Final answer:
The sequence of operations for an atmospheric furnace is ignition, combustion, heat exchange, and exhaust.
Step-by-step explanation:
The correct sequence of operations for an atmospheric furnace is ignition, combustion, heat exchange, and exhaust. This process begins with the ignition of the fuel, which is followed by combustion where the fuel reacts with oxygen to produce heat. Subsequently, heat exchange occurs where the heat generated from combustion is transferred to the medium that needs to be heated. Finally, the exhaust stage involves expelling the byproducts of combustion, such as gases and particulates, out of the system.
The sequence as per the choices provided is (a) Ignition, combustion, heat exchange, exhaust.