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Use the following study to answer the following question(s): A researcher applies varying amounts of fertilizer (0, 2, 4, 8, 10 units) to 50 potted tomato plants. All other variables that may affect the outcome (watering, temperature, sunlight, plant size, etc.) are kept the same from pot to pot. At the end of the growing season, the tomatoes grown on each plant are weighed to determine which fertilizer level produced the largest tomato yield. Which variable is the independent variable?  

Technician A says that a sniffer test can be used to find a refrigerant leak. Technician B says that compressed air can be used to find a refrigerant leak. Who is correct?

The type of heat transfer where heat is transferred from one solid to another is called:

Unloaded performance test is being performed. The center vent temperature is 40o. The low side pressure is ____________ psi. UPerfTestSm.jpg [BLANK-1]

What affect does the accumulator have on the refrigerant?

Technician A says the receiver/drier is located on the low [pressure] side of the A/C system. Technician B says the accumulator is located on the low side of the system. Who is correct?

Brown dust on the AC clutch typically is an indication that the clutch may be:

 4-29 TXV SYS for test(3).jpg Refer to the figure above. Technician A says that the refrigerant at point 1 is a high pressure liquid. Technician B says  that the refrigerant at point 2 is a high pressure liquid. Who is correct?

Which of the following components is NOT part of a receiver/drier?

Technician A says that mode doors may be electrically operated. Technician B says that mode doors may be vacuum operated. Who is correct?