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.

Both have the same voltage gain

None as neither combination is able to amplify the input signal

Explore topic-wise MCQs in Electronic Devices and Circuits Questions and Answers.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices and Circuits Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.	The ratio of the open circuit voltage of a voltage amplifier (AV) to the short circuit transconductance of a (Gm) of a transconductance amplifier, given that both have the same value of the internal resistance (Ri) and the output resistance (R0), is
A.	Ri
B.	R0
C.	1/Ri
D.	1/R0
Answer» C. 1/Ri

Discussion

2.	The ratio of the short circuit current gain of a current amplifier (Ai) to the open circuit voltage gain of a voltage amplifier (AV), given that both amplifiers have the same value of the input resistance (Ri) and output resistance (R0), is
A.	Ri
B.	Ro
C.	Ri / R0
D.	Ro / Ri
Answer» D. Ro / Ri

Discussion

3.	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.
A.	18.05 V/V
B.	19.05 V/V
C.	20.05 V/V
D.	21.05V/V
Answer» C. 20.05 V/V

Discussion

4.	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.	SABL
B.	SBAL
C.	Both have the same voltage gain
D.	None as neither combination is able to amplify the input signal
Answer» B. SBAL

Discussion

5.	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?
A.	50Ω
B.	200Ω
C.	250Ω
D.	350Ω
Answer» D. 350Ω

Discussion

6.	An amplifier has a voltage gain of 40db. The value of AVO is
A.	10
B.	100
C.	20
D.	200
Answer» C. 20

Discussion

Explore topic-wise MCQs in Electronic Devices and Circuits Questions and Answers.

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

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

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 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?

An amplifier has a voltage gain of 40db. The value of AVO is