MEASURING - 7 - NMC TESTING_Effective and Manual Reserves

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* 1. Enter your first and last name

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* 2. Select all that apply. Reserve airflow capacity is available to cope with unplanned air admissions such as air admitted when:

milking units are applied or removed

teatcups slip or fall during milking

clusters are kicked off during milking

milk flow increases during milking

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* 3. Select all that apply. What should be done when performing the test for effective reserve in a milking machine?

The machine should be set to be in an "as milking" condition (the pulsators operating, teatcups plugged, and vacuum applied to the claws).

The operating vacuum at the receiver and the regulator sensing point should be measured.

Air should be admitted to the receiver with an airflow meter until the receiver vacuum is 2 kPa (0.6 inches of mercury) below the working vacuum.

The vacuum pump capacity and the pulsation rate should be measured.

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* 4. Recommendations for effective reserve in milking machines are 1000 L/min + 30 L/min for each standard unit or maximum air admitted by one unit + 3% of this value per unit.

True

False

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* 5. Select all that apply. The test for manual reserve:

is completed exactly the same way as the effective reserve test

in systems with conventional regulators is completed the same way as the effective reserve test except that the regulator is disabled

is not applicable to systems with capacity controlled pumps (VFD controllers)

is applicable to systems with capacity controlled pumps (VFD controllers)

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* 6. What formula is used to calculate the regulation efficiency (as a percentage) of a milking system?

(effective reserve/manual reserve) × 90

(effective reserve/100) × manual reserve

(manual reserve/effective reserve) × 100

(effective reserve/manual reserve) × 100

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* 7. Regulation efficiency should be at least 90% for systems with conventional regulators.

True

False

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* 8. Select all of the correct statements regarding vacuum drop at the regulator sensor.

If the system is properly plumbed and the sensor is located correctly, the vacuum drop at the sensing point will be least 1.3 kPa (0.4 inches of mercury) when the vacuum drop at the receiver is 2 kPa (0.6 inches of mercury).

If the system fails the vacuum differential test, some possible causes include: mismatch between regulator capacity and pump capacity, piping between the receiver and regulator is inadequate for the pump capacity, and the vacuum regulator is located too far from the sanitary trap.

The vacuum drop at the sensing point must be least 3 kPa (0.9 inches of mercury) when the vacuum drop at the receiver is 6 kPa (1.8 inches or mercury).

If the system fails the vacuum differential test, one possible cause is that the vacuum regulator is located too close to the sanitary trap.

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* 9. Select all of the correct statements regarding low regulation efficiency.

Low regulation efficiency is diagnosed when the vacuum change near the regulator is 1.3 kPa (0.4 inches of mercury) or more.

Low regulation efficiency may be the result of a regulator that is unresponsive due to dirt and dust fouling, malfunction, or an outdated design.

Low regulation efficiency may be due to a regulator that is incorrectly matched with the size of the vacuum pump.

Low regulation efficiency may be due to a VFD regulator that is not set properly, or a faulty or fouled vacuum sensor.

In the case of Sentinel brand regulators, low regulation efficiency may be due to insufficient air lubrication.

Low regulation efficiency is diagnosed when the vacuum change near the regulator is 3 kPa (0.9 inches of mercury) or more.

Low regulation efficiency may be due to a regulator that is excessively lubricated.

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* 10. Select all of the correct statements regarding regulation efficiency.

If possible, the regulation efficiency should be improved so that the regulator can respond better.

If a system with a conventional regulator has excessive vacuum pump capacity, the small changes in airflow caused by unplanned air admission will be overshadowed by the excessive airflow through the regulator.

Reduced vacuum pump size will make the system more responsive and save energy.

In a system with a conventional regulator and excessive vacuum pump capacity, small changes in airflow caused by unplanned air admission will be highlighted by the airflow through the regulator, which can cause vacuum instability.