La secuencia del contactor para el circuito que se muestra en la Figura 2 es tal que el/los contactor(es) _____ se energiza(n) durante la transición de funcionamiento de voltaje reducido a funcionamiento de voltaje completo.
a. 1S
b. 2S
c. 1S y 2S
d. 2S y R
d. 2S y R
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The total number of environmental impact categories in the latest version of LEED BD+C rating system, as given in this text, is
A) 5. B) 7. C) 9. D) 10. E) none of the above.
By mid-1941, Japan believed that it had no alternative to war with the United States because President Franklin Roosevelt
A. was committed to Britain and Holland retaining their colonial assets and economic power in the Dutch East Indies. B. had in 1941 imposed a freezing of assets and a cessation of all shipments and other critical raw materials in an effort to persuade Japan to withdraw from China. C. demanded Japan renew its trade with America. D. break its treaty of nonaggression with Germany. E. None of these choices are correct.
How does a hot-gas defrost system work?
A) Hot compressor discharge gas is routed to the evaporator. B) A warm glycol solution is sprayed on the coil. C) Gas flames provide the heat to melt the ice. D) The superheated gas leaving the evaporator is used to melt the ice.
When selecting a gas furnace, how is its heating capacity determined?
a. Its input rating must exactly match the calculated heat loss of the structure. b. Its output rating must exactly match the calculated heat loss of the structure. c. Its output rating can be up to 150 percent of the calculated heat loss of the structure. d. Its output rating should be no less than 95 percent of the calculated heat loss of the structure.