Negative feedback
A) is used only in operational amplifier circuits
B) provides a signal at the input that is in phase with the output
C) is critical for the operation of electronic oscillators
D) provides a signal at the input that is 180° out of phase with the input
D
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A current imbalance as low as 4 milliamps may be detected by a(n) _____.
a. GFCI sensor b. mechanical sensor c. AFCI sensor d. fiber-optic sensor
Which of the following is the most efficient means of dealing with issues of internalizing externalities:
a. Proscribing practices. b. Prescribing practices. c. Prescribing performance. d. Cost sharing. e. Cross compliance.
Which component failure could keep the fan from operating during the heating cycle on a traditional standing pilot gas furnace?
A) A defective fan switch B) A bad thermostat wire connection on the G terminal C) A defective limit switch D) An open coil on the fan relay
In order for a flooded condenser type head pressure control system to operate, a device called a ____________________ has to be added to the system because of the extra refrigerant.
Fill in the blank(s) with the appropriate word(s).