Test: Circuit Models For Amplifier - UPSC MCQ

The output voltage of a voltage amplifier has been found to decrease by 20% when a load resistance of 1 kΩ is connected. What is the value of the amplifier output resistance?

Which of the following is a transresistance amplifier?

The signal to be amplified is current signal and the output desired is a voltage signal. Which of the following amplifier can perform this task?

You are given two amplifiers, A and B, to connect in cascade between a 10-mV, 100-kΩ source (S) and a 100-Ω load (L). The amplifiers have voltage gain, input resistance, and output resistance as follows: for A, 100 V/V, 10 kΩ, 10 kΩ, respectively; for B, 1 V/V, 100 kΩ, 100 Ω, respectively. Your problem is to decide how the amplifiers should be connected so that the voltage gain is maximum.

A transconductance amplifier with Ri = 2 kΩ, Gm = 40 mA/V, and Ro = 20 kΩ is fed with a voltage source having a source resistance of 2 kΩ and is loaded with a 1-kΩ resistance. Find the voltage gain realized.

The ratio of the short circuit current gain of a current amplifier (A_i) to the open circuit voltage gain of a voltage amplifier (A_V), given that both amplifiers have the same value of the input resistance (R_i) and output resistance (R₀), is

The ratio of the open circuit voltage of a voltage amplifier (A_V) to the short circuit transconductance of a (G_m) of a transconductance amplifier, given that both have the same value of the internal resistance (R_i) and the output resistance (R₀), is