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You Are On Multi Choice Question Bank SET 1044

52201. The effectiveness of a filter in rejecting signals beyond cutoff frequency is a function of the filter roll-off rating.



52202. A two-pole active filter produces a roll-off rate of –20 dB/decade.



52203. A zero-level detector is a type of comparator circuit.



52204. In the given circuit, VIN1 equals ______.





52205. The rate of change of the output voltage in the given circuit equals ______.





52206. A mathematical operation for finding the area under the curve of a graph is called __________.





52207. In the given circuit, if Rf is reduced to 8 k, the circuit becomes the ______.





52208. The reference voltage for the comparator in the given circuit equals ______.





52209. Above the critical frequency (fc) of a low-pass filter, the output voltage gain _______.





52210. In order to sustain oscillations in a feedback oscillator, the gain should be _________ so the Acl _______.





52211. The given circuit is a two-pole, active ______ filter.





52212. The ______________ input makes the summing amplifier circuit possible.





52213. The critical frequency for the active filter in the given circuit is approximately _______.





52214. A mathematical operation that determines the rate of change of a curve is called __________.





52215. A Wien-bridge oscillator uses _________.





52216. The center frequency of a band-pass filter is always equal to the





52217. The formula shows that for a given capacitor, if the voltage changes at a constant rate with respect to time, the current will





52218. A zero-level detector is a





52219. A digital-to-analog converter is an application of the





52220. If the value of resistor Rf in an averaging amplifier circuit is equal to the value of one input resistor divided by the number of inputs, the output will be equal to





52221. In a C-E configuration, an emitter resistor is used for:





52222. Voltage-divider bias provides:




52223. To operate properly, a transistor's base-emitter junction must be forward biased with reverse bias applied to which junction?





52224. The ends of a load line drawn on a family of curves determine:





52225. If VCC = +18 V, voltage-divider resistor R1 is 4.7 k, and R2 is 1500, what is the base bias voltage?





52226. The C-B configuration is used to provide which type of gain?





52227. The Q point on a load line may be used to determine:





52228. A transistor may be used as a switching device or as a:





52229. If an input signal ranges from 20–40 A (microamps), with an output signal ranging from .5–1.5 mA (milliamps), what is the ac beta?





52230. Which is beta's current ratio?





52231. A collector characteristic curve is a graph showing:





52232. With low-power transistor packages, the base terminal is usually the:





52233. When a silicon diode is forward biased, what is VBE for a C-E configuration?





52234. What is the current gain for a common-base configuration where IE = 4.2 mA and IC = 4.0 mA?





52235. With a PNP circuit, the most positive voltage is probably:





52236. If a 2 mV signal produces a 2 V output, what is the voltage gain?





52237. The symbol hfe is the same as:


52238. Most of the electrons in the base of an NPN transistor flow:





52239. In a transistor, collector current is controlled by:





52240. Total emitter current is:





52241. Often a common-collector will be the last stage before the load; the main function(s) of this stage is to:





52242. For a C-C configuration to operate properly, the collector-base junction should be reverse biased, while forward bias should be applied to which junction?





52243. The input/output relationship of the common-collector and common-base amplifiers is:





52244. If a transistor operates at the middle of the dc load line, a decrease in the current gain will move the Q point:





52245. Which is the higher gain provided by a C-E configuration?





52246. What is the collector current for a C-E configuration with a beta of 100 and a base current of 30 A?




52247. A decrease in base current of a C-E amplifier causes the voltage measured between the emitter and the collector to increase.



52248. In this analog amplifier the input is in phase with the output.



52249. The voltage measured from the collector to the emitter is the sum of the voltage base-emitter plus the voltage collector-base.



52250. This is a PNP transistor.



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