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Test: FET Amplifier - 1 - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: FET Amplifier - 1

Test: FET Amplifier - 1 for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: FET Amplifier - 1 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: FET Amplifier - 1 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: FET Amplifier - 1 below.
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Test: FET Amplifier - 1 - Question 1

Ideal maximum voltage for common drain amplifier is _________

Detailed Solution for Test: FET Amplifier - 1 - Question 1

Similar to the transistor emitter follower, the source follower configuration itself provides a high level of buffering and a high input impedance. The actual input resistance of the FET itself is very high as it is a field effect device. This means that the source follower circuit is able to provide excellent performance as a buffer. The voltage gain is unity, although current gain is high. The input and output signals are in phase.

Test: FET Amplifier - 1 - Question 2

Input resistance of common gate of the amplifier is __________

Detailed Solution for Test: FET Amplifier - 1 - Question 2

For a Common gate amplifier, Current gain is about unity, input resistance is low, output resistance is high a CG stage is a current “buffer”. It takes a current at the input that may have a relatively small Norton equivalent resistance and replicates it at the output port, which is a good current source due to the high output resistance.

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Test: FET Amplifier - 1 - Question 3

Voltage gain of common drain amplifier is always slightly less than _____

Detailed Solution for Test: FET Amplifier - 1 - Question 3

In common drain amplifier
Writing KCL at the source node ;
Gm(vin – vout) – gmbs vout – gds vout = 0
vout vin = Gm / Gm + Gmbs + gds
Therefore gain is less than one.

Test: FET Amplifier - 1 - Question 4

D-MOSFET in case of common source amplifier can operate with gate to source voltage zero at ______

Detailed Solution for Test: FET Amplifier - 1 - Question 4

Q-point” needs to be found for the correct biasing of the JFET amplifier circuit with single amplifier configurations of Common-source, Common-drain or Source-follower and the Common-gate available for most FET devices.

Test: FET Amplifier - 1 - Question 5

The drain of FET is analogous to BJT

Detailed Solution for Test: FET Amplifier - 1 - Question 5

A common collector amplifier (also known as an emitter follower) is one of three basic single-stage bipolar junction transistor (BJT) amplifier, typically used as a voltage buffer.
In this circuit the base terminal of the transistor serves as the input, the emitter is the output, and the collector is common to both. The analogous field-effect transistor circuit is the common drain amplifier and the analogous tube circuit is the cathode follower.

Test: FET Amplifier - 1 - Question 6

If a certain drain JFET has a transconductance of 4ms. And has external drain resistance of 1.5 ohm than ideal voltage gain will be _________

Detailed Solution for Test: FET Amplifier - 1 - Question 6

The transconductance, gm is defined as
gm =  ΔID / ΔVGS
so gm = Voltage gain / RD
Therefore, voltage gain = gm  x  RD
= 4  x 1.5
= 6.

Test: FET Amplifier - 1 - Question 7

A FET circuit has a transconductance of 2500 µ seconds and drain resistance equals to 10Kohms than voltage gain will be __________

Detailed Solution for Test: FET Amplifier - 1 - Question 7

The transconductance, gm is defined as
gm = ΔID / ΔVGS
so gm = Voltage gain / RD
Therefore, voltage gain = gm x  RD
= 2500 x 10-6 x 10 x 103
= 25.

Test: FET Amplifier - 1 - Question 8

A common gate amplifier has _______

Detailed Solution for Test: FET Amplifier - 1 - Question 8

Common gate amplifier just like common base amplifier had a very large voltage gain but input impedance is very low. Also, it gives unity current gain. Hence, the power of the amplified signal will be less.

Test: FET Amplifier - 1 - Question 9

A common source amplifier has _______

Detailed Solution for Test: FET Amplifier - 1 - Question 9

In a common source amplifier the source resistance is connected to the ground(i.e. is grounded) because of which its source resistance is kept zero.

Test: FET Amplifier - 1 - Question 10

Input signal of common drain amplifier is applied to the gate through ________

Detailed Solution for Test: FET Amplifier - 1 - Question 10

A common-drain amplifier is also called a source-follower. Self-biasing is used in this particular circuit. The input signal is applied to the gate through a coupling capacitor, and the output signal is coupled to the load resistor through the other capacitor.

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