WAEC Electrical Installation Essay & Obj Answer 2024

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ELECTRICAL INSTALLATION
01-10: AADACCABAB
11-20: BBCADACCAA
21-30: BADACABBDA
31-40: ACACABBACA

*ELECTRICAL INSTALLATION*

*ELECTRICAL NUMBER 1*

A(ii) Three requirements for the registration of an electrical installation business:

1. Licensing: Obtain a valid electrical contractor’s license from the relevant state or local authorities.
2. Insurance: Have appropriate liability insurance and workers’ compensation insurance to cover employees and customers.
3. Certification: Obtain necessary certifications, such as ISO 9001 (quality management) and OHSAS 18001 (occupational health and safety).

B) Five safety rules to observe in an electrical workshop:
1. Wear appropriate personal protective equipment (PPE) like gloves, safety glasses, and a hard hat.
2. Ensure all electrical equipment and tools are regularly inspected and maintained.
3. Keep the workspace clean, tidy, and free from clutter and tripping hazards.
4. Use appropriate lockout/tagout procedures when working on electrical equipment.
5. Follow safe working practices, such as de-energizing circuits before starting work.

C) Five steps to administer respiration to resuscitate an electrician who experienced an electric shock:
1. Call for emergency medical services (EMS) or alert someone nearby to do so.
2. Check the electrician’s airway, breathing, and circulation (ABCs) and ensure they are unresponsive.
3. Start cardiopulmonary resuscitation (CPR) by giving 30 chest compressions.
4. Give two rescue breaths, each lasting about one second.
5. Continue CPR until EMS arrives or the electrician regains consciousness.

(2a)
(i) Lead dioxide (PbO2)
(ii) sponge lead (Pb)
(iii) sulfuric acid (H2SO4).

(2aii)
(i) Local action: Occurs when impurities in the lead plate react with the electrolyte, causing self-discharge and reducing battery capacity.

(ii) Polarization: Happens when hydrogen gas bubbles form on the negative plate, hindering the chemical reaction and reducing battery efficiency.

(2aiii)
(i) Low voltage output.
(ii) Diminished electrolyte level.
(iii) Reduced specific gravity of the electrolyte.

(2b)
(2bi) Parts of a high breaking capacity fuse:
(i) Fuse element
(ii) Fuse holder

(2bii)
(i) Enhanced safety by quickly interrupting high fault currents, preventing damage to equipment and potential hazards.
(ii) Increased reliability by effectively protecting electrical circuits from overcurrent conditions.
(iii) Versatility in various applications due to the ability to handle high fault currents without nuisance tripping.