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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Topicwise Question Bank for Electrical Engineering  >  Test: Basic FET Amplifiers- 2 - Electrical Engineering (EE) MCQ

Test: Basic FET Amplifiers- 2 - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test Topicwise Question Bank for Electrical Engineering - Test: Basic FET Amplifiers- 2

Test: Basic FET Amplifiers- 2 for Electrical Engineering (EE) 2024 is part of Topicwise Question Bank for Electrical Engineering preparation. The Test: Basic FET Amplifiers- 2 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Basic FET Amplifiers- 2 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Basic FET Amplifiers- 2 below.
Solutions of Test: Basic FET Amplifiers- 2 questions in English are available as part of our Topicwise Question Bank for Electrical Engineering for Electrical Engineering (EE) & Test: Basic FET Amplifiers- 2 solutions in Hindi for Topicwise Question Bank for Electrical Engineering course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt Test: Basic FET Amplifiers- 2 | 10 questions in 30 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study Topicwise Question Bank for Electrical Engineering for Electrical Engineering (EE) Exam | Download free PDF with solutions
Test: Basic FET Amplifiers- 2 - Question 1
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In the common drain amplifier shown below, if RS = 4 KΩ, RG = 10 MΩ, μ = 50 and rd = 35 KΩ then the voltage gain Av of the amplifier is approximately equal to

Detailed Solution for Test: Basic FET Amplifiers- 2 - Question 1

The small signal equivalent circuit of common-drain amplifier is shown below.

Using Thevenin’s theorem, the output voltage is


(where, Vgd = Vi = input voltage)
∴ Voltage gain is

Test: Basic FET Amplifiers- 2 - Question 2
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The value of V0/Vin for the circuit shown below is (Assume M1 in saturation)

Detailed Solution for Test: Basic FET Amplifiers- 2 - Question 2

M2 is also saturated because its gate and drain are shorted together. The small signal circuit is shown below:

Here, 
For most MOSFET transistor, rd1 and d2 are much greater than 1/gm2.
Hence, 
Now, 
∴ 
= Required voltage gain

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Test: Basic FET Amplifiers- 2 - Question 3
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Consider the following statements:
1. In most linear applications of field-effect transistors the device is operated in the. constant-current portion of its output characteristics.
2. In the region before pinch-off, where VDS is small, the FET is useful as a voltage variable resistors (VVR).
3. The VVR can be used in AGC amplifier to vary the voltage gain of multistage amplifier.

Q. Which of the above statements is/are correct?

Test: Basic FET Amplifiers- 2 - Question 4
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In the saturation region, the ID - VGS characteristics of a MOSFET are
Detailed Solution for Test: Basic FET Amplifiers- 2 - Question 4

For amplifier operation, MOSFET is always operated in saturation region.
Since, in saturation region,therefore the ID - VGS characteristics of a MOSFET are quadratic as evident from the above equation.

Test: Basic FET Amplifiers- 2 - Question 5
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The source-bias circuit provides DC biasing for the FET. The resistance from gate to ground (RS) in that circuit is necessary because, without it,
Test: Basic FET Amplifiers- 2 - Question 6
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In an FET common-source high frequency amplifier, which one of the following is the correct expression for input capacitance Ci ?
Test: Basic FET Amplifiers- 2 - Question 7
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A JFET is set up as a source follower. Given, μ = 200, rd = 100 kΩ and source load resistance RL = 1 kΩ. The output resistance R0 is given approximately by
Detailed Solution for Test: Basic FET Amplifiers- 2 - Question 7

We know that,
μ = gmrd
or, 
Output resistance,

Test: Basic FET Amplifiers- 2 - Question 8
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A FET tuned amplifier with gm = 5 mA/V, rd = 20 kΩ has a resonant impedance of 20 kΩ. The gain at resonance is given by
Detailed Solution for Test: Basic FET Amplifiers- 2 - Question 8

AV = Gain at resonance = gmR
Here, R = rd ║Rmax 

∴ AV = 5x 10-3 x 10 x 103 = 50

Test: Basic FET Amplifiers- 2 - Question 9
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The unity gain bandwidth fT of a JFET is given by
Test: Basic FET Amplifiers- 2 - Question 10
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 The transconductance for a JFET having  IDSS = 8 mA, VP = -4 V and biased to operate at VGS = - 1.8 volt will be given by
Detailed Solution for Test: Basic FET Amplifiers- 2 - Question 10


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