Fault Finding And Protective Devices N5 — Document

August 2019 — N5 — Fault Finding And Protective Devices

N5 2019 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 8 pages 📝 39 items found

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Q1— Section header —

Q3— Section header —

3.1During the conversio n of energy from one form to another, energy is lost. Name THREE categories of energy loss that can occur in DC machine

3.2Name TWO direct tests done on an electrical motor to determine the losses. (2\

3.3Name TWO indirect tests done on an electrical motor to determine the losses. (2\

3.4Give THREE reasons why three phase induction motors are the most commonly used in industry. (3\ [10]10

Q4— Section header —

4.1Dra w a simple sketch to show the construction of artindale instrument. (6\

4.2Explain the purpose of the following test done on electrical machines:

4.2.1Polarity test

4.2.210

Q5— Section header —

5.1The FIGURE below shows circle diagram of three phase induction motor. Name what each line represents by writing only the answer next to the

5.1.6in the ANSWER BOOK xample

5.1.7\hort circuit stator current.

5.2Dynamic braking is the method used to slow down motor before applying mechanical brakes. State FOUR requirements for dynamic braking. (4\ [10]10

Q6— Section header —

6.1A CR T has its screen 300 mm from the center of the deflect ing plates that are 25 mm long and 42 mm apart. The beam voltage is 1 kV and the deflecting voltage is 15 V. Determine the deflection on the screen.

6.2State THREE factors that influence the defl ection sensitivity in a cathode ray tube. (3\

6.3Give THREE uses of a cathode ray oscilloscope. (3\ [10]10

Q7— Section header —

7.1Draw a neat labelled characteristic curve of an SCR. (6\

7.2Define the term holding current (2\

7.3State TWO methods used to switch off an SCR in SCR circuit (2\ [10]10

Q8— Section header —

8.1State FOUR functions of a register. (4\

8.2How many flip flops are required to construct a shift register that is capable of storing a six bit binary number? (2\

8.3evelop a truth table for the R flip flop. (4\ [10]10

Q9— Section header —

9.1How many possibilities exist for the truth table of a two input OR gate? (1\

9.2Draw the switching circuit of an NOR gate using two inputs. (3\

9.3Study the following IEC symbols of a logic gate and give the name of each gate:

9.3.310

Q10— Section header —

10.11011100, 100 (10\

10.2(2\

10.33BF, A (2\

10.41010001,001 (10\

10.510

Mark Allocation

Total100 marks

Sections10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 = 100 marks

Paper information

TitleDocument

SubjectFault Finding And Protective Devices

LevelN5

Document typeQuestion paper

Year2019

MonthAugust

Pages8

Downloads6

Examination context

Decade2010s

Years ago7y

SeasonWinter (SH)

Start dayThursday

Exam periodAugust 2019

Days since exam2,628

About Fault Finding And Protective Devices examination preparation

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File size299.2 KB

Pages8

Archived on8 September 2026

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