Electronics (ECE) - MCQ Practice Questions

In a common emitter amplifier, the voltage gain is maximum when the load resistance is

The input impedance of a common base amplifier is

For maximum power transfer in an amplifier circuit, the load impedance should be

The bandwidth of a common emitter amplifier can be increased by

In a differential amplifier, the common mode rejection ratio (CMRR) is defined as

Which configuration provides the highest voltage gain among the three BJT amplifier configurations?

The input impedance of a voltage follower (common collector) amplifier is

At what frequency does the gain of a RC coupled amplifier reduce to 70.7% of its mid-band gain?

In an RC coupled amplifier, the lower cutoff frequency is primarily determined by

The Miller effect in a common emitter amplifier causes

For a feedback amplifier with feedback fraction β, the loop gain is defined as

Negative feedback in an amplifier primarily results in

In a Class A amplifier, the maximum theoretical efficiency is

The Barkhausen criterion for oscillation states that

In a Colpitts oscillator, the frequency of oscillation is determined by

An ideal operational amplifier has the following characteristics EXCEPT

In a non-inverting amplifier configuration with feedback resistors RF and Ri, the voltage gain is

The gain-bandwidth product (GBP) of an op-amp is approximately constant. For a 741 op-amp with GBP ≈ 1 MHz, the open-loop gain at 100 kHz is approximately

In a saturated BJT transistor used as a switch, the voltage drop VCE(sat) is typically

Which statement about thermal stability in BJT amplifiers is CORRECT?