Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Transcribed Image Text:4-7. Are the following statements true or false?
(a) The efficiency of a refrigerator is inversely proportional to the temperature difference
between indoors and outdoors.
(b) The efficiency of an automobile is inversely proportional to the temperature difference
between the engine and the outside air.
(c) The efficiency of a heat pump is directly proportional to the temperature difference
between indoors and outdoors.
(d) One of the key energy conversion devices in an electric power plant converts work to
heat.
(e) One of the key energy conversion devices in an automobile converts heat to work.
(f) The efficiency of conversion of heat to work is typically higher than the efficiency of
conversion of work to heat.
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