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# Test: Amplifiers

## 10 Questions MCQ Test RRB JE for Electronics & Communication Engineering | Test: Amplifiers

Description
This mock test of Test: Amplifiers for Railways helps you for every Railways entrance exam. This contains 10 Multiple Choice Questions for Railways Test: Amplifiers (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Amplifiers quiz give you a good mix of easy questions and tough questions. Railways students definitely take this Test: Amplifiers exercise for a better result in the exam. You can find other Test: Amplifiers extra questions, long questions & short questions for Railways on EduRev as well by searching above.
QUESTION: 1

Solution:
QUESTION: 2

Solution:

QUESTION: 3

### Consider the circuit of fig. The transistor parameters are  β = 120 and VA = ∞ Que: The small signal votlage gain Av = vo/vs

Solution:

QUESTION: 4

The nominal quiescent collector current of a transistor is 1.2 mA. If the range of β for this transistor is 80 ≤ β ≤ 120 and if the quiescent collector current changes by +-10 percent, the range in value for rπ is

Solution:

QUESTION: 5

Consider the circuit in fig. The transistor parameter are β = 100 and VA = ∞.

If Q-point is in the center of the load line and ICQ = 0.5 mA, the values of VBB and RC are

Solution:

QUESTION: 6

Consider the common Base amplifier shown in fig. The parameters are β = 100, gm = 2 mS and ro = 250 kΩ. Find the Thevenin equivalent faced by load resistance RL .

Que: The Thevenin voltage vTH is

Solution:

The equivalent circuit is shown below

QUESTION: 7

Consider the common Base amplifier shown in fig. The parameters are gm = 2 mS and ro = 250 kΩ. Find the Thevenin equivalent faced by load resistance RL .

Que: The Thevenin equivalent resistance RTH is

Solution:

The equivalent small-signal circuit is shown in fig.

QUESTION: 8

The common-base amplifier is drawn as a two-port in fig. The parameters are β =100, gm = 3 mS, and ro =  800 kΩ.

Que: The h-parameter h21 is

Solution:

The equivalent small-signal circuit is shown in fig.

QUESTION: 9

The common-base amplifier is drawn as a two-port in fig. The parameters are β =100, gm = 3 mS, and ro =  800 kΩ.

Que: The h-parameter h12 is

Solution:

QUESTION: 10

Consider the source-follower circuit in fig. The values of parameter are gm = 2 mS and ro = 100 kΩ.

Que: The voltage gain Av is

Solution:

The small-signal equivalent circuit is shown in fig.