pls answer all 3 :( thank u so much!

1. what type of liquid liquid extraction equipment is best for systems with low to moderate interfacial tension including mixtures with emulsifying tendencies and can handle moderate production rate? baffle column A. Pulsed column B. Spray column C. Karr column D. Baffle column 2. What type of pump would you use for Q 5000 gal/min and head of 15 ft. H20 a. axial flow pump b. gear pump c. jet pump d. centrifugal pump 3. what is the entrance length of a 2 inch Sch. 49 pipe with Nre= 1800 a. 10ft b. 2 ft c. 9 ft d. 17 ft