SOLVED PAST QUESTION ON EEC 226 [ ELECTRICAL MAINTENANCE AND REPAIR]

ENUMERATE 5 (FIVE) MAINTENANCE PROCESSES OF ELECTRIC KETTLE (5 marks)

1. Never connect empty kettle to mains supply. Put enough water.
2. At the time of repairing, disconnect it from main supply.
3. When using water must not enter because short circuit, earth or leakage fault may occur.
4. Avoid using broken cord or naked cord connected.
5. Endeavor electric kettle is put off,
   when it job is completed.

STATE THREE [3] PRECAUTION TO BE TAKEN WHEN REPLACING CAPACITOR IN A CIRCUIT.

1. Be sure the new leads are the same length with as the old ones.
2. Use a heat sink between the capacitor and the soldered joint.
3. Install capacitor of the specified voltage rating or a higher voltage rating, installing a lower rating is asking for trouble.
4. Make sure the new capacitors is soldered in places in the same way as the old ones when installed.

MENTION SIX [6] STEPS INVOLVED IN SOLDERING TECHNIQUES

1. Tin the strands
2. Do not put the solder directly on the soldering iron.
3. Remove or withraw the solder or iron
   D. List three (3) types of electric fans
4. D.C table fans or ceiling fans
5. A.C table fans or ceiling fans.
6. D.C/ A.C table fans or ceiling fans.

MENTION FOUR (4) CAUSES THAT RENDER TRANSFORMER OIL UNSUITABLE FOR FURTHER USE [4 MARKS]

1. Low electric strength – may result from many causes, the most common is foreign particles on fiber and water in combination.
2. High acidity
3. High sludge content
4. Excessive free water content – presence of moisture can be detected with oil dryness test set.

Next topic to be discussed

DESCRIBE FOUR MAIN FEATURES OF AN OSCILLOSCOPE✓. [4 MARKS]

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