Hotel Service Unit 15 Q10 Quiz

Correct Answer:
B) Rapidly increasing temperatures, indicating fast-spreading fires

Explanation:
Rate-of-rise detectors are designed to respond to sudden temperature increases, which are common in fast-spreading fires, making them effective for early detection.

Correct Answer:
B) Its electrical resistance varies with temperature

Explanation:
The thermistor’s resistance decreases as temperature increases, which allows the detector circuit to register changes in heat levels and trigger an alarm if a rapid rise occurs.

Correct Answer:
C) It signals an alarm

Explanation:
The control circuit monitors the thermistor's resistance, and when it detects a rapid rise, it triggers the alarm to alert personnel to a potential fire.

Correct Answer:
C) Thermistor

Explanation:
A thermistor, a temperature-sensitive resistor, is the key sensing component. Its resistance changes with temperature, allowing it to detect rapid changes in heat.

Correct Answer:
C) When a set rate of temperature increase, often around 15°F per minute, is detected

Explanation:
Rate-of-rise detectors activate based on how quickly temperature rises. If it exceeds a certain threshold (e.g., 15°F per minute), the alarm is triggered, helping detect fires early.

Correct Answer:
B) It responds faster to rapidly spreading fires due to detecting the rate of temperature increase

Explanation:
Unlike fixed-temperature detectors, rate-of-rise detectors respond to rapid temperature changes, providing quicker fire detection, especially for fast-spreading fires.

Correct Answer:
B) A control circuit

Explanation:
The thermistor is part of a control circuit, which monitors the thermistor’s resistance and activates the alarm when the rate of temperature rise exceeds a set threshold.

Correct Answer:
C) It signals an alarm

Explanation:
The control circuit monitors the thermistor's resistance, and when it detects a rapid rise, it triggers the alarm to alert personnel to a potential fire.