Explain how smoke detectors work.
What will be an ideal response?
Most smoke detectors work either by optical detection or by ionization, but some of them use both detection methods to increase sensitivity to smoke.
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Symbol A in Figure 1 represents a _____.
a. float switch
b. temperature switch
c. pressure switch
d. foot switch
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Which of the following insulated components is the entry point for combustion air supplied to the boiler burners?
a. Windbox b. Air heater c. Penthouse d. Downcomer
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Which type of crankshaft fracture failure would result from an excessive shock load?
A. brittle fracture B. ductile fracture C. fatigue fracture D. compressional fracture
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The interbreeding of feral cats yields what is frequently referred to as alley cats
A. True B. False
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