047q1s2518 Nc890 Electrical Principes And Practice Qp Supp NCV Level 3 — Document
N/A 2025 — NCV Level 3 — 047q1s2518 Nc890 Electrical Principes And Practice Qp Supp
NCV Level 3
2025
NCV Engineering
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Q1— Section header —
1.1Draw the atomic structure of bromine . It has an atomic number of 35. (4\
1.2The longer the conductor , the greater its resistance. Apart from the length of a conductor, name THREE other factors affecting the resistance of a material. (3\
1.3The field coils of a motor have a resistance of 125 ohms at 20 C. After a run at full loa d, the resistance of the coils ha s increased to 150 ohms. Take the
1.4Explain what is meant by the following fundamental terms used in electricity:
1.4.1Potential difference
1.4.2Electromotive force (2 (4\ [15] QUESTION15
2.1A conductor has an effective length of 150 mm and moves at a constant velocity of 3 m/s perpendicular to a magnetic field of uniform flux density of 0,5 T. Calculate the following:
2.1.1The EMF induced in the conductor
2.1.2
2.2A relay is an electromagnetic device.
2.2.1Explain the purpose of a relay. (2\
2.2.2State FOUR practical applications of a relay (4\ 2. State TWO factors that influence the magnetomotive force (
2.4Calculate the flux density when the flux is 500 Wb and the area is 0,003 m (2\
2.5Two current carrying conductors are placed 2 mm apart and carry a current of 60 A. Calculate the magnitude of the force between these conductors. (2\ 12041003
2.6Complete the following sentence by writing only the missing word or words next to the question number (2.6.1
2.6.4in the ANSWER BOOK. The ampere is the amount of electrical current which, if maintained in two straight (2.6.1 \nductors of infinite length and negligible (2.6.2 and placed (2.6.3 \apart in a vacuum, produces a force of (2.6.4
Q3— Section header —
3.1Name FOUR types of non polarised capacitors. (4\
3.2= 0,5 A 12 V Refer to
3.2.1The total current of the circuit (I (3\
3.2.2The value of the unknown resistor R (6\
3.2.3he t otal current of the circuit when there is a short circuit in a parallel branch (3\
3.3Name TWO ways in which conductors can be connected in a three phase AC supply system. (2
3.4Three inductors of 2 mH, 4 mH and 8 mH are connected in parallel. Calculate the total inductance (3\
3.5State THREE advantages of auto transformers. (3\
3.6Name TWO types of grouping of cells to get the desired EMF. (2\ = 4
3.7Name TWO methods of cooling dry type transformers. (2\
3.8A transformer has a turns ratio of 1:5 and draws a current of 12 A from the supply. Calculate the secondary current. (2\ [30]30
Q4— Section header —
4.1Choose a ite m from COLUMN B that matches a description in COLUMN A. Write only the letter (A F\ next to the question number (4.1.1
4.1.4\in the ANSWER BOOK. COLUMN A COLUMN B .1.1 .1.2
4.1.4Prevents the pointer from oscillating Can only be used for DC measurements Ensures that the deflection shown on the meter is the measured quantity Has a non
4.2Draw a circuit diagram consisting of a voltmeter, ammeter, battery and a load resistor. (4\
4.3Distinguish between an analogue meter and digital meter (2\
4.4Name THREE practical applications of an analogue multimeter. (3\
4.5A moving coil instrument with an internal resistance of 145 ohms gives full scale deflection when a current of 20 mA flows through it. Calculate the value of an additional component required to enable the
Q5— Section header —
5.1Indicate whether the followin g statements are TRUE or FALSE by writing only 'True' or 'F alse' next to the question number 5.
5.1.3\in the ANSWER BOOK.
5.1.1The yoke of a DC machine carries the magnetic flux produced by the poles.
5.1.2The stator provides a magnetic field.
5.1.3
5.2The armature resistance of a DC machine is 0,4 and the generated EMF is 120 V. Calculate the terminal voltage when the machine is used as a:
5.2.1Motor supplying an armature current of 20 A
5.2.2
5.3Name FOUR applications of capacitor start induction run motor. (4\ 5.
5.4.1Direct on line starter
5.4.2
5.5Name TWO types of field coils that are found in a compound generator. (2\
5.6State THREE advantages of a shaded pole induction motor. (3\ [20] TOTAL: 10020
Multiple Choice Options
1C)After a run
Mark Allocation
Total100 marks
Sections15 + 20 + 30 + 15 + 20 = 100 marks
Paper information
TitleDocument
Subject047q1s2518 Nc890 Electrical Principes And Practice Qp Supp
LevelNCV Level 3
Document typeQuestion paper
Year2025
MonthN/A
Pages8
Downloads5
Examination context
Decade2020s
Years ago1y
Season—
Start day—
Exam period—
Days since exam—
About 047q1s2518 Nc890 Electrical Principes And Practice Qp Supp examination preparation
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