What is the stage of an air conditioning repair process where a strong vacuum is applied:
a. Evacuation
b. Leak detection
c. Refrigerant identification
d. Recharge
A
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The discharge air temperature is warm and the pressure gauges are as shown. What is the MOST LIKELY cause?
A) Low on refrigerant
B) Icing of the evaporator
C) Lack of airflow through the condenser
D) Defective compressor
You were advised to use elemental sulfur in the reclamation of a saline-sodic soil. Indicate how the sulfur helps bring about this reclamation
A) Sulfur stimulates the formation of gypsum in the soil. B) Sulfur helps maintain high salt content while reducing exchangeable Na+ levels. C) Sulfur is oxidized and forms sulfuric acid which, in turn, removes the exchangeable Na+. D) Sulfur leaches down into the soil and increases the soil pH. E) Sulfur is oxidized to sulfates that will precipitate much of the exchangeable Na+.
The MAF sensor on a General Motors 3800 V-6 is being tested for contamination. Technician says that the sensor should show over 100 grams per second on a scan tool display when the accelerator is depressed to WOT (wide open throttle) on a running engine. Technician B says that the output frequency should exceed 7000 Hz when the accelerator pedal is depressed to WOT on a running engine. Who is
right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
When two gears are in mesh, the larger is called the pinion and the smaller is called the gear.
Answer the following statement true (T) or false (F)