Fault Finding And Protective Devices N4 — Document

November 2022 — N4 — Fault Finding And Protective Devices

N4 2022 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 4 pages 📝 37 items found

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Q1— Section header —

1.1Why was the nine point plan designed? (2

1.2State the THREE best action to be taken when considering implementing new decisions

1.3Name TWO rules that a person should know if he/she wants to become more effective in fault finding techniques. (2\

1.4Explain the term preventative maintenance (4\ [14]14

Q2— Section header —

2.1Draw a three phase star/ delta automatic control circuit. (8\

2.2Give TWO reasons why a moving coil instrument can be used in DC supply

2.3Answer the fo llowing with reference to fault finding techniques:

2.3.1Name FIVE aids concerning the documentation of fault finding. (5\

2.3.2Name FOUR methods used in the systematic method of fault finding. (4\

2.4Draw up an action/reaction table of the circuit on the DIAGRAM SHEET (attached\ (8\ [29]29

Q3— Section header —

3.1A technician is concerned with detecting a fault and repairing the fault State the NINE basic rules which the technician mu st apply to be more effective

3.2Draw TWO circuit diagram showing the current methods of connecting an ammeter

3.3Explain how to test a diode to determine if it is faulty or not (4\

3.4Explain what the capacity of a conductor means (3\

3.5Draw a graph to show what happens to the dielectric strength of polythene when the thickness of the insulating material is increased. (4\ [24] (8080104\24

Q4— Section header —

4.1Explain forced commutation of SCRs. (2\

4.2What is the purpose of air gaps in steel cores? (2\

4.3Define the unit ohm (3\

4.4State ONE function of the time base generator of the oscilloscope. (2\

4.5Explain how eddy currents can be minimised in coils of transformers. (3\ [12] QUSTION 512

5.1Give TWO applications of silicon control rectifier. (2\

5.2Draw a diode to show the method that is used to compensate for the Zener diode temperature coefficient effect during manufacturing. (3\

5.3Name the type of amplification obtained in each of the following amplifying circuits:

5.3.1Common emitter circuit

5.3.2Common collector circuit

5.3.3Common base circuit (3 1\ (3\ [8]8

Q6— Section header —

6.1Draw the symbol of an AND gate with TWO inputs. (2\

6.2Complete the following laws and identities of Boolean algebra:

6.2.1A + AB

6.2.2A + AB

6.2.3

6.3Design a logic circuit to fit the expression Q = (A + C\B + C\ (A + B\ (5\ [13] TOTAL: 100 (8080104\ Copyright reserved13

Mark Allocation

Total100 marks

Sections14 + 29 + 24 + 12 + 8 + 13 = 100 marks

Paper information

TitleDocument

SubjectFault Finding And Protective Devices

LevelN4

Document typeQuestion paper

Year2022

MonthNovember

Pages5

Downloads3

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,441

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