the society, other than in logic gates
23. Differentiate between N-type and P-type semiconductor materials.
24. Using laws of boolean algebra, evaluate.
25. Figure 2 shows a simple electric circuit with four resistors of resistance R1 (8Ὠ), R2 (6Ὠ), R3 (4Ὠ), and R4 (8Ὠ) and voltage of 80V. determine the supply current #I_1#
26. Outline three uses of extrinsic semiconductors.
27. Using the K-map, simplify the function #sum_#m (0,2,8,10)
28. Improper management of memory is a common cause of bugs. Outline three such types of bugs.
29. Lights in a room are controlled by three windows M, N and O. the light enters whenever windows M, N and O are in different positions. When M and O are in same positions,light enters on condition that window N is high. Draw a truth table to represent the information.
