UNDERSTANDING - 7 - NMC TESTING_Claw Vacuum

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* 1. Enter first and last name

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* 2. What is the most direct method for determining the adequacy of vacuum production and regulation of a milking system?

milking-time tests (tests performed during milking)

dry tests (tests performed with the equipment running, but not milking)

cleaning-time tests (tests performed during the cleaning process)

wet tests combined with cleaning-time tests, which are completed with high-level testing equipment

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* 3. What is the most useful site for evaluating the vacuum level that the cow experiences during milking?

near the receiver

at the regulator

in the claw

in the pulsation chamber

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* 4. How should average claw vacuum be measured?

on a representative sample of cows in the herd during peak milk flow

on a representative sample of cows in the herd during low milk flow

on one third of the cows in the herd during low milk flow

on both the highest and lowest producing cows of the herd during peak milk flow

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* 5. Why should a series of 5 to 20 second snapshots be taken over the entire period of milking a cow?

because a series of 5 second averages provides a picture of how average claw vacuum changes over the range of milk flow rates

because a series of 20 second averages shows how peak claw vacuum changes for each cow

because 5 seconds is enough time to illustrate minimum claw vacuum, and 20 seconds are needed to calculate maximum claw vacuum

to get a picture of how vacuum fluctuations differ among cows

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* 6. Select all that apply. What are the advantages of using a flow simulator to estimate the relationship between system vacuum and claw vacuum?

liquid flow rate is held constant at a known value

allows a quick and accurate assessment of different system configurations

eliminates cow-to-cow variation in flow rates

liner slip air admission can be eliminated

liquid flow rate is variable at unknown values during testing as it is during milkin

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* 7. What is the target range for average claw vacuum as a good compromise to allow cows to be milked gently, quickly, and completely?

between 35 and 42 kPa during the peak flow period

between 30 and 38 kPa during the peak flow period

between 33 and 40 kPa during the low flow period

between 40 and 46 kPa during the low flow period

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* 8. Select all that apply. What factors affect the selection of the milking system vacuum?

the weight of the cluster used

the importance of the completeness of milking

the type of receiver used

the type of liner used

the importance of the milking speed to the farmer

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* 9. Select all of the correct descriptions of the target range for average claw vacuum.

higher average claw vacuum will result in milking that is less complete

higher average claw vacuum will result in quicker milking

lower average claw vacuum will result in milking that is more gentle

higher average claw vacuum will result in more liner slips

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* 10. What factor has the least influence on the difference between the milkline vacuum and the average claw vacuum?

system configuration (milk hose length and diameter, fittings in the milk hose)

flow rate of milk through the milk hose

flow rate of air admitted into the milking unit (liner slips)

pulsation rate and ratio

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* 11. Unusually high or low vacuum fluctuations in the claw are a sign of:

oversized or undersized (plugged) air vents

high milk flow rates

low milk flow rates

an improper liner

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* 12. Claw vacuum fluctuation is used to:

check if the cluster passes the requirements in the national and international standards (ASABE S518, ISO 5707)

provide an accurate measure of the vacuum fluctuations at the teat end

see if the cluster is working according to the manufacturer's recommendations

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* 13. What is the most important vacuum measurement for the cow?

vacuum in the main airline

vacuum in the receiver

vacuum in the claw

vacuum in the pulsation chamber

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* 14. Select all that apply. Average claw vacuum can be maintained closest to the milkline vacuum by:

reducing restrictions across fittings and ancillary equipment in the milk flow path

reducing milk lift

reducing long pulsation hose length

reducing long milk tube hose length

increasing system vacuum