List the temperatures that are critical during aluminum repairs and describe the importance of each of the temperatures.
What will be an ideal response?
• 400 - 570? F - This is the temperature range where technicians will have the most success repairing aluminum exterior panels
• 650?F - This is the temperature where non-heat-treatable alloys of aluminum will become annealed causing permanent changes to the structure of the metal.
• 755?F - This is the temperature where heat-treatable alloys of aluminum will become annealed causing permanent changes to the structure of the metal.
• 1200?F - This the melting point of aluminum which is significantly lower than that of steel which melts at 2700?F.
• 3700?F – This is the melting point of aluminum –oxide which must be thoroughly removed to produce aluminum welds of great strength.
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Cavity wall insulation must support its own weight without settling.
Answer the following statement true (T) or false (F)
Which of the following statements about hydrogen is true?
A. A hydrogen atom is one proton and two electrons. B. Hydrogen is one of the heaviest elements known and is full of energy. C. Fossil fuels are combinations of carbon and hydrogen. D. Hydrogen is produced in a fuel cell when water is broken down into its basic elements.
In the above figure, if the load decreases and causes the motor speed to increase, the voltage at the wiper arm of R11 ____________________ (increases, decreases), which causes the output of op amp 2 to become more ____________________ (negative, positive), which makes the output of the summing amp become more ____________________ (negative, positive), and causes the motor speed to ____________________ (increase, slow down).
Fill in the blank(s) with the appropriate word(s).
An agency CM system involving a number of contracts directly with the owner but managed by the contractor is usually called ___________.
Fill in the blank(s) with the appropriate word(s).