The heat of compression can be determined using:
A) The enthalpy difference from the beginning to end of the compressor line.
B) The enthalpy difference from the beginning to end of the metering device line.
C) The enthalpy difference from the beginning to end of the evaporator line.
D) The enthalpy difference from the beginning to end of the condenser line.
A
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Answer the following statement(s) true (T) or false (F)
1. A flow switch either closes or opens a set of gates. 2. Typical applications of flow switches are commonly found in the chemical and petroleum industries. 3. The insulation of the wire leading to the switches must be adequate to withstand the high pressure of the liquid inside the pipe. 4. You can consult the NEC® for insulation temperature ratings. 5. Air condition and heating circuits often use timed contacts that are self-contained and do not require a coil for operation. Their time delay is preset and cannot be adjusted.
What type of specialty valve is normally a very small stop valve?
A. diaphragm B. solenoid C. tempering D. relief
Technician A says that mechanical cleaning with scrapers or wire brushes can be used to remove deposits. Technician B says that steel wire brushes can be used to clean aluminum parts. Which technician is correct?
A) Technician A B) Technician B C) Both technicians D) Neither technician
The Law of Cosines states that the square of the length any side is equal to the sum of the squares of the lengths of the other sides minus twice the product of the lengths of the two sides and the cosine of their included angle.
Answer the following statement true (T) or false (F)