Explanation: Gravity feed method for solvent delivery is not used with narrow bore columns packed with fine mesh particles. This is because they cannot deliver solvent at high pressure. 9. Which of the following cannot be done to reduce ripple in High pressure liquid chromatography?
A. Using bellows
B. Using restrictors
C. Using long nylon tube between pump and column
D. Avoiding the use of solvent pump
Answer:A
Explanation: Gravity feed method for solvent delivery is not used with narrow bore columns packed with fine mesh particles. This is because they cannot deliver solvent at high pressure. 9. Which of the following cannot be done to reduce ripple in High pressure liquid chromatography?
A. Using bellows B. Using restrictors C. Using long nylon tube between pump and column D. Avoiding the use of solvent pump
Explanation: Solvent pumps have to be used to reduce pulses in solvent flow. When there is a pulsed flow, the efficiency of column decreases. 10. Which of the following is not true about Hydraulic capacitance flow control system used in HPLC?