On systems with three access values, the vacuum pump should be connected to:
A) The evaporator coil, only if the Schrader value has been removed.
B) The compressor.
C) The middle port of a standard three-port manifold.
D) The suction line service valve.
C
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Which of the following is the symbol for a natural draft counter-flow cooling tower?
Figure
Answer the following statement(s) true (T) or false (F)
1. Cross connections between an individual water supply system and other individual or public water supply systems are prohibited. 2. There are several jurisdictions where licensing programs do not include licensed well drillers and pump installers. 3. Hydropneumatic tanks shall have a working pressure rating that does not exceed the maximum required system pressure. 4. Well casings, curbs, and pitless adapters shall terminate no fewer than 8 inches above the finished ground surface or pump house floor and at least 24 inches above the maximum high-water level where flooding occurs. 5. Systems, which have vents, shall be of adequate size to allow equalization of air pressure in the well and shall not be less than 3/4 inch in diameter.
The ____ is created by rubbing a piece of soft iron with a piece of magnetite.
A. artificial magnet B. electromagnet C. permanent magnet D. temporary magnet
A thermistor that increases its resistance as temperature rises is said to have a _____.
a. high temperature coefficient b. positive coefficient of resistance c. negative coefficient of resistance d. coefficient of high resistance