Fractionation occurs when ____.
A. some of a blended refrigerant evaporates or condenses before the rest of the blend
B. when only a fraction of the total charge has been added to a system
C. the operating pressures of a system increase
D. Both a and c.
Answer: A
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Which one of the following is not recommended?
A) not burning pesticide containers. B) transferring small amounts of leftover pesticides to smaller containers to save space in storage. C) wearing full protective clothing when mixing chemicals D) not using household preparations of chemicals used as pesticides.
Technician A places his finger over the breather hole when greasing a propeller shaft slip spline. Technician B says that to properly grease 5th wheel pivot pins when a tractor is coupled to a trailer, the weight on the 5th wheel should be relieved by cranking up the dolly legs. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
Divide the following numbers to obtain the correct quotient.4,015 รท 73 =
Fill in the blank(s) with the appropriate word(s).
Consider the east wall of a house that has a thickness of L. The outer surface of the wall exchanges heat by both convection and radiation. The interior of the house is maintained at T?1, while the ambient air temperature outside remains at T?2. The sky, the ground, and the surfaces of the surrounding structures at this location can be modeled as a surface at an effective temperature of Tsky for radiation exchange on the outer surface. The radiation exchange between the inner surface of the wall and the surfaces of the walls, floor, and ceiling it faces is negligible. The convection heat transfer coefficients on the inner and outer surfaces of the wall are h1 and h2, respectively. The thermal conductivity of the wall material is k and the emissivity of the outer surface is ?2.
Assuming the heat transfer through the wall to be steady and one-dimensional, express the mathematical formulation (the differential equation and the boundary and initial conditions) of this heat conduction problem. Do not solve.
