5. Which of the following types of tracer input signal can be used to study the extent of non-ideal flow?
A. Step signal
B. Pluse signal
C. Periodical signal
D. All of the above
5. Which of the following types of tracer input signal can be used to study the extent of non-ideal flow?
A. Step signal
B. Pluse signal
C. Periodical signal
D. All of the above