How do you determine the total R-value of a composite (made up of several materials) assembly?
A. ?Add the individual R-values.
B. ?Add the individual R-values and divide by the number of materials.
C. ?Add the inverses of the individual R-values.
D. ?Add the individual U-values.
Answer: A
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a. back b. service c. side d. front
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A) The flame rod expands from being heated, making a mechanical switch at its base B) The flame rod is made of a semiconductor material that acts as a silicon controlled rectifier when it is hot C) The resistance of the flame rod changes when heated by the flame D) The flame changes the AC voltage to pulsed DC current
Asking employees to sign a declaration of safety does not improve a company’s safety policy.