A refrigerated case that maintains a temperature of 28°F would be classified as:
A) A medium-temperature system. B) A low-temperature system.
C) A high-temperature system. D) A cryogenic system.
A
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As the trailing angle of an electrode is ____, penetration, depth, and burn-through ____.
A. decreased, decrease B. decreased, increase C. increased, increase D. flatter, increase
Consider steady heat transfer between two large parallel plates at constant temperatures of T1? = 290?K and T2 = 150?K that are L = 2 cm apart. Assuming the surfaces to be black (emissivity ? = 1), determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is (a) filled with atmospheric air, (b) evacuated, (c) filled with fiberglass insulation, and (d) filled with superinsulation having an apparent thermal conductivity of 0.00015 W/m•K.
What will be an ideal response?
UART uses a ________ signal that toggles to 0 V
A) 5-volt B) 12-volt C) 7-volt D) 8-volt
When leak testing a low-pressure chiller, the pressure should not be allowed to exceed 10 psig to avoid:
A) Opening the high-pressure cutout and shutting the system down. B) Freezing the chiller bundle. C) Breaking the rupture disk and losing the refrigerant charge. D) High compressor current draw.