During an AC performance test, an R-134a air conditioning system has a measured center duct outlet temperature of 59 degrees F. A manifold gage set shows low side pressure ranges between 10-15 psi and the high side pressure ranges from 100-140 psi. Shop temperature is 72 degrees F. What is most likely the cause?
a. The system has insufficient charge
b. The system contains air with the refrigerant
c. The TXV is defective and is opening too much
d. The system is overcharged
A. The system has insufficient charge
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Footlights in a stage that are designed to disappear into a storage recess when not in use must be designed so that _____.
a. their external temperature cannot exceed 125°F (51.6°C) b. the power supply is automatically disconnected when the lights are retracted c. no flammable materials are within 12 inches (30.5 cm) d. their wattage is automatically reduced when the lights are retracted
To maximize the efficiency of water usage, it is important that make sure the soil is tilled as shallow as possible and to increase aeration, drainage, and nutrient- and waterholding capacity of the soil
Indicate whether the statement is true or false
Pieces of board less than 1 inch thick are usually calculated using a thickness of 1/2 inch.
Answer the following statement true (T) or false (F)
All of the gasses are measured in percentages EXCEPT ________
A) HC B) CO C) CO2 D) O2