If the jets in a multi jet meter become ___________, the meter will ___________. If the jet orifice becomes __________, the meter will ____________.

• A. clogged, over-register, worn, under-register
• B. unsealed, under-register, blocked, over-register
• C. clear, under-register, worn, over-register
• D. blocked, under-register, cracked, over-register

Answer: (A)

In a multi-jet meter, accuracy depends on each jet delivering a precise impulse to drive the rotor. If the jets become clogged, the flow pattern through the meter changes in a way that makes the meter indicate more water than is actually moving (over-reading). If a jet orifice becomes worn, the opening enlarges, altering the impulse per unit of water and causing the meter to register less than the actual volume (under-reading). Regular cleaning or replacement of jets helps keep the meter reading true.