Virtual Labs

Output characteristics of an n-channel MOSFET

1. What is the output characteristic of an n-channel MOSFET?

a: Variation of drain current with gate voltage Explanation

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b: Variation of drain current with drain-to-source voltage Explanation

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c: Variation of gate current with drain voltage Explanation

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d: Variation of gate-to-source voltage with temperature Explanation

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2. In which region does the n-channel MOSFET behave like a variable resistor?

a: Cutoff region Explanation

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b: Linear (ohmic) region Explanation

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c: Saturation region Explanation

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d: Breakdown region Explanation

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3. What happens to the MOSFET in the cutoff region?

a: The drain current is maximum Explanation

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b: The MOSFET acts as a short circuit Explanation

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c: The drain current is negligible or zero Explanation

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d: The gate current increases rapidly Explanation

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4. What condition defines the onset of the saturation region in an n-channel MOSFET?

a: V_DS > V_G - V_T Explanation

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b: V_DS < V_G - V_T Explanation

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c: V_G < V_T Explanation

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d: V_G = 0 Explanation

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5. What is the primary factor controlling the drain current in the saturation region?

a: Drain voltage Explanation

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b: Gate voltage Explanation

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c: Source current Explanation

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d: Oxide thickness Explanation

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6. What is the role of the threshold voltage (V_T) in an n-channel MOSFET?

a: It determines the maximum drain current Explanation

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b: It indicates the onset of conduction between drain and source Explanation

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c: It controls the source current Explanation

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d: It adjusts the gate-to-drain capacitance Explanation

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7. How does the drain current (I_D) vary with V_DS in the saturation region?

a: It increases linearly Explanation

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b: It remains nearly constant Explanation

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c: It decreases exponentially Explanation

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d: It oscillates with frequency Explanation

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8. Which parameter primarily influences the mobility (μ) in a MOSFET?

a: Temperature Explanation

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b: Drain voltage Explanation

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c: Gate width Explanation

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d: Source resistance Explanation

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9. What happens to the n-channel MOSFET when V_G < V_T?

a: The drain current increases exponentially Explanation

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b: The MOSFET enters the linear region Explanation

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c: The channel does not form, and the MOSFET remains off Explanation

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d: The source voltage becomes negative Explanation

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10. In which application is the n-channel MOSFET typically used in the saturation region?

a: Voltage regulator Explanation

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b: Switching circuit Explanation

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c: Digital logic inverter Explanation

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d: Analog amplifier Explanation

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