250+ TOP MCQs on MOSFETs Current-Voltage Characterisitcs and Answers

Electronic Devices and Circuits Multiple Choice Questions on “MOSFETs Current-Voltage Characterisitcs”.

1. If a MOSFET is to be used in the making of an amplifier then it must work in
A. Cut-off region
B. Triode region
C. Saturation region
D. Both cut-off and triode region can be used
Answer: C
Clarification: Only in the saturation region a MOSFET can operate as an amplifier.

2. For MOSFET is to be used as a switch then it must operate in
A. Cut-off region
B. Triode region
C. Saturation region
D. Both cut-off and triode region can be used
Answer: D
Clarification: In both regions it can perform the task of a switch.

(Q.3 & Q.4) Using the circuit shown below,
electronic-devices-circuits-questions-answers-mosfets-current-voltage-characterisitcs-q3″>
3. Determine the conditions in which the MOSFET is operating in the triode region.
i. V_GD > V_t (Threshold voltage)
ii. V_DS > V_OV
iii. I_D ∝ (V_OV – 0.5V_DS)V_DS

A. i, ii, and iii are correct
B. i and iii are correct
C. i and ii are correct
D. ii and iii are correct
Answer: B
Clarification: Only the points I and iii are correct and ii is false.

4. Determine the conditions in which the MOSFET is operating in the saturation region
i. V_GD > V_t (Threshold voltage)
ii. V_DS > V_OV
iii. I_D ∝ (V_OV)²

A. i, ii, and iii are correct
B. i and iii are correct
C. i and ii are correct
D. ii and iii are correct
Answer: D
Clarification: i is false and ii and iii are true.

5. In the saturation region of the MOSFET the saturation current is
A. Independent of the voltage difference between the source and the drain
B. Depends directly on the voltage difference between the source and the drain
C. Depends directly on the overdriving voltage
D. Depends directly on the voltage supplied to the gate terminal
Answer: A
Clarification: Saturation current does not depends on the voltage difference between the source and the drain in the saturation region of a MOSFET.

6. An n-channel MOSFET operating with V_OV=0.5V exhibits a linear resistance = 1 kΩ when V_DS is very small. What is the value of the device transconductance parameter k_n?
A. 2 mA/V²
B. 20 mA/V²
C. 0.2 A/V²
D. 2 A/V²
Answer: A
Clarification: Use the standard mathematical expression to determine the value of k_n.

7. An NMOS transistor is operating at the edge of saturation with an overdrive voltage V_OV and a drain current I_D. If is V_OV is doubled, and we must maintain operation at the edge of saturation, what value of drain current results?
A. 0.25I_D
B. 0.5I_D
C. 2I_D
D. 4I_D
Answer: C
Clarification: I₀ is directly proportional to V_OS.

(Q.8-Q.10) Using the circuit below answer the question
electronic-devices-circuits-questions-answers-mosfets-current-voltage-characterisitcs-q8″>
8. Which of the following is true for the triode region?
a. V_DG > V_tp
b. V_SD < V_OV
c. I_D ∝ V_OV
C. None of the mentioned
Answer: D
Clarification: V_DG > |V_tp| and V_SD < |V_OV|.

9. Which of the following is true for the saturation region?
A. V_DG ≤ |V_tp|
B. V_SD ≤| V_OV|
C. V_DG < |V_tp|
D. V_SD <| V_OV|
Answer: A
Clarification: It is a characteristic for the saturation region.

10. The current i_D
A. Depends linearly on V_OV in the saturation region
B. Depends on the square of V_OV in the saturation region
C. Depends inversely on V_OV in the triode region
D. None of the mentioned
Answer: B
Clarification: Use the standard mathematical expressions for i₀ in different regions.