Describe how a low-pass filter works.
What will be an ideal response?
A low-pass filter consists of a capacitor and a resistor in series. The input voltage is applied across both capacitor and resistor. The output is taken from across the capacitor. At low frequencies, the capacitive reactance is higher than the resistance, so most of the voltage is dropped across the capacitor. Therefore, most of the voltage appears across the output. As the input frequency increases, the capacitive reactance decreases, and less voltage is dropped across the capacitor. Therefore, more voltage is dropped across the resistor, with a decrease in the output voltage. The cut-off is gradual. Frequencies above the cut-off point pass with a gradual attenuation in the output voltage.
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What is the drawback of emergency heat?
A) The supplemental heat costs more to operate than a heat pump. B) It causes problems with the refrigeration systems. C) The compressor and outdoor fan are not energized. D) It activates the supplemental heat in the first stage.
A sewage pump draws wastewater out of a sump by _____.
a. centripetal force b. creating a partial vacuum c. osmotic exchange d. creating positive pressure
In a standard welding transformer, the size of the iron core is determined by ____.
A. the distance between the coils B. the length of time it takes for the magnetic field to build up and collapse C. the desired thickness of the weld bead D. the speed of the rotor
Carbon monoxide is a(n) ____________________ and odorless gas.
Fill in the blank(s) with the appropriate word(s).