In deriving ac equivalent circuit for an amplifier circuit we short circuit
A. All resistors
B. All transistors
C. All inductors
D. All capacitors
Answer: Option D
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The action of JFET in its equivalent circuit can best be represented as a
A. Current controlled Current source
B. Current controlled voltage source
C. Voltage controlled voltage source
D. Voltage controlled current source
In a p+n junction diode under reverse bias, the magnitude of electric field is maximum at
A. The edge of the depletion region on the p-side
B. The edge of the depletion region on the n-side
C. The p+n junction
D. The center of the depletion region on the n-side
To prevent a DC return between source and load, it is necessary to use
A. Resistor between source and load
B. Inductor between source and load
C. Capacitor between source and load
D. Either A or B
To know the actual behavior of the AC amplifier circuit we have to convert this circuit in Vin to Vout form.
For that purpose, we have to do
1. Short all DC source
2. Short all Capacitors
as for AC frequency(50hz,60) never become zero so
Xc=1/2pifc= 0(approximately)
zero means short all capacitors