Question

engineers design a system for heating the air in a house. they want the heater to bring the temperature to a comfortable level and then maintain it. which option describes how the engineers should design the system? a. design the system with a control that allows positive feedback to enhance the heating ability of the system. b. include a control in the system that varies the input level in a regular cycle. c. include a control in the system that senses the air temperature and causes negative feedback, reducing the output of the heater. d. design the system with a control that maintains a constant level of output from the heater.

Explanation:

Negative - feedback systems are used to maintain a stable state. In this case, sensing the air temperature and using negative feedback to reduce the heater's output will help bring the temperature to a comfortable level and maintain it. Positive feedback (Option A) would increase the heating indefinitely. A regular - cycle input variation (Option B) doesn't target temperature maintenance. A constant output (Option D) doesn't account for changes in the environment that affect temperature.

Answer:

C. Include a control in the system that senses the air temperature and causes negative feedback, reducing the output of the heater.