KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: March 2023 with video(s) Answers

Answers for Basic Electronics past paper: March 2023 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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1.

Outline four disadvantages of an integrated circuit (IC). (4:10)

2.

With aid of a diagram, outline the circuit symbol for a PNP transistor showing the flow of current and voltages (3:29)

3.

Using one’s complement, calculate #11100001_2 - 10101111_2# (15:58)

4.

Draw the truth table for the OR gate (4:46)

5.

Explain two advantages of cache memory in computers. (6:59)

6.

Evaluate the following arithmetic, leaving the answer in octal number system i)#11101100_2 – 10111000_2# ii)#BC_16 + 57_8# (11:31)

7.

With aid of a diagram, outline the electronic configuration of silicon. (2:00)

8.

Determine the excess-3 equivalent for each of the following decimal numbers i)#71.6_10# ii)#945_10# (4:22)

9.

Explain two disadvantages of using hexadecimal number systems (3:09)

10.

Figure 1 represents a closed electric circuit of capacitors C1 (0.6uF), C2(0.3uF), and C3(0.9uF) and a charge of 10 coulombs. Use it to answer the question that follows. Determine the voltage in the circuit. (5:38)

11.

Define each of the following terms as used in basic electronics: I. Energy II. Amplitude III. Power dissipation (3:11)

12.

Explain two characteristics of ROM as used in computers. (5:12)

13.

Using karnaugh map, simplify the minimal terms using the four variables (ABCD) #sum(0,2,8,10,12)# (16:21)

14.

Using BCD, determine #81_10 + 77_10# (6:39)

15.

Outline three regions where a bipolar transistor has the ability to operate. (0:59)

16.

Differentiate between weighted code and nonweighted code as used in BCD number systems. (1:57)

17.

Simplify the decimal number #1- 7/8# , giving your answer in binary notation (5:00)

18.

Figure 2 represents a parallel circuit drawn by a student. Use it to answer the questions that follow. I. Identify the components labelled (I) and (II) II. Explain the behavior voltage across the circuit (2:53)

19.

List six types of diodes. (1:35)

20.

Differentiate forward biasing and reverse biasing of a p-n junction diode. (2:53)

21.

Outline three circumstances under which memory sticks could be used in computers. (1:01)

22.

Outline three uses of the octal number system. (3:02)

23.

Determine the colour code of each of the following carbon composition resistors: I. 13,000,000,000 ohms II. 97,000,000 ohms (3:52)

24.

A student noted types of rheostats in a laboratory while doing an experiment. Outline two such types. (0:30)

25.

Draw the logical gate used for the boolean expression (8:40)

26.

Explain two advantages of using BCD number systems. (1:39)

27.

Figure 3 represent a logic circuit. Use it to answer the question that follows. Draw a truth table for the logic circuit (8:52)

28.

Explain two circumstances that may necessitate the use of a gray code in computers, other than in karnaugh maps. (1:25)

29.

A circuit has a conductance of #4.2 times 10^-2# Siemens and voltage of 10 volts. Determine the current in circuit (4:17)