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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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
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).
Current ____ voltage in an inductor.
A. lags B. leads C. is equal to D. is always in phase with