would you please help me solve the following question:-

all 3 questions are related to a PID experiment.

1. What would happen to the global time constant of the process if the large-diameter column replaced the small diameter column? Justify your answer

2. What would be the effect on the level in the column of increasing the resistance at the exit of the upper tank? Consider that the level in the upper tank is already at its maximum.

3. Time response of the second order interacting and non-interacting process involving liquid level control system using two identical tanks for a unit step input is as shown. Why the Interacting process is slower than non-interacting process? Justify your answer analytically