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Field Effect Transistors - FET

Free 47+ Field Effect Transistors - FET MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Field Effect Transistors - FET — MCQs for Pakistan government job tests

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Field Effect Transistors - FET

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1.Which JFET configuration corresponds to the common base setup in a PNP transistor?

2.In a JFET, what does the term IDSS represent?

3.For a common-source JFET amplifier with RD = 1 kΩ, RS = 560 Ω, VDD = 10 V, and transconductance gm = 4500 µS, what is the voltage gain if the source resistor is fully bypassed?

4.For a p-channel enhancement-mode MOSFET with a threshold voltage (V_GS(th)) of -2V, what is the drain current when the gate-to-source voltage (V_GS) is 0V?

5.A D-MOSFET has a gate-to-source voltage (VGS) of 0 V. Given that the datasheet lists IDSS as 20 mA and VGS(off) as -5 V, what is the expected drain current (ID)?

6.What happens to the JFET channel when it reaches the cut-off condition?

7.If a JFET datasheet specifies the cutoff gate-source voltage (VGS(off)) as -4 V, what is the value of the pinch-off voltage (Vp)?

8.In a JFET, the source terminal is analogous to which part of a vacuum tube?

9.In a JFET, the channel is located between which two terminals?

10.The output behavior of a JFET is most similar to which type of vacuum tube?

11.How many p-n junctions are present on the sides of a Field Effect Transistor (FET)?

12.When VGS is 0 V, at what value of VDS does the drain current reach saturation?

13.What is the primary distinction between a MOSFET and a JFET?

14.In a common-source JFET amplifier configuration, how does the output voltage relate in phase to the input signal?

15.In a common-source JFET amplifier, the load resistance is 10 kΩ and the drain resistance (RD) is 820 Ω. Given the transconductance (gm) is 5 mS and the input voltage (Vin) is 500 mV, what is the output voltage of the amplifier?

16.For a typical common-source D-MOSFET amplifier, if the drain-source voltage (Vds) is 3.2 V rms and the gate-source voltage (Vgs) is 280 mV rms, what is the voltage gain of the amplifier?

17.A common-source JFET amplifier has a voltage gain of 10 when the source bypass capacitor is in place. What happens if this bypass capacitor is taken out?

18.What will happen to the output voltage if the load resistance mentioned in the previous question (Q.49) is disconnected?

19.An n-channel D-MOSFET with a positive gate-to-source voltage (VGS) is functioning in which mode?

20.Between which two points does the constant-current region of a JFET occur?

How to prepare with Field Effect Transistors - FET MCQs

  • Work through questions topic by topic, then revisit any you answered incorrectly.
  • Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
  • Pair subject practice with past papers to see how Field Effect Transistors - FET appears in real exam conditions.

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