Armature Winding Theory N2 — Document

August 2018 — N2 — Armature Winding Theory

N2 2018 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 4 pages 📝 40 items found

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Q1— Section header —

1.1List THREE methods to minimise armature reaction (3\

1.2Why are brushes in DC machines made from carbon instead of steel? (3\

1.3Make a neat labelled sketch of the construction of a DC machine (8\

1.4.1What is the function of a commutator in a DC motor?

1.4.2What is the function of a commutator in a generator? (2 x 2\ (4\ [18]18

Q2— Section header —

2.1A series circuit has a resistance of 12 ohms, an inductive reactance of 30 ohms and a capacitive reactance of 45 ohms, connected to a 220 V/50 Hz supply. Calculate the following:

2.1.1The impedance (2\

2.1.2The current flow (2\

2.1.3The volt drop across the coil (4\

2.1.4Overall power factor (2\

2.1.5Power used in the circuit (2\

2.2.1What is the ideal power factor?

2.2.2Give another term used to refer to ideal power factor. (2 x 1\ (2\ [14]14

Q3— Section header —

3.1Describe the following methods of coil winding:

3.1.1Hand inding

3.1.2Form inding

3.1.3

3.2Explain THREE methods of closing slots after the windings have been inserted. (3\

3.3What is the purpose of mica in the commutator? (2\ [17] 1102004217

Q4— Section header —

4.1Explain in detail the difference between a squirrel cage rotor and a wound rotor (6\

4.2List THREE faults commonly found in rmature coils (3\

4.3How are coil turns accurately determined when recording data before winding? (2\

4.4Explain in detail why the core of a transformer is laminated (3\

4.5What is the purpose of a transformer? (2\

4.6Name and explain the methods used to cool a transformer. (4\ [20]20

Q5— Section header —

5.1Name TWO practical tests that can be conducted on an armature to locate short circuit or open circuit. (2\

5.2List FOUR performance tests that can be conducted on a DC machine (4\

5.3(4\

5.4Explain the terms differentially compounded and cumulatively compounded. (2\ [12]12

Q6— Section header —

6.1When dismantling a motor that has not been opened before, explain the procedure you will follow for the motor to be re assembled correctly. (6\

6.2Give FIVE reasons why a roller bearing wears out. (5\ [11]11

Q7— Section header —

7.1Name THREE types of insulating materials used for slot boxes and caps. (3\

7.2What is heat shrink sleeving and how is it installed? (5\ [8] TOTAL: 100 110200428

Mark Allocation

Total100 marks

Sections18 + 14 + 17 + 20 + 12 + 11 + 8 = 100 marks

Paper information

TitleDocument

SubjectArmature Winding Theory

LevelN2

Document typeQuestion paper

Year2018

MonthAugust

Pages7

Downloads4

Examination context

Decade2010s

Years ago8y

SeasonWinter (SH)

Start dayWednesday

Exam periodAugust 2018

Days since exam2,992

About Armature Winding Theory examination preparation

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File size384 KB

Pages7

Archived on8 September 2026

File age45d

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