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

Watch video answers for November 2021 exam explained in the simplest form.

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.

Define each of the following terms as used in basic electronics: i) Magnitude; ii) Transformer; iii) Load; iv) Electron. (3:12)

2.

Explain each of the following terms as used in basic electronics: i) Error codes; ii) NOT gate. (3:12)

3.

Determine the resistance of each of the following resistor’s colour codes: i) Red, black, green, gold; ii) Purple, green, blue, silver. (8:15)

4.

Using one’s complement, work out #11111000_2-1010111_2# (7:32)

5.

Explain two characteristics of Read Only Memory (ROM). (2:40)

6.

Outline four disadvantages of semiconductor components. (1:07)

7.

Convert the following numbers to their gray code equivalent. i) #71_8# ii) #A3_16# (6:47)

8.

Determine the octal equivalent for each of the following number systems. i) #20.6_16# ii) #139_10# (6:48)

9.

Explain each of the following terms as used in number systems: i) Logical shift; ii) Bitmask. (0:53)

10.

With the aid of a diagram, describe the n-type semiconductors. (7:18)

11.

Evaluate the following octal arithmetic. 64#xx#13 (6:39)

12.

Differentiate between an ohmmeter and a potentiometer. (1:30)

13.

Explain two circumstances that could necessitate the use of a Zener diode in electronic components. (0:44)

14.

Figure 1 show an AC circuit assembled in the laboratory by a technician. Use it to answer the questions that follow. I. State the function of the parts labelled (i) and (ii). II. Explain two applications of the part labelled (i). (2:52)

15.

Outline three challenges in the emerging trends transistors. (1:50)

16.

Convert the following number systems into their hexadecimal equivalent. I) #1761_8 #II) #11010100_2# (5:51)

17.

Draw of a DC circuit of one resistor in series and two resistors in parallel showing the flow of current. (2:22)

18.

Draw a truth table for the following Boolean expression. (23:47)

19.

List four types of resistors. (0:40)

20.

Explain two disadvantages of DRAM used in computers. (3:08)

21.

Draw the logical circuit for the following equation. F=AB+CD+EF+GH (2:47)

22.

Convert the following numbers into their decimal equivalent. I. #F079_16#; II. #1011.11_2# (7:21)

23.

Outline three disadvantages of using floppy disks. (0:56)

24.

Figure 2 is closed circuit with three capacitors C1(40F), C2(20F), C3(10F) and voltage of 50V. Use it to answer the question that follows. Determine voltage across each capacitor. (9:07)

25.

Students in a basic electronics class intend to discuss the factors that would affect the resistance of a wire conductor. Outline three such factors. (2:16)

26.

Using BCD, evaluate. I. #765_10-331_10# II. #27_10+98_10# (14:29)

27.

List six types of DVD used in computers. (0:34)

28.

Simplify the following Boolean algebra. I) (A+B)(A+C) II) AB+A(B+C)+B(B+C) (9:01)

29.

Differentiate between reverse bias and forward bias as used in semiconductor diodes. (2:47)

30.

Explain two circumstances that would necessitate the use of NAND gates in circuits (1:52)