Electronics (ECE) - MCQ Practice Questions

The input impedance of an op-amp in an ideal configuration is assumed to be:

In a Common Emitter BJT amplifier, if the collector resistance is increased while keeping other parameters constant, how does the voltage gain change?

A non-inverting amplifier is constructed with an op-amp having open-loop gain A₀ = 100,000. If Rf = 90 kΩ and Rin = 10 kΩ, what is the closed-loop voltage gain?

What is the primary advantage of a Darlington pair configuration in BJT amplifiers?

A BJT is operated in the saturation region. Which of the following statements is true?

In a two-stage cascaded amplifier, the first stage has gain A₁ = 50 and bandwidth BW₁ = 100 kHz, while the second stage has A₂ = 20 and BW₂ = 200 kHz. What is the overall voltage gain?

A voltage-controlled voltage source (VCVS) has transconductance gm = 50 mS. If the input voltage is 10 mV, what is the output current?

What is the typical input impedance of a voltage follower (unity gain buffer) using an ideal op-amp?

For maximum power transfer from a source with internal resistance Rs to load RL, what should be the condition?

What is the input offset voltage of a typical precision op-amp (like OP07)?

What is the slew rate of a standard 741 op-amp?

What is the gain-bandwidth product (GBW) of a typical 741 op-amp?

What is the bandwidth of a first-order low-pass filter with cutoff frequency fc = 1 kHz?