The JFET Volt-Ampere Characteristics MCQ’s

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This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “The JFET Volt-Ampere Characteristics”.

1. If a JFET with length L=10µm, a=2µm, W=8µm, Vp=-4V.What is the value of rds at Vgs = 0V?
a) 2KΩ
b) 5.2KΩ
c) 10KΩ
d) 9.8KΩ

2. A JFET has ID=10mA, IDSS=1A, Vp=-1v, what is the value of Vgs?
a) -0.9V
b) 1V
c) -1V
d) 0.5V

3. For low value of VDS, the JFET behaves like a __________
a) Voltage Variable Resistor
b) Constant Voltage Device
c) Amplifier
d) Switch

4. Where does the transfer curve lie for a p- channel FET?
a) First quadrant
b) Second quadrant
c) Third quadrant
d) Fourth quadrant

5. For a p-channel FET, the current ID at Vgs = 2V and Vds = 5V and Vgs = 3V was found to be 2mA, what will be the value of ID at Vgs = 0V and Vds = 5V?
a) 0A
b) 2mA
c) Lesser than 0A
d) Greater than 2mA

6. What is the value of resultant gm if two non identical FETs are connected in parallel?
a) (µ1 rd1 + µ2 rd2)/ (rd1+rd2)
b) (µ1 rd2 + µ2 rd1)/ (rd1+rd2)
c) 0
d) µ1 rd1+ µ2 rd2

7. For an n-channel FET, the current v at Vgs=-2V and Vds=5V was found to be 2mA, what will be the value of ID at Vgs=0V and Vds=5V?
a) 0A
b) 2mA
c) Lesser than 0A
d) Greater than 2mA

8. A FET is biased at ID = IDSS/4, at this point the value of trans conductance is __________________ (ID=10mA, Vp=-5V).
a) 1mA/V
b) 2mA/V
c) 3mA/V
d) 4mA/V

9. What will be the value of rd, if two identical FETs are connected in parallel?
a) Doubles
b) Reduces to half
c) 0
d) Infinite

10. What will be the value of trans conductance if two Identical FETs are connected in parallel?
a) Doubles
b) Reduces to half
c) 0
d) Infinite

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