Digital quantities have values that are specified as 1 or 0, HIGH or LOW, etc. The voltage values associated with these digital quantities fall within specified limits. On the other hand, analog values for physical process control may be any value over a wide range of values, with each different value having a different meaning. As a result:
A) digital computers are unable to monitor or control physical analog operations with any degree of accuracy or certainty.
B) digital computers are unable to monitor analog physical values regardless of the interfacing techniques used to make the two systems compatible.
C) digital computers have the capability to monitor only those analog physical operations that fall within the specified ranges of digital HIGH and LOW voltage levels.
D) digital computers that monitor or control analog physical values must have an accurate means of transforming analog data to meaningful digital data and vice-versa.
D
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During World War II, most Americans economically experienced
A. serious hardships due to rationing of essential goods. B. prosperity and a doubling of personal income. C. a continuing struggle to find employment. D. growing class conflict between the wealthy and the working class. E. prosperity in the cities but disastrous conditions on farms and in small towns.
In vi, a tilde (~) precedes all line-oriented commands.
Answer the following statement true (T) or false (F)
The superheat is 12°F. What is the suction line temperature if the evaporator saturation temperature is 35°F?
A) 17°F B) 23°F C) 47°F D) 10°F
How would high levels of inhalation of a refrigerant affect an individual?
A) Delusions may be possible. B) No adverse reaction would occur. C) Cardiac arrhythmia may occur D) The skin may burn.