Why are virtually all oscillators used in communications applications the feedback type?
A. They are capable of producing highly pure sine waves.
B. The currents in the diodes and the currents in the transistors are the same.
C. They use RC timing circuits to generate nonsinusoidal waveforms.
D. They allow waveform distortion.
A
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Only masonry materials should be used in constructing a chimney that serves as a fireplace.
Answer the following statement true (T) or false (F)
The primary control must ensure that ignition is established in the combustion chamber to prevent an accumulation of ____ vapor.
a. cadmium sulfide b. silicon c. oil d. water
Single conductor sizes for a power-limited fire alarm circuit cannot be smaller than ____________.
A. 16 AWG B. 18 AWG C. 22 AWG D. 26 AWG
If a lockout relay becomes defective, it should be replaced with an exact duplicate, sometimes called a(n) _____.
a. induced-draft relay b. control relay c. time-delay relay d. impedance relay