What is the advantage of using multiple compressors on a supermarket rack system?
A) The compressors can operate at a higher compression ratio as a parallel group.
B) Extra compressors provide backup in case one quits working.
C) System capacity can match refrigeration loads which vary over a wide range.
D) Using multiple parallel compressors makes the use of multiple refrigerants possible.
C
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With a self-excited direct generator mounted on the rotor shaft, the amount of excitation current is adjusted by controlling the ____________________ of the generator.
Fill in the blank(s) with the appropriate word(s).
Determine the toll charge to maximize revenues. Let T = toll charge.
A toll bridge carries 6,000 veh/day. The current toll is $3.50/vehicle. Studies have shown that for each increase in toll of 50 cents, the traffic volume will decrease by 500 veh/day. It is desired to increase the toll to a point where revenue will be maximized. What will be an ideal response?
Commercial refrigeration equipment for ice cream storage typically uses:
A) High-temperature evaporators. B) Medium-temperature evaporators. C) Low-temperature evaporators. D) Ultra-low-temperature evaporators.
____, one type of commonly used drawing that illustrates materials and how they fit together, cut through an entire building or structure.
A. Full sections B. Partial sections C. Offset sections D. Overall sections