In the following circuit, the transistor is in active mode and . To get , we replace  with . Then the ratio  is _______________.

Transformer and emitter follower can both be used for impedance matching at the output of an audio amplifier. The basic relationship between the input power  and output power  in both the cases is

The input signal  shown in the figure is a 1 kHz square wave voltage that alternates between +7V and −7V with a 50% duty cycle. Both transistors have the same current gain, which is large. The circuit delivers power to the load resistor . What is the efficiency of this circuit for the given input?  Choose the closest answer.

In the single-stage transistor amplifier circuit shown in Fig., the capacitor  is removed.  Then the ac small-signal mid-band voltage gain of the amplifier.

In the transistor amplifier shown in figure, the ratio of small signal voltage gain, when the emitter resistor , is bypassed by the capacitor  to when it is not bypassed, (assuming simplified approximate h-parameter model for transistor), is

In a Common Emitter amplifier, the un-bypassed emitter resistance provides

In an RC-coupled Common Emitter amplifier, which of the following is true?