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60.An LED A. emits light when forward-biasedB. emits light when reverse-biased C. acts as a variable resistance D. senses light when reverse-biased 61.Compared to a visible red LED, an infrared LED 62.The internal resistance of a photodiode C. increases with light intensity when reverse-biased D. decrease with light intensity when forward-biased 63.A diode that has a negative resistance characteristics is the 64.An infrared LED is optically coupled to a photodiode. When the LED is turned off, the reading on an ammeter is series with the reverse-biased photodiode will 65.In order for a system to function properly, the various types of circuits that make up the system must be CHAPTER 4 66.The three terminals of a bipolar junction transistor are called A. input, output, ground C. p,n,p B. base, emitter, collectorD. n,p,n 67.In a pnp transistor, the p-region are 68.For operation as an amplifier, the base of a npn transistor must be
69.The emitter current is always 70.The βDCof a transistor is its A. internal resistance B. power gain C. voltage gain D. current gain71.If ICis 50 times larger than IB, then βDCis 5072.The approximate voltage across the forward-biased base emitter junction of a silicon BJT is BB73.The bias condition for a transistor to be used as linear amplifier is called A. reverse-reverse B. forward-reverse74.If the output of a transistor amplifier is 5 V rms and the input is 100 mV rms, the voltage gain is 100