____ amplifiers find wide application where the full signal must be maintained, as in the amplification of audio signals in radios and televisions.
A. Class A
B. Class AB
C. Class B
D. Class C
Answer: A
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Fill in the blank(s) with correct word
____ pipe is used in most new construction.
A. Clay B. Plastic C. Concrete D. Metal
Of the following metals often found in sewage sludge, which would most likely become toxic to farmers' crops if sludge applications exceeded the recommended amounts?
A) Hg B) Cr C) Cd D) Cu E) Pb
What are proportional controls?
A) Proportional controls regulate the starting and stopping of the system to keep the run time ratio as low as possible. B) Proportional controls increase or decrease the output of a controlled device in proportion to the level of the measured condition. C) Proportional controls have the ability to measure the controlled variable and the system output and dynamically adjust the setpoint to achieve more precise control. D) Proportional controls integrate the signals from several sensors and control the system operation based on the proportion of sensors requiring conditioning.