Red Seal Appliance Service Technician Practice Exam

What is the function of a cycle thermostat in a dryer?

1. To maintain drum rotation speed

2. To regulate the drying temperature

3. To monitor moisture levels

4. To control the lint filter

The correct answer is: To regulate the drying temperature

The cycle thermostat in a dryer is responsible for regulating the drying temperature. This component plays a critical role in ensuring that the dryer operates within a specified temperature range during its drying cycles. By doing so, it helps to prevent clothes from overheating, which could lead to damage or even fire hazards. The thermostat continuously monitors the temperature of the air within the dryer drum and adjusts the heating element accordingly. If the temperature exceeds the set limit, the thermostat will cut power to the heating element, allowing the dryer to cool down before resuming the drying process. This regulation not only enhances the efficiency of the drying cycle but also contributes to the longevity of both the appliance and the garments being dried. In contrast, other functions listed in the options relate to different aspects of dryer operation. For example, maintaining drum rotation speed involves the motor and belt system rather than the thermostat. Monitoring moisture levels is typically handled by a moisture sensor within modern dryers. The lint filter control is related to lint management and is not associated with temperature control, demonstrating that the purpose of the cycle thermostat is distinct and crucial for safe and effective drying.