Virtual Labs

Output characteristics of an n-channel MOSFET

1. What is the typical shape of the output characteristics curve for an n-channel MOSFET?

a: Straight line Explanation

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b: Exponential curve Explanation

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c: S-shaped curve Explanation

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d: Parabolic curve Explanation

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2. What is the effect of increasing gate voltage (V_G) on the drain current (I_D)?

a: I_D decreases Explanation

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b: I_D remains constant Explanation

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c: I_D increases Explanation

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d: I_D oscillates Explanation

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3. Which region of operation is suitable for digital switching applications in an n-channel MOSFET?

a: Cutoff region Explanation

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b: Saturation region Explanation

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c: Linear region Explanation

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d: All of the above Explanation

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4. In the linear region, how does the relationship between I_D and V_DS behave?

a: Linear relationship Explanation

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b: Quadratic relationship Explanation

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c: Inverse relationship Explanation

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d: Logarithmic relationship Explanation

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5. Which factor can cause the threshold voltage (V_T) to vary?

a: Temperature Explanation

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b: Substrate doping concentration Explanation

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c: Gate oxide thickness Explanation

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d: All of the above Explanation

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6. In the saturation region, what is the primary mode of operation for an n-channel MOSFET?

a: Current is controlled by gate voltage Explanation

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b: Current is controlled by drain voltage Explanation

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c: Current is controlled by temperature Explanation

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d: Current is controlled by source voltage Explanation

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7. What is the significance of the transconductance (g_m) in MOSFET operation?

a: It indicates the output voltage Explanation

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b: It indicates the input capacitance Explanation

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c: It indicates the change in drain current with gate voltage Explanation

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d: It indicates the change in source current with drain voltage Explanation

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8. What happens to the drain current (I_D) when the n-channel MOSFET is in the cutoff region?

a: I_D increases linearly Explanation

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b: I_D decreases to zero Explanation

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c: I_D remains constant at a value Explanation

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d: I_D becomes negative Explanation

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9. In terms of output characteristics, what does the term 'pinch-off' refer to?

a: The maximum voltage across the MOSFET Explanation

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b: The point where the channel is fully formed Explanation

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c: The point at which the current becomes constant despite increasing V_DS Explanation

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d: The minimum gate voltage needed to turn on the device Explanation

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10. Which device characteristic is essential for determining the MOSFET's power dissipation?

a: Threshold voltage Explanation

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b: Drain current Explanation

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c: On-resistance (R_on) Explanation

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d: Gate capacitance Explanation

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