Moisture in a system reacts with refrigerant to form _____.
a. an azeotrope
b. acids
c. air
d. nitrogen
b. acids
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There are two basic types of thermostats used in the industry today: the ____________________ thermostat and the line voltage thermostat.
Fill in the blank(s) with the appropriate word(s).
Answer the following statement(s) true (T) or false (F)
1. In a direct-current motor, the flux established by the permanent magnet is called the field flux.
2. For a direct-current motor, one can apply the left-hand motor rule in order to determine the direction of conductor motion when the direction of the current is known.
3. In the accompanying figure, which shows a current-carrying conductor in a magnetic field, the current is traveling into the plane of the paper (away from you).
4. The accompanying figure shows the torque graph for a single-loop armature.
Freeport McMoRan engineers estimated that the capital investment necessary for recovering valuable metals (nickel, silver, gold, etc.) from a copper refinery’s wastewater would be $150 million. The equipment is expected to have a useful life of 10 years with no salvage value. The amount of metal currently discharged in the wastewater is 12,500 pounds per year. The recovered metals are expected to have a selling price of $250 per pound. The efficiency relation of the recovery operation is represented by X 0.5, where X represents the efficiency in percentage. What value of X is necessary for the company to break even? Assume i = 10% per year.
The costs and revenue projections for a new product are estimated. What is the estimated profit at a production rate of 20% above breakeven? Fixed cost = $500,000 per year Production cost per unit = $200 Revenue per unit = $250
The flanges of steel studs are ________ inches thick
A) 1 1/2" B) 3/4" C) 3 1/2" D) 2"