题目内容

A class AB amplifier ().

A. conducts through 180〫of the input waveform
B. conducts between 180〫and 360〫of the input waveform, depending on the amount of dc bias
C. conducts through less than 180〫of the input waveform
D. works only with digital and pulsed waveforms

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To get a current-voltage conversion circuit, () should be introduced in the amplifier circuit.

A. current-series negative feedback
B. current-shunt negative feedback
C. voltage-series negative feedback
D. voltage-shunt negative feedback

The diffusion director of the hole is ().

A. from the region of high concentration to low concentration
B. from the region of low concentration to high concentration
C. in the same direction of applied electric force
D. in the opposite direction of applied electric force

The majority carriers in n-type materials are ().

A. donor
B. acceptor
C. electrons
D. holes

Some of the modern ohmmeters have a diode test setting. If you do not have one of these ohmmeters then to test the diode you need to check its resistance in the forward and the reverse direction. These resistances should be ().

A. relatively high in the forward direction and relatively low in the reverse direction
B. relatively low in the forward direction and relatively low in the reverse direction
C. relatively low in the forward direction and relatively high in the reverse direction
D. relatively high in the forward direction and relatively high in the reverse direction

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