Armature Winding Theory N2 — Document

November 2022 — N2 — Armature Winding Theory

N2 2022 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 46 items found

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Q1— Section header —

1.1Name TWO main classifications of direct current winding (2\

1.2Define commutation (2\

1.3What is the purpose of mica between the commutator segments? (2\

1.4State Fleming's right hand rule for generators. (3\

1.5How many parallel paths are in a lap winding? (1\

1.6A six pole wave wound armature has 112 slots and 360 segments with a single turn coil

1.6.1The coil span

1.6.2

1.7A direct current machine is connected to a 110 V supply and has an armature resistance of 0, Calculate the back EMF if:

1.7.1The machine runs as a motor taking 65 A

1.7.220

Q2— Section header —

2.1.1Explain the difference between a cumulatively compound wound motor and a differentially compound wound motor. (2

2.1.2

2.2SIX pole lap wound armature is rotated at 800 r in

2.2.1Number of conductors per slot (4\

2.2.2Torque developed by the windings (3\ (11020042 Copyright reserved

2.3Why are equalis ing windings installed? (4\

2.4Name ONE type of a carbon brush. (1\ [20]20

Q3— Section header —

3.1Why is it important to make sure that the load current of a DC machine does not link with the magnetic circuit formed by the shaft and the bedplates of a machine? (3\

3.2Name THREE faults that may develop in an armature winding. (3\

3.3Draw neat diagram to show how a coil is test ed

3.4Draw a neat diagram of a sleeve bearing mounted on a bedplate. (4\

3.5State THREE mechanical defects that would cause a DC machine to fail to start. (3\

3.6State THREE methods of closing slots after windings have been inserted. (3\ [20]20

Q4— Section header —

4.1Determine the following:

4.1.1nductance of the coil in mH (2\

4.1.2

4.1.3Impedance of the circuit (3\

4.1.4Total current flowing in the circuit (2\

4.1.5Voltage drop across each component (3\

4.1.6Draw a phasor diagram of the circuit showing the relationship between the voltages (3\

4.2Draw a neat labelled diagram of an armature. (5\ [20] (1102004220

Q5— Section header —

5.1Name THREE losses that are found in transformers. (3\

5.2Name THREE methods that can be used to cool a transformer. (3\

5.3State FOUR ways in which the armature reaction can be minimis ed (4\

5.4A 150 kVA, 1 000 V/400 V single phase transformer, has 125 turns on the secondary winding. Ignore ALL losses. alculate:

5.4.1The number of primary turns

5.4.2The maximum allowable secondary current

5.4.3The primary current

5.4.4The maximum power if the power factor is 0,866 lagging

5.4.520

Mark Allocation

Total100 marks

Sections20 + 20 + 20 + 20 + 20 = 100 marks

Paper information

TitleDocument

SubjectArmature Winding Theory

LevelN2

Document typeQuestion paper

Year2022

MonthNovember

Pages8

Downloads5

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,438

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File size253.5 KB

Pages8

Archived on8 September 2026

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