Positive displacement compressors have crankcase heat to ____.
A. preheat the chilled water for better efficiency
B. prevent refrigerant migration to the compressor
C. preheat the compressor bearings for longer wear
D. minimize condenser subcooling
Answer: B
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A. RF waves B. lithium battery C. IR energy D. visible light
Problem 1.30 Two wooden members of uniform rectangular cross section are joined by the simple glued scarf splice shown. Knowing that the maximum allowable shearing stress in the glued splice is 620 kPa, determine (a) the largest load P that can be safely applied, (b) the corresponding tensile stress in the splice.
Determine the force F between the faces of the poles (stationary coil and plunger) of the solenoid pictured in Figure P18.38 when it is energized. When energized, the plunger is drawn into the coil and comes to rest with only a negligible air gap separating the two. The flux density in the cast steel pathway is 1.1 T. The diameter of the plunger is 10 mm. Assume that the reluctance of the steel is negligible.
