B.P.S.C. CDPO (Pre) 2005
What does the speed of the fan depend on?
aVoltage✓ Correct
bMetal
cAluminum in the fan
dIron in the fan
Explanation
The speed of a fan can be controlled by voltage. Voltage control is the most popular method for speed control of induction-motor-driven fans such as table fans. Fan speed can also be controlled by resistance/rheostat control, capacitor control, and power-electronic regulators (triac regulators).
general-science