KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: July 2019 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.

Describe two types of voltage regulators (0:56)

2.

Figure 1 shows an AC circuit with three resistors R1=5Ὠ, R2 = 8Ὠ, R3 = 7Ὠ and a voltage of 40V. Determine the current in the circuit. (2:57)

3.

Convert the BCD number given to its Excess-3 equivalent 1001 0011 1000 (2:33)

4.

Differentiate between carbon-zinc and alkaline batteries as used in DC circuits (1:25)

5.

With the aid of a labelled sketch, outline the schematic symbol for a diode (0:44)

6.

Explain two uses of extrinsic semiconductors. (2:11)

7.

Determine the binary equivalent of each of the following octal numbers i)147 ii)601 (3:18)

8.

Explain two disadvantages of using removable computer storage media (2:21)

9.

Sketch a NOR gate equivalent using two NOT gates and an OR gate (1:50)

10.

Explain two circumstances of overflows during arithmetic operations of signed binary numbers. (1:40)

11.

Outline three types of inductors (0:35)

12.

With the aid of sketches, outline one complete wave cycle for each of the following waves. I.Sine II.Square III.Triangle (2:42)

13.

Differentiate between conduction band and indirect band gap as used in semiconductors. (3:37)

14.

A full adder is a three gate input (A,B and Cin) combination circuit with two outputs (Z,C0) . The first output records that value of the ORed three inputs and the second output records the carry from the ORed inputs. Draw a truth table that will represent the full adder. (7:37)

15.

Outline three behavior of valence electrons (0:38)

16.

An electrician intends to determine the resistivity of a metal conductor. Explain two quantities that he would require. (1:09)

17.

Convert the following binary numbers to their gray code equivalent I. 10111101 II.10010001 (5:30)

18.

List six resistor colour codes used to determine the resistance (0:50)

19.

Juliet’s computer uses an operating system that is installed on external hard disk. Explain two draw backs of this type of memory. (1:31)

20.

Convert the following hexadecimal numbers to their decimal equivalent I.A8ED II.9F07 (5:33)

21.

Simplify the following Boolean expression. ABC+ABC’+ABC+AB’C+ABC+A’BC (11:44)

22.

List six examples of compact disc (CDs) memory (0:42)

23.

During revision, students were asked to provide definition of the following terms. Define each term I.Joule II.Power III.Charge carrier IV.Nucleus (2:30)

24.

Explain two circumstances under which integrated circuit (IC’s) could be used in computers. (0:52)

25.

Convert the following capacitance values as indicated: I.24nF to F II.0.6uF to F III.770pF to F (4:22)

26.

The computer memory continually transforms over time. Explain two challenges of coping with this trend. (1:50)

27.

Determine the excess-3 equivalent of the following decimal numbers I.31 II.24 (2:26)