Fire Detection and Alarm system (FDA) is an important feature of an Intelligent Building (IB) from a security point of view. The automation of the FDA system is equally important to ensure the efficient working and safety of the occupants in the building. For this purpose, different fire detectors (input devices) are employed in FDA systems. i. List the different types of detectors used in the FDA system. ii. Explain the following smoke detectors in detail: Photoelectric smoke detectors Ionization smoke detectors