40 TOP TRANSISTORS and APPLICATIONS Online Test – Questions and Answers 1. Which of the following conditions are needed to properly bias an npn transistor amplifier? Forward bias the base/emitter junction and reverse bias the base/collector junction Apply a positive voltage on the n-type material and a negative voltage on the p-type material Apply a large voltage on the base Forward bias the collector/base junction and reverse bias the emitter/base junction 2. To get a negative gate-source voltage in a self-biased JFET circuit, you must use a negative gate supply voltage voltage divider source resistor ground 3. Three different points are shown on a dc load line. The upper point represents the minimum current gain saturation point cutoff point quiescent point 4. In order for feedback oscillators to have any practical value, the gain has to be stabilized < 1 nonlinear self-adjusting 5. The depletion-mode MOSFET cannot operate in the ohmic region can operate with positive as well as negative gate voltages can operate with only positive gate voltages can operate with only negative gate voltages 6. In a class B push-pull amplifier, the transistors are biased slightly above cutoff to avoid a low input impedance unusually high efficiency crossover distortion negative feedback 7. Often a common-collector will be the last stage before the load; the main function of this stage is to buffer the voltage amplifiers from the low-resistance load provide a high-frequency path to improve the frequency response provide voltage gain provide phase inversion 8. A JFET has a low input resistance is a current-controlled device is always forward-biased is a voltage-controlled device 9. The capacitor that produces an ac ground is called a(n) coupling capacitor bypass capacitor ac open dc open 10. The primary function of the bias circuit is to hold the circuit stable at the designed Q-point hold the circuit stable at vin ensure proper gain is achieved hold the circuit stable at VCC Loading … Question 1 of 10
