Final answer:
Air dampers are typically operated by an electrical signal, which is a signal transmitted by electric currents and voltages. In the context of damped harmonic motion, a non-conservative damping force removes mechanical energy from the system, which can manifest as heat or sound.
Step-by-step explanation:
The question relates to the operation of air dampers which are components commonly found in HVAC (heating, ventilation, and air conditioning) systems. Air dampers are responsible for controlling air flow within the ducts and overall system. They can be operated using various types of signals, depending on the design and requirements of the system.
In the context of your question, air dampers can be operated by:
- A) Electrical signal
- B) Electric signal
- C) Air signal
- D) Hydraulic signal
While options A) and B) might seem similar, in technical terminology, an electrical signal is commonly understood to mean a signal transmitted by electric currents and voltages, indicating that 'A) Electrical signal' would be the correct choice for operating air dampers in a standard HVAC system. Options C and D are different forms of energy used to operate systems but are generally less common for this specific application.
When considering damped harmonic motion, the non-conservative damping force removes mechanical energy from the system. This means that energy is lost over time in forms such as heat or sound, typically not in electrical form unless the system specifically converts mechanical energy into electricity.