Electrical Installation and Maintenance Past Questions for NECO

S6073/S6072 Name:
Examination Number:
ELECTRICAL ___

IIIINSTALLATION &
MAINTENANCE

WORK & II
2 hours

NATIONAL EXAMINATIONS COUNCIL

Senior School Certificate Examination
https://stcharlesedu.com
2 hours

ELECTRICAL INSTALLATION & MAINTENANCE WORK
PAPERS III & II

Do not open this booklet until you are told to do so. While waiting, read the following carefully.

Write your Name and Examination Number in the spaces provided at the top right-hand comer
of this question booklet.

This paper consists of two Papers: III and II.

Answer Paper III on your objective test answer sheet. Instruction on how to do this are given on
the next page. Paper III will last for 40 minutes. On completion of Paper III, the objective test
answer sheet will be collected.

Answer to Paper II are to be written in your answer booklet. Paper II will last for 1 hour.
20 minutes

Do not open Paper II until you are told to do so.

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https://stcharlesedu.com PAPER III

Answer all questions.

Each question is followed by five options lettered A - E. Choose the correct option for each
question and shade in pencil on your answer sheet, the answer space that bears the same letter
as the option you have chosen. Give only one answer to each question and erase completely any
answer you wish to change. Do all your rough work on this question paper.

An example is given below:

Which of these is not part of a ceiling fan?

A. Capacitor
B. Carbon brush
C. Deforestation
D. Copper coil
E. Pole Magnet

The correct option is “Choke” which is lettered C. Therefore, answer space C would be shaded.

[A] [B] [C] [D] [E]

1. Taping a married joint after completion is to
A. add strength to the joint
B. Cause oxidation.
C. Clean t he joint
D. prevent oxidation
E. Protect the joint from tinning

2. The frequency for transmitting electricity in Nigeria is
A. 40 Hz
B. 50 Hz
C. 60 Hz
D. 70 Hz
E. 80 Hz

3. An instrument that can measure both a.c and d.c quantities is based on which of these
principle?
A. Electrostatic principle
B. Moving coil
C. Moving iron
D. Thermocouple
E. Wheatstone bridge

4. In an electrical installation work, E.C.C means
A. Earth Circuit Connector.
B. Earth Concentric Circuit.
C. Earth Concentric Conductor.
D. Earth Continuity Conductor.
E. Electric Connecting Cable.

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https://stcharlesedu.com5. Which of these is a safety precaution in a workshop?
A. Keeping the switches of machine tools in "ON" position after work
B. Undertaking work without supervision
C, Walking bare footed
D. Wearing of loose fitted clothes.
E. Wearing of protective hand gloves

6. Which of the following suitably describes cable rating?
A. Length of run, without joints
B. The cables should be buried underground.
C. The colour of the cable
D. The voltage and current it can carry without burning
E. Whether to be mounted on the wall

7. Taping a married joint after completion is to
A. add strength to the joint
B. Cause oxidation.
C. Clean t he joint
D. prevent oxidation
E. Protect the joint from tinning

8. If an electrical appliance of resistance 20Ω is connected to a 240 V supply, what is the
expected current value?
A. 5A
B. 10A
C. 12A
D. 20A
E. 25A

9. Which of the following is the most suitable rating of plug used for connecting an air
conditioner to the supply?
A. 1A
B. 5A
C. 13A
D. 15A
E. 30A

10. Which of these is a magnetic material?
A. Aluminum
B. Brass alloy
C. Cobalt steel
D. Copper
E. Mahogany wood

11. The following are suitable voltage for transmission except
A. 415V
B. 11KV
C. 32 KV
D. 33KV
E. 132 KV

12. Which of the following is not an insulator?
A. Brass
B. Ceramic
C. Plastic
D. Polyvinyl chloride
E. Vulcanized rubber

https://stcharlesedu.com13. In a d.c circuit, the opposition to the flow of electrical current is
A. capacitance.
B. conductance.
C. inductance.
D. reluctance.
E. resistance.

14. Which of these is not a component used in fixing conduit to the wall?
A. Aluminum clip
B. Crampet
C. Distance saddle
D. Hospital saddle
E. Spacer bar saddle

15. The maximum allowable voltage drop from the point of entry of supply to any point in the
installation is _______
A. 2.0
B. 2.5
C. 5.0
D. 10.0
E. 15.0

16. If the cost of an electric kettle is N400.00, transport on cash is N40.00, selling price is
N500.00. How many pieces must be sold to make a profit of N600.00?
A. 10
B. 20
C. 40
D. 60
E. 80

17. The diagram below represents a/an.

A. aluminium clip
B. cable lug
C. cleat.
D. distance saddle
E. reamer

18. A/an ________ switch is use for varying the intensity of light.
A. dimmer
B. intermediate
C. rotary
D. tumbler.
E. two way

19. Which of these is not a fault in electrical system?
A. Ingress of moisture
B. Line to earth
C. Line to line
D. Open circuit
E. Short circuit

20. Circuit breaker is rated according to its.
A. current carrying capacity.
B. elastic limit.
C. final sub-circuit capacity.
D. frequency hand
E. frequency run.

22. A typical consumer control sequence comprises the following except.
A. circuit breaker
B. cut-out fuse
C. distribution board
D. energy meter
E. freeder pillar

23. The following are electrical accessories except
A. ceiling fan
B. ceiling nose
C. Joint box
D. lamp holder
E. socket outlet

24. In a highly corrosive situation, the beat type of conduct pipe to use is made of ______
material.
A. aluminium conduct
B. heavy gauge steel
C. light gauge steel
D. non alloyed copper
E. zinc alloyed
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S6072 Name: ___
ELECTRICAL Examination Number:
INSTALLATION &
MAINTENANCE

IIWORK

1 hour

NATIONAL EXAMINATIONS COUNCIL

Senior School Certificate Examination
https://stcharlesedu.com
1 hour

ELECTRICAL INSTALLATION & MAINTENANCE WORK
PAPER II

Do not open this booklet until you are told to do so. While you are waiting, read the following
carefully.

Write your Name and Examination Number in the spaces provided at the top right-hand comer
of this booklet.

Answer any four questions only.

Write your answer in blue or black ink in your answer booklet.

© 2021 National Examinations Council

https://stcharlesedu.com PAPER II
Answer any four questions.
All questions carry equal marks
1(a) Calculate the total current in the circuit below

(b) State three methods used for soldering a joint

2(a) State three advantages of an aluminum conduct over steel conduct.
(b) Mention any three points to be considered while determining the size of a conductor for
wiring.
(c) Calculate the resistance of a copper cable 100 m long. if it has cross-sectional area of 50
mm2. The resistivity of a copper is 1.7 Ω/m.

3(a) Mention two differences between lap and wave windings.
(b) List any five causes of accident in the workshop.
(c) Explain the function of a carbon brush used in electric motor.

4(a) Define the term illumination.
(b) A coil of insulated wire of resistance 8 Ω and inductance 0.03 H is connected to an a.c
supply at 240 V, 50 Hz.
Calculate:
(i) current and
(ii) the power.

(c) (i) briefly describe a Trunking System of wiring.
(ii) What is the major advantage a trunking has over conduit system.

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SSCE Exam Questions
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