Discuss refrigerant system safety
What will be an ideal response?
Never use oxygen or acetylene to pressurize a system. Oil that is in the system will not mix with oxygen or acetylene and may cause an explosion. Use dry nitrogen or carbon dioxide from a tank properly fitted with a pressure regulator. When isolating a section of piping or component of a system, exercise caution to prevent damage and potential hazard from liquid expansion. Always charge refrigerant vapor into the low side of the system. Liquid refrigerant entering the compressor could damage the compressor or cause it to burst. Never service a refrigeration system where an open flame is present. The flame must be enclosed and vented outdoors. If a fluorocarbon refrigerant comes in contact with intense heat, it can produce poisonous phosgene gas.
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Voltage drop is a better measurement of resistance than testing static resistance because _______
A) Current flow creates heat which adds to circuit resistance B) The resistance specification for the component is not required for diagnosis C) Both A and B D) Neither A nor B
How is the brake hose mounted to the stationary brake tubing and frame?
What will be an ideal response?
Which of the following can be used to reduce NOx emissions?
A. Increasing flue gas releases B. Switching to fuel with a lower nitrogen content C. Use of high NOX burners D. All of the above
The venturi tube is efficient for conserving energy because it _____.
a. aids in temperature reduction b. recovers pressure drop downstream from restrictions c. recovers flow drop downstream from restrictions d. increases flow through the pipeline