KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: July 2021 with video(s) Answers

Answers for Basic Electronics past paper: July 2021 with video(s)

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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Outline four application areas of Gray code number systems. (2:42)

Explain each of the following terms used in basic electronics: i)Logic gate ii) 8421 BCD (8:16)

With aid of a sketch, describe a photodiode as used in electronics. (1:45)

Determine the hexadecimal equivalent of the following number systems. i)#1001111111101000_2# ii) #0.6640625_10# (10:40)

Describe two physical parts of an internal computer hard disk (2:09)

Differentiate between a donor and acceptor atoms as applied in semiconductors. (3:37)

Define each of the following terms as used in basic electronics: i)Neutron ii)Conductivity iii)Inductance iv) Impedance (4:10)

Determine the decimal equivalent of each of the following numbers. i) #756_8# ii) #89.4_16# (9:36)

Figure 1 represents a close electrical circuit. Use it to answer the question that follows: Explain the function of the parts labelled (i) and (ii) (3:00)

10.

Explain two advantages of excess-3 code. (4:59)

11.

With the aid of a diagram, describe the depletion layer of a p-n junction. (3:06)

12.

Distinguish between energy and power as used in electronics. (1:30)

13.

Outline three circumstances that would necessitate the use of inductors in electrical circuits. (2:49)

14.

Evaluate each of the following numbers, show your working. I. #1000 1111_2 + 10101111_2# II. #1011_2 × 1010_2# (9:21)

15.

Employees of a certain company were asked to discuss the trends of computer memory since the fourth generation of computers. Outline three such trends. (4:02)

16.

Calculate each of the following octal arithmetic I.134 + 654 II. 2712 - 1517 (9:57)

17.

A student intends to determine the factors that affect the resistance of a conductor. Explain two such factors. (3:09)

18.

Draw a logic circuit for the following boolean equation (8:01)

19.

Outline three disadvantages of using flash memory. (2:04)

20.

A cable of length 4 kilometers has a cross-sectional area of #2 × 10-6m^2# and conductivity of #8 × 10^-6# S/m. determine the resistance of the cable. (6:09)

21.

Figure 2 represent a closed circuit with three resistors of R1(10 Ὠ), R2(15Ὠ), R3(12Ὠ) and a current of 20A. use it to answer the question that follows. Determine the total voltage across the circuit. (4:33)

22.

Calculate 456 + 891 using BCD arithmetic. (8:59)

23.

List four types of capacitors. (1:33)

24.

Explain the following terms as used in computer storage I.byte II. density (1:50)

25.

Expand the general expression to Sum of product form (12:08)

26.

Convert each of the following number systems into their octal equivalent I. #617_16# II. #109_10# (5:58)

27.

Outline three application areas of holographic memory in computers. (1:39)

28.

Explain two circumstances that would necessitate the use of PNP transistors. (2:55)

29.

Draw the symbols for each of the following as used in electricity: I. Battery II. Open switch III. Potentiometer (4:14)