Final answer:
When starting a gas turbine engine, the two primary gauges to observe are Fuel flow and exhaust gas temperature, which are key to ensuring proper fuel delivery and temperature regulation.
Step-by-step explanation:
When starting a gas turbine engine, the two primary gauges to observe are Fuel flow and exhaust gas temperature. These gauges are crucial because they provide immediate feedback on two critical aspects of the engine's operation during the startup process. Fuel flow gauges ensure that the engine is receiving the appropriate amount of fuel, while exhaust gas temperature gauges monitor the engine's temperature to avoid overheating and potential damage. It's important to understand the application of these gauges in the context of various devices and processes, such as the internal combustion engine and the ideal reversible Otto cycle, which involve similar principles of monitoring and regulation of fuel and temperature. Moreover, understanding gauge pressure versus absolute pressure, as well as the function of aneroid and ionization gauges, can provide a deeper insight into the intricate details of pressure and temperature measurement relevant to the operation of gas turbine engines.