KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: November 2016 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. Define each of the following terms as used in computers: a) Memory cell b) Memory wall (2:37)
2. With the aid of a sketch, outline a closed circuit of three resistors in parallel (R1, R2, R3) and a voltage supply Vs. (3:54)
3. Explain two limitations of a BCD number systems. (3:49)
4. Using 1’s complement, evaluate #1000 1001_2 - 1010 1111_2# (9:37)
5. Determine the decimal equivalent for each of the following number systems. a)#BC8_16# b) #101 111_8# (6:22)
6. Explain each of the following terms as used in BCD number systems: a) Most significant bit b) Least significant bit (3:06)
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 (7:33)
8. Calculate each of the following binary arithmetic: a)1000 1110 + 1100 1111 b) 1011 0001 – 1010 1000 (5:09)
9. Draw the truth table for the logic fate in figure 1 (3:40)
10. With aid of a sketch, outline the PN junction diode showing the flow of current and depletion region formation. (2:52)
11. Explain two advantages of DVDs over CD-ROMs. (3:26)
12. Differentiate between photo diode and light emitting diode. (1:47)
13. Determine the BCD equivalent of the following excess-3 code; 1100 1001 1010 1101 (5:36)
14. Determine the resistance of each of the following resistors. I. Brown,red,blue,no colour band. II. Green, violet, white, gold (13:57)
15. Figure 2 shows symbols used for voltage sources. Identify each symbol labelled (i), (ii),(iii), (iv), (v) and (vi) (4:48)
16. Explain two characteristics of a neutron of an atom. (2:54)
17. Using BCD, determine 432 + 357 , giving the answer in excess-3 (7:16)
18. Represent the logic gates in figure 3 using a truth table. (25:59)
19. Figure 4 represents a sawtooth wave generated on a CRT. Based computer screens. Outline the parts labelled (I), (II), (III) and (IV) (2:43)
20. A circuit with a resistance of 40Ὠ is connected to a voltage of 160V. Determine the: (I) Current (A) (II) Conductance (G) (3:11)
21. Simplify each of the following number operations giving your answer in decimal equivalent: (i) #2234_8 + 1567_8# (ii) #2116_8 - 1717_8# (13:05)
22. List four types of capacitors (0:57)
23. Differentiate between magnetic semiconductor and organic semiconductor materials. (1:24)
24. Using k-map. Simplify the function. #sum_ #(3,8,12,13,15) (16:43)
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. (12:03)
26. Outline three domestic DC installations. (0:55)
27. Using the laws of Boolean algebra, evaluate: (6:47)
28. Explain two challenges that could be experienced while using flash memory (2:19)
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 (2:36)
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