It become illegal to vent replacement refrigerants in:
A) November 15, 1993. B) November 14, 1994.
C) November 15, 1995. D) July 1, 1992.
C
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The following laboratory data has been recorded for a one hundred milliliter sample of water. Calculate the concentration of total solids, total dissolved solids, and total volatile solids in mg/L.
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A device that converts a nonelectrical impulse such as sound, heat, light, or pressure into an electrical signal is called a
A) A sending unit B) A switch C) An actuator D) Sensor
Answer the following statement(s) true (T) or false (F)
1. The transistor is often used as a simple switch. 2. When a transistor is driven into saturation, its frequency response is increased. 3. Most motor controllers and induction heating equipment seldom operate above about 100 Hz. 4. The versatility of the transistor switch permits it to be operated by a variety of sensing devices such as devices that sense light, sound, temperature, and magnetic induction. 5. A very common application for a transistor switch is the electronic ignition system of most automobiles.