To prevent the spread of smoke and fire, fire dampers are designed to close
A) all the time except when the system is operating B) using the NO contacts of the fire alarm relay
C) automatically D) manually
C
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When charging a refrigeration system with a near-azeotropic mixture, what must be done to prevent liquid from entering the system?
A. Charge only as a vapor through the high side. B. Charge only liquid through the high side. C. Charge as a liquid through the low side using a restrictor. D. Charge as a vapor through the low side using a resistor.
What are the three categories that compose the chemical industry? Which one is the largest category?
What will be an ideal response?
An entrepreneurial electrical engineer has approached a large utility with a proposal that promises to reduce the utility’s power bill by at least 15% per year for the next 5 years through installation of patented surge protectors. The proposal states that the engineer will get $20,000 now and annual payments that are equivalent to 75% of the power savings achieved from the devices. Assuming the savings are the same every year at 15% and that the utility’s power bill is $1 million per year, what would be the equivalent uniform amount for years 1 to 5 of the payments to the engineer at an interest rate of 6% per year?
What will be an ideal response?
Carborundum rubbing stones used to smooth partly hardened concrete are typically _____
a. 12-14 inches long b. 9-11 inches long c. 6-8 inches long d. 3-5 inches long