KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: July 2018 with video(s) Answers

This paper has answers in both text form and video form for better understanding. All calculations are well explained by the tutor

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 acceptors elements that would form a p-type region when a semiconductor is doped. (4:24)

2.

Draw a closed circuit of three inductors (L1,L2 and L3) in series, showing the current (I) flow and voltage (V1,V2 and V3) across each inductor. (5:52)

3.

Determine the arithmetic operation #345_8 + 43F_16# leaving the answer in decimal equivalent. (9:54)

4.

Explain two characteristics of a Static Random Access Memory (2:57)

5.

Modern computers use ROM in the manufacture of their memories. Explain two primarily uses of ROM (3:16)

6.

Explain two application areas of gray code in computers. (1:03)

7.

Computer designers prefers using hexadecimal number system. State two reasons for this. (1:35)

8.

Define each of the following terms as used in electrical circuits. i)Overcurrent ii)Wattage (1:03)

9.

Calculate each of the following octal arithmetic i)234 – 137 ii)654 + 216 (5:44)

10.

With the aid of a sketch, implement an AND gate with two inputs using NAND logic gates (5:28)

11.

Determine the excess-3 equivalent of each of the following decimal numbers i)147 ii)2543 (3:07)

12.

Outline four examples of the read only memory (1:03)

13.

The rapid development of electronic components has changed the face the electronic world. Explain two emerging trends of such electronic components in the society. (2:16)

14.

Using BCD evaluate 91 + 79 (10:53)

15.

Differentiate between power and energy as used in electrical circuits. (1:46)

16.

Explain two primary bonds that could be found in a semiconductor (1:20)

17.

Differentiate between electrical conductivity and electrical resistivity as used in DC circuits. (1:43)

18.

Figure 1 represents a logic gate. Draw the truth table of the logic gate. (3:12)

19.

Figure 2 represents a closed circuit. Use it to answer the following questions. I)Determine the total resistance in the circuit given that R1 = 10 Ὠ , R2 =60Ὠ , R3 = 50Ὠ and R4 = 40Ὠ II)Describe the flow of the current in the current in the resistors R3 and R4 (9:00)

20.

Table 1 represent a truth table for a logic circuit. Use it to answer the questions that follow. i)Derive the boolean expression for the sum of products ii)Use K-map to simplify the boolean expression (14:29)

21.

Explain three circumstances under which two’s complement is required in computer use. (0:45)

22.

Distinguish between electrode and electrolyte (1:36)

23.

Define impedance as used in electronics (0:27)

24.

Convert the following decimal equivalent to their BCD numbers. I) 598 II) 96.72 (2:30)

25.

Evaluate the binary arithmetic #D_16times3_8# to its octal equivalent. (3:30)

26.

Simplify the boolean function using boolean algebra laws. (10:42)

27.

Outline three disadvantages of integrated circuits. (0:55)

28.

Draw a closed circuit with two batteries and three resistors (R1,R2 and R3) in parallel showing the flow of current. (3:26)

29.

Figure 3 represents an atom structure of an element X. identify the part labelled I,II,III,IV (2:09)

30.

Explain each of the following terms as applied in batteries I) Float charging II) Memory effect (3:00)