Question 12Electricity & Electronics - 1st Asst/Chief
70% to passIn figure "A" of the illustration, the battery Vbb and resistor Rb are in the circuit for what purpose? Illustration EL-0022
Ato apply a buffer between the input ground and the emitter ground
Bto apply a reverse bias to the emitter-base
Cto apply a 'reference charge' on the input capacitor
Dto apply a forward bias to the emitter-base
AI Explanation
The correct answer is D) to apply a forward bias to the emitter-base. The battery Vbb and resistor Rb in the circuit are used to apply a forward bias to the emitter-base junction of the transistor. This forward bias allows the transistor to operate in its active region, enabling it to amplify or switch the input signal. The other options are incorrect because: A) a buffer is not the purpose of this circuit, B) a reverse bias would not allow the transistor to operate properly, and C) a 'reference charge' on the input capacitor is not the function of this part of the circuit.
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