1. When do we choose a thermocouple and not a RTD for temperature measurement? (Watch the video What is a temperature sensor)\ 2. How is pressure measured by a pressure sensor? What are the three types of pressures the pressure sensor can measure? (Watch the video What is a pressure sensor)\ 3. What are flow meters used for? Pick a flow meter of your choice and discuss the pro and cons. \ 4. A process instrumentation diagram for a flash drum is shown in the figure below. Steam is condensed in a steam coil to vaporize a portion of the liquid feed, and the liquid product is removed by a pump. There are five control valves for the steam flow (1), steam chest (2, which allows the steam chest to be rapidly evacuated in emergency situations), vapor product (3), liquid product (4), and feed flow (5). Determine whether the five valves should be air-to-open (Fail-closed) or air-to-close (Fail-open) for safe operation, for each of the two following cases and provide brief reasons. \ A. The safest conditions are achieved by the lowest temperature and pressure in the flash vessel.\ B. Vapor flow to downstream equipment can cause a hazardous situation.