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Test: (Junction Field Effect Transistor) JFET - 1


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10 Questions MCQ Test Analog Electronics | Test: (Junction Field Effect Transistor) JFET - 1

Test: (Junction Field Effect Transistor) JFET - 1 for Electronics and Communication Engineering (ECE) 2023 is part of Analog Electronics preparation. The Test: (Junction Field Effect Transistor) JFET - 1 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: (Junction Field Effect Transistor) JFET - 1 MCQs are made for Electronics and Communication Engineering (ECE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: (Junction Field Effect Transistor) JFET - 1 below.
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Test: (Junction Field Effect Transistor) JFET - 1 - Question 1

Comparing the size of BJT and FET, choose the correct statement?

Detailed Solution for Test: (Junction Field Effect Transistor) JFET - 1 - Question 1

BJT usually are built with a thickness of up to 1cm whereas the FET uses a fabrication technique which makes its size in mm.

Test: (Junction Field Effect Transistor) JFET - 1 - Question 2

For a FET when will maximum current flows?

Detailed Solution for Test: (Junction Field Effect Transistor) JFET - 1 - Question 2

For a FET the current reaches maximum that is IDSS occurs when Vgs = 0V and VDS > = |Vp|

Test: (Junction Field Effect Transistor) JFET - 1 - Question 3

The Shockley equation is _________

Detailed Solution for Test: (Junction Field Effect Transistor) JFET - 1 - Question 3

By using the diode equation Shockley derived the equation between the drain current and voltage Vgs.

Test: (Junction Field Effect Transistor) JFET - 1 - Question 4

To use FET as a voltage controlled resistor, in which region it should operate?

Detailed Solution for Test: (Junction Field Effect Transistor) JFET - 1 - Question 4

By varying the gate to source voltage, Resistance can be varied as follows rd = ro/(1-Vgs/Vp)2

Test: (Junction Field Effect Transistor) JFET - 1 - Question 5

For a p-channel FET, What is the direction of current flow?

Detailed Solution for Test: (Junction Field Effect Transistor) JFET - 1 - Question 5

When the voltage is lesser than pinch off, the current flows from Source to Drain.
The forward bias drain and gate is the reason for the flow of electron from Drain to source, as the conventional current flows opposite to the electron flow, the current will flow from Source to Drain.

Test: (Junction Field Effect Transistor) JFET - 1 - Question 6

Which of the following statement is true about FET?

Detailed Solution for Test: (Junction Field Effect Transistor) JFET - 1 - Question 6

Because of the Sio2 insulator, doped between drain and source at the top, the resistance offered by this is very high. The insulator will stop the flow of electron from one part to another which acts as an open circuit.

Test: (Junction Field Effect Transistor) JFET - 1 - Question 7

What is the main advantage of FET which makes it more useful in industrial applications?

Detailed Solution for Test: (Junction Field Effect Transistor) JFET - 1 - Question 7

Because of its small size, the IC chips can be made even smaller which reduces the wear and tear. The process technology used with process technology constant a which is the ratio of Width and Length, the FET is made more advantageous.

Test: (Junction Field Effect Transistor) JFET - 1 - Question 8

What is the value of current when the gate to source voltage is less than the pinch off voltage?

Detailed Solution for Test: (Junction Field Effect Transistor) JFET - 1 - Question 8

When the gate to source voltage is less than pinch off, both of the junctions will be reverse biased and hence no current flows.

Test: (Junction Field Effect Transistor) JFET - 1 - Question 9

What is the value of drain current when Vgs=pinch off voltage?

Detailed Solution for Test: (Junction Field Effect Transistor) JFET - 1 - Question 9

ID = IDSS (1-Vgs/Vp)2
If Vgs = Vp,then
ID = IDSS (1-1)=0.

Test: (Junction Field Effect Transistor) JFET - 1 - Question 10

For an n-channel FET, What is the direction of current flow?

Detailed Solution for Test: (Junction Field Effect Transistor) JFET - 1 - Question 10

When a voltage greater than pinch off is applied, the current starts flowing from Drain to source.

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