A blocked-rotor test was performed on a 5-hp, 220-V, four-pole, 60-Hz, three-phase induction motor. The following data were obtained: V = 48 V, I = 18 A, P = 610 W. Calculate
a. The equivalent stator resistance per phase RS .
b. The equivalent rotor resistance per phase RR.
c. The equivalent blocked-rotor reactance per phase XR.
Analysis:
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A copper block having a mass of 10 kg and a temperature of 800 K is placed in a well-insulated vessel containing 100 kg of water initially at 290 K. What will be the final temperature of the block and the entropy changes for the copper, the water, and the universe resulting from the process? Does this number (the entropy change of the universe) “make sense” to you?
The EPA regulates ____________________ and ____________________ of wastes.
Fill in the blank(s) with the appropriate word(s).
Since most interiorscapers do not ____, greenhouse space may not be needed if product can be turned
around quickly.
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____ is a compound of iron and carbon, Fe2C.
A. Ferrite B. Cementite C. Pearlite D. Austenite