Refrigeration systems that use nothing more than a thermostatically controlled solenoid valve feeding a distribution system can use ____________________ or ____________________ as their refrigerant.
Fill in the blank(s) with the appropriate word(s).
nitrogen, carbon dioxide
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Write the expression for travel demand on the bridge. Let V = travel demand.
A toll bridge carries 6,000 veh/day. The current toll is $3.50/vehicle. Studies have shown that for each increase in toll of 50 cents, the traffic volume will decrease by 500 veh/day. It is desired to increase the toll to a point where revenue will be maximized. What will be an ideal response?
____________________ is graded on the basis of the fineness of the fibers
Fill in the blank(s) with the appropriate word(s).
The float switch contacts may be either normally open or normally closed and ____.
a. may not be submerged b. may not be suspended c. may be submerged d. may be suspended
Current ____ voltage in an inductor.
A. lags B. leads C. is equal to D. is always in phase with