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Electrical ballast: Quiz


Question 1: They can be as simple as a series resistor as commonly used with small neon lamps or ________ (LEDs).
Gas-discharge lampLED lampLight-emitting diodeFluorescent lamp

Question 2: In more expensive ballasts, a ________ is often paired with the inductor to correct the power factor.
Electrical impedanceCapacitorElectronic componentCapacitance

Question 3: Because the resistance of the ballast resistor is large it dominates the current in the circuit, even in the face of ________ introduced by the neon lamp.
Negative differential resistanceNegative resistanceRelaxation oscillatorResonant tunneling diode

Question 4: Physically, some such devices are often built quite like ________.
FlashtubeFluorescent lampIncandescent light bulbCompact fluorescent lamp

Question 5: An inductor is very common in line-frequency ballasts to provide the proper starting and operating electrical condition to power a ________, neon lamp, or high intensity discharge (HID) lamp.
Fluorescent lampIncandescent light bulbFlashtubeCompact fluorescent lamp

Question 6: Examples of such negative-resistance devices are ________.
Gas-discharge lampFlashtubeFluorescent lampLight-emitting diode

Question 7: The ________ controls the initial voltage strike to the bulb to start it and then controls current in the bulb for the most efficient burning of the lamp.
FirmwareRead-only memoryOperating systemBIOS

Question 8: In some old AC/DC receivers (universal sets), the ________ heaters are connected in series.
Hot cathodeVacuum tubeDiodeX-ray

Question 9: They commonly also produce acoustic ________ (line-frequency hum).
NoiseNoise (video)Noise measurementNoise (electronics)

Question 10: An electrical ballast (sometimes called control gear) is a device intended to limit the amount of current in an ________ circuit.
ElectricityElectromagnetismElectric chargeMagnetic field


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