The process requires monthly verification of sieve adequacy and shaker time.

• A. True
• B. False
• C. Not specified
• D. Weekly

Answer: (B)

Regular sieve analysis relies on accurate sieve openings and correct shaker timing, both of which must be verified frequently. Sieve adequacy means the screens are intact, clean, and within tolerance so particles are separated properly, while shaker time ensures the agitation duration matches the standard used for the test. Because equipment can drift with use—through wear, clogging, or timing variations—these checks are typically done daily or before each set of sieve analyses, not on a monthly basis. The verification process involves confirming the timer is set to the prescribed interval, ensuring the shaker operates consistently, inspecting sieves for damage or wear, and confirming the sieve stack is assembled correctly. If any deviations are found, recalibration or replacement is required before testing resumes.