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Total questions: 10
Worksheet time: 3mins
Which biasing method is most commonly used for bipolar junction transistors (BJTs)?
(a)
What is the input impedance of a common-emitter BJT amplifier?
a) The resistance seen by the signal source at the base terminal.
b) The resistance seen by the load at the collector terminal.
c) The conductance seen by the signal source at the base terminal.
d) The conductance seen by the load at the collector terminal.
What is the effect on the frequency response of a BJT amplifier if the coupling and bypass capacitors are removed?
a) The frequency response will extend to higher frequencies.
b) The frequency response will be significantly reduced at lower frequencies.
c) The frequency response will remain unchanged.
d) There will be no noticeable effect.
Which parameter(s) are most crucial in determining the quiescent point (Q-point) of a BJT?
a) β (beta)
b) VBE (base-emitter voltage)
c) IC (collector current)
d) All of the above
A common-base amplifier is known for its:
a) High input impedance and high output impedance.
b) Low input impedance and high output impedance.
c) High input impedance and low output impedance.
d) Low input impedance and low output impedance.
In a common-emitter amplifier with emitter degeneration, the bypass capacitor across RE is removed. Which of the following changes will be observed?
(a)
In a BJT circuit with emitter degeneration (an emitter resistor RE), what is the primary effect of increasing RE on the stability of the Q-point?
a) High input impedance and high output impedance.
b) Low input impedance and high output impedance.
c) Decreased sensitivity to variations in β and temperature.
d) High input impedance and low output impedance.
You are designing a BJT amplifier and need to ensure a stable Q-point despite variations in transistor parameters. Which biasing technique offers the BEST stability?
a) Collector-base junction capacitance.
b) Voltage divider biasing with emitter degeneration.
c) Emitter-base junction capacitance.
d) Current source biasing.
A common-emitter amplifier uses voltage divider biasing. If the DC supply voltage is increased, which of the following is MOST likely to occur, assuming all other components remain unchanged?
a) The Q-point shifts towards saturation.
b) The Q-point shifts towards cutoff.
c) The Q-point remains essentially unchanged.
d) The collector current (IC) decreases significantly.
What is the primary effect of increasing the load resistance (RL) on the voltage gain of a common-emitter amplifier?
a) The voltage gain decreases.
b) The voltage gain increases.
c) The voltage gain remains unchanged.
d) The voltage gain becomes unpredictable.
