Question

The speed of motor or blower of room cooler is controlled by ________. (Selector switch Toggle switch)

Hint:

A selector switch acts as a multi-throw rotary contactor, allowing the user to safely change the connection configuration of tapped stator windings without needing complex electronic speed controllers.

Answer 1

Step 1: Evaluating Cooler Speed Control Methods:
Room cooler blower motors require multi-step speed regulation (typically Low, Medium, and High speeds). This speed control is accomplished by using a multi-tap winding configuration within the motor stator. Changing the active tap changes the number of effective turns in the windings, which alters the magnetic field strength and the motor speed.

Step 2: Comparing Switch Controls:

• Toggle Switch: A simple two-position binary switch (e.g., ON/OFF or high/low). It cannot handle multiple output channels or complex circuit switching.
• Selector Switch: A rotary or multi-button mechanical switch that allows the user to select from several distinct circuit paths (e.g., Speed 1, Speed 2, Speed 3, OFF), routing the current to the appropriate motor winding tap.

Step 3: Conclusion:
Therefore, a Selector switch is the correct component used to control room cooler speeds.