Fault Finding And Protective Devices N4 — Document

April 2020 — N4 — Fault Finding And Protective Devices

N4 2020 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 4 pages 📝 35 items found

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Q1— Section header —

1.1Explain the term preventative maintenance (4\

1.2ame and explain the steps in the method collecting facts , keeping in mind the nine poi nt plan in aid of fault finding

1.3Make a sketch of the following symbols:

1.3.1Disconnected junction

1.3.2Mechanical, pneumatic or hydraulic connection

1.3.3Lever operated

1.3.4Breaker contact

1.3.5Link

1.3.616

Q2— Section header —

2.1Make a neat, fully labelled drawing the operation of a direct line starter with start and stop push buttons for a three phase squirrel cage induction motor. (6\

2.2Name the TWO rules that a person should know if he/she wants to become more effective in fault finding techniques. (2\

2.3Name TWO types of overload protection. (2\

2.4For what purpose is insulating material used? (3\ [13]13

Q3— Section header —

3.1Explain the operation of the voltage tester. (5\

3.2Draw a simplified block diagram of an oscilloscope. (5\

3.3Explain why ammeters are low resistance instruments. (3\

3.4What is the purpose of air gaps in steel cores? (2\

3.5Draw NPN transistor showing the correct DC biasing. (4\ [19]19

Q4— Section header —

4.1Draw a full wave bridge rectifier circuit, showing the input and output wave form. (6\

4.2Explain how to test a diode to determine if it is faulty or not (6\

4.3Draw the characteristic curve a silicon diode. (5\

4.4Make a sketch of a diode to show the method that is used to compensate for the Zener diode temperature coeff icient effect during manufacturing. (3\

4.5Name THREE elementary amplifier circuits. (3\ [23]23

Q5— Section header —

5.1How will you know if the circuit of Wheatstone bridge is balance or not?

5.2According to SANS Code 0142, what is the maximum percentage volt drop on cables? (2\

5.3Name SEVEN types of resistors. (7\

5.4State FOUR factors that can increase the failure rate of equipment. [15]15

Q6— Section header —

6.1What can be derived from the following: (A B\A C\ (5\

6.2Draw the logic netwo rk an exclusive OR gate [14] TOTAL14

Mark Allocation

Total100 marks

Sections16 + 13 + 19 + 23 + 15 + 14 = 100 marks

Paper information

TitleDocument

SubjectFault Finding And Protective Devices

LevelN4

Document typeQuestion paper

Year2020

MonthApril

Pages4

Downloads4

Examination context

Decade2020s

Years ago6y

SeasonAutumn (SH)

Start dayWednesday

Exam periodApril 2020

Days since exam2,386

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