Question

Which type of motor is used in room coolers?

• A. Universal motor
• B. Shaded pole motor
• C. Capacitor start or capacitor run motor
• D. Repulsion motor

Answer 1

The Correct Option is C

Room coolers require motors that can provide reliable starting torque and efficient running performance at moderate power levels.
The capacitor start or capacitor run motor is commonly used in room coolers because it offers high starting torque and smooth running characteristics.
These motors have a capacitor in series with the auxiliary winding, which creates a phase shift between the currents, improving starting torque and efficiency.
They are more efficient and quieter than shaded pole or universal motors, making them suitable for household appliances like room coolers.
Other motor types:
Universal motors are mainly used in portable tools and small appliances requiring high speed.
Shaded pole motors have low starting torque and are used in small fans or blowers.
Repulsion motors are less common now due to maintenance issues.
Hence, capacitor start or capacitor run motors are preferred for room cooler applications.