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 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).
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.