UNDERSTANDING - 7 - NMC TESTING_Stability Milkline Receiver

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* 1. Enter first and last name

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* 2. Vacuum stability at the milkline should be measured:

under normal cleaning conditions, at the beggining and at the end of the process

under normal milk and airflow conditions (while clusters are being attached, while all clusters are on cows, and while clusters are being detached).

while clusters are being washed, and while clusters are being drained.

under normal airflow conditions, not during milking

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* 3. Vacuum level and vacuum stability in the milkline do NOT depend on:

Vacuum pump capacity

Vacuum control or regulation device

Planned and unplanned air admission

Slugging of milk that may occur in the milkline

Milk pump capacity

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* 4. Vacuum in milkline should not change by more than _____ from the operating vacuum level during the course of normal milking.

+/- 2 kPa (0.6 in Hg)

+/- 0.6 kPa (0.2 in Hg)

+/- 6.0 kPa (2.0 in Hg)

+/- 1.0 kPa (0.3 in Hg)

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* 5. Which of these indicate that stratified flow is NOT present in the milkline:

milk flows in the lower part of milkline and air flows in a clear, continuous path above the milk

milk enters the receiver unevenly

milkline vacuum drops by 6 kPa (1.2 "Hg) below receiver vacuum when a milking unit is attached

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* 6. If vacuum in the milkine is affected by slugging, which of the following remedies (in order of priority) would you consider?

1. Increase milkline diameter 2. Increase milkline slope 3. Reduce restrictive fittings in milkline near the receiver 4. Reduce air admitted by operators

1. Reduce air admitted by operators 2. Increase milkline slope 3. Reduce restrictive fittings in milkline near the receiver 4. Increase milkline diameter

1. Reduce air admitted by operators 2. Decrease milkline slope 3. Reduce restrictive fittings in milkline near the receiver 4. Decrease milkline diameter

1. Increase milkline diameter 2. Decrease milkline slope 3. Reduce restrictive fittings along milkline 4. Reduce air admitted by operators

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* 7. Vacuum in the receiver should not change by more than +/- 2 kPa from the operating vacuum level during the course of normal milking. Which of these are NOT included in the definition of normal milking?

teatcup removal

cluster fall-off

liner slips

teatcup attachment

removing a milkhose from the milkline

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* 8. Select all that apply. Milklines should be installed so that:

they have a continuous gradient towards the receiver, with a minimum gradient of 0.8% (8 mm per meter, or 1 in. per 10 ft)".

milkline slope may be increased slightly near the receiver end of the milkline.
If the milkline slope is increased slightly near the receiver end of the milkline, there is a compensation for the effects of bends or other fittings.

Flat spots are near the far end of the milkline

Reverse slopes that collect milk can be cleared by air admission

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* 9. Select all that apply. The number of milking units that can be used on a milkline depends on:

Peak Milk flow rates of animals being milked

milkline slope

Milk pump capacity

Milkline diameter