A dc power supply has a Po rating of 6 W (maximum) and a Pi rating of 15 W (maximum). The efficiency of the power supply is
A) 0.4% B) 4% C) 14% D) 40%
D
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Twenty inches of vacuum would be equivalent to how much pressure absolute?
A. 10 psia B. 5 psia C. 0 psia D. 14.7 psia
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?A molecule of propane is made up of ____.
A. ?one propyl and one carbon atom B. ?one oxygen and one hydrogen atom C. ?two hydrogen and two carbon atoms D. ?eight hydrogen and three carbon atoms
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Soils that have a large percentage of clay can cause problems for plants
Indicate whether the statement is true or false
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Air flows through the components of an electronic air cleaner in which order?
A. pre-filter, ionization section, charcoal filter B. charcoal filter, pre-filter, ionization section C. ionization section, charcoal filter, pre-filter D. pre-filter, charcoal filter, ionization section
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