Fault Finding And Protective Devices N5 — Document

August 2018 — N5 — Fault Finding And Protective Devices

N5 2018 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 36 items found

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Q2— Section header —

Q3— Section header —

3.1Briefly describe the following parts of a DC motor:

3.1.1Armature

3.1.2Brush holders

3.1.3

3.2Make a labelled drawing of a direct current motor to test the polarity of the field by means of a nail. Clearly show the position of the nail with the right and wrong polarity. (4\ [10]10

Q4— Section header —

4.1Name TWO variable losses in DC machines. (2\

4.2Name THREE types of constant losses in a DC series motor. (3\

4.3Name THREE main losses in a DC shunt motor under load. (3\

4.4Name TWO types of brushes that are used in DC machines. (2\ [10]10

Q5— Section header —

5.1Dynamic breaking is the method used to slow down AC and DC motor before applying mechanical brakes. Briefly explain how DC injection is applied in AC motors to slow down the motor. (3\

5.2Calculate the value of the dynamic breaking resistor needed to cause maximum breaking effort to a 30 kW, 220V DC motor. (5\

5.3Give TWO examples where inching circuit is used. (2\ [10]10

Q6— Section header —

6.1Draw a diagram of a positive series voltage regulator. (5\

6.2Draw a diagram of a negative series voltage regulator. (5\ [10]10

Q7— Section header —

7.1What is an X Y plotter? (2\

7.2Name SIX special features of the X Y plotter. (6\

7.3Briefly explain the function of the self balancing potentiometer used in plotter.

Q8— Section header —

8.1Define the following terms as applied to operational amplifiers:

8.1.1Open loop

8.1.2Closed loop

8.1.3Positive feedback

8.1.4

8.2Name TWO advantages of an operational amplifier. (2\ [10]10

Q9— Section header —

9.1Name TWO types of flip flops. (2\

9.2Draw the truth tables of NAND gate and NOR gate function with TWO inputs of each. (8\ [10]10

Q10— Section header —

10.1110010, 101 (10\ .2 79 10 (2\ 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

Year2018

MonthAugust

Pages6

Downloads5

Examination context

Decade2010s

Years ago8y

SeasonWinter (SH)

Start dayWednesday

Exam periodAugust 2018

Days since exam2,994

About Fault Finding And Protective Devices examination preparation

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For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

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A practical revision approach

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