KNEC Craft Certificate in ICT module 1 Basic Electronics past paper: November 2017 with video(s) Answers

Watch answers and learn the concepts tested in this paper using recorded videos.

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 advantages of an alkaline battery (1:13)

2.

Determine the decimal equivalent for each of the following number system i)#5763_8# ii)#3C8F_16# (5:43)

3.

A motor gives an output power of 40kW and operates with an efficiency of 80%. When the constant input voltage to the motor is 400V, determine the constant current supply. (4:43)

4.

With aid of a sketch, describe a pure germanium atom. (3:31)

5.

Explain two applications of nibbles in computers. (0:57)

6.

Figure 1 represent a DC series circuit. Determine the current flow, given R1 (10 ohms), R2 (20 ohms) and R3 (30 ohms) and a voltage of 120V. (3:38)

7.

Evaluate each of the following binary arithmetic i)10101 1111 + 10001 1100 ii)#1100xx1101# (6:01)

8.

Explain two types of binary complements (2:39)

9.

Outline three AC wave form characteristics. (1:22)

10.

Differentiate between magnetic tapes and magnetic disks as used in computers. (1:59)

11.

There is a new trend where light emitting diodes are replacing conventional light bulbs in some applications. Explain two reasons for this trend. (1:57)

12.

A student came across the following terms during an electronics class. Explain each of the terms. I) Relay logic II) Integrated circuit (2:01)

13.

Explain two reasons for using DRAM as primary memory in the computer (2:09)

14.

ROM storage media is one of the memories used in making firmware. Explain two advantages of this media (3:05)

15.

Using karnaugh map represent the values of OR gate. (4:06)

16.

Figure 2 represents a sketch of a resistor. Explain the functions of the bands on the resistor labelled I and II. (3:52)

17.

A diode has a power rating of 10W. when the diode voltage is 1.4V and current of 1.75A: I)Determine the power dissipation II)Establish whether the diode will be destroyed (2:26)

18.

A circuit of 6mA flows in a television resistor R when a potential difference of 12V is connected. Determine the: I)Resistance II)Conductance (3:03)

19.

Simplify each of the following decimal number operations, giving your answer in hexadecimal equivalent: i)774 + 869 ii)22,234 – 13, 345 (5:07)

20.

Explain two power sources of DC circuits. (0:21)

21.

Semi-closed fuses are often used in special circuits. Outline three disadvantages of these fuses. (1:14)

22.

Using excess-3, evaluate 811 + 777 , giving the answer in octal. (13:03)

23.

Using reduction techniques, simplify the boolean expression (X+Y)(X+Z) (3:42)

24.

Outline two properties of an atom. (0:49)

25.

Differentiate between NPN transistor and PNP transistor (1:30)

26.

Table 1 represent a truth table for three valves that are controlled by the flow of water. Output = 0, close valve. Use the table to generate the Boolean expression for the output when the valve opens (output = 1). (3:04)

27.

With aid of 3 NAND gates, construct a NOT gate which has two inputs. (3:50)