KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: November 2015 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. Outline four sources of energy that could be used in the society (3:10)
2. With the aid of a sketch,outline variable capacitor symbols. (2:11)
3. Explain two disadvantages of BCD in comparison to binary number system. (4:33)
4. Determine the hexadecimal equivalent for each of the following number systems i)#572_8# ii)#10001 1111_2# (5:44)
5. Calculate each of the following octal arithmetic i) 453+444 ii) 765-301 (4:06)
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 (5:01)
7. Explain two standard sign values for packed BCD used in computers. (2:42)
8. Using ones’ complement determine : #1111 1001_2 – 1110 1000_2# (6:40)
9. Bipolar transistors have distinct regions of operation. Outline four of these regions defined by junction biases. (2:08)
10. Draw the truth table for an exclusive OR gate (XOR) gate (4:56)
11. Explain two disadvantages of flash memory as used in computers. (3:01)
12. Differentiate between asynchronous and synchronous as a character of static RAM. (2:35)
13. Determine the BCD equivalent of: #1100 1111 1010 1001_2# (7:05)
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. (3:43)
15. Outline three components that should be included in a DC circuit. (2:06)
16. Explain two functions of the neutron in an atom. (1:57)
17. Using BCD, determine 342 + 213, giving the answer in excess-3 code. (5:03)
18. Figure 1 shows an arrangement of logical gates. Construct a truth table showing the outputs R,S and T. (24:49)
19. With the aid of sketches, outline four wave waveform shapes used in signals. (2:09)
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) (3:49)
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 (8:02)
22. State four applications of diode in the society, other than in logic gates (3:43)
23. Differentiate between N-type and P-type semiconductor materials. (3:01)
24. Using laws of boolean algebra, evaluate. (4:10)
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# (6:04)
26. Outline three uses of extrinsic semiconductors. (2:00)
27. Using the K-map, simplify the function #sum_#m (0,2,8,10) (13:12)
28. Improper management of memory is a common cause of bugs. Outline three such types of bugs. (1:55)
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. (6:05)
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