Common faults in table fan, their causes and repair. (4 marks)
ANSWER
(1) Open, short, earth or leakage fault in the windings, capacitors and regulators.
Correction: check them with series test lamp separately and remove the defects if possible.
(2) Blades rotate slowly and motor is heated up
Correction: Test the windings and cap with test lamp.
→ oil the brushes.
→ set the angle of blades.
(3) fan is giving noise
Correction: Blades angle may be defective so dry brushes. Shaft of rotor may be bent or loose shaft.
(4) Fan body isn’t revolving
Correction: check the gears and oscillating rod and replaced them.
Explain briefly the working Principle of a transformer. (3 marks)
Correction: check them with series test lamp separately and remove the defects if possible.
(2) Blades rotate slowly and motor is heated up
Correction: Test the windings and cap with test lamp.
→ oil the brushes.
→ set the angle of blades.
(3) fan is giving noise
Correction: Blades angle may be defective so dry brushes. Shaft of rotor may be bent or loose shaft.
(4) Fan body isn’t revolving
Correction: check the gears and oscillating rod and replaced them.
Explain briefly the working Principle of a transformer. (3 marks)
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