Explain why the wetting of an insulating material reduces its R-value. In which situations is this fact is important?
What will be an ideal response?
Water is a good conductor of heat, i.e., a poor insulator. Therefore, wetting of insulation reduces its R-value. This fact is important in insulated exterior wall and roof assemblies. If these assemblies are not properly detailed, rainwater leaking into the assembly will wet the insulation, reducing its R-value.
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Duty cycle is measured in:
A) 1-hour increments B) 10-minute increments C) 15-minute increments D) 20-minute increments
Used within poured-in-place concrete structures, ____ are used to brace tall structures against lateral loading from wind and swaying motions.
A. security walls B. shear walls C. tilt-up walls D. retaining walls
Which of the following metering devices can respond to changes in system conditions?
A) Orifice B) Fixed restriction C) Thermostatic expansion valve D) Capillary tube
Technician A says a drum filled with thick fluid that houses several closely fitted, thin steel discs that are connected to the front and rear axles is called a viscous coupling. Technician B says to provide different amounts of torque to the drive axles, a viscous coupling uses a gear set similar to a differential. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B