GATE EC||ANALOG ELECTRONIC||OPERATIONAL AMPLIFIER||PYQS(2000-2025)

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Question 1

An ideal op-amp is an ideal

(GATE 2004|| EC || MCQ || 1 MARKS)

voltage controlled current source.
voltage controlled voltage source.
current controlled current source.
current controlled voltage source.

Question 2

If V_i = V₁ sin (ωt) and V₀ = V₂ sin (ωt + ϕ), then the minimum and maximum values of ϕ (in radians) are respectively

(GATE 2007|| EC || MCQ || 2 MARK)

[Tex]-\frac{\pi}{2} \quad \text{and} \quad \frac{\pi}{2}[/Tex]
[Tex]0 \quad \text{and} \quad \frac{\pi}{2}[/Tex]
[Tex]-\pi \quad \text{and} \quad 0[/Tex]
[Tex]-\frac{\pi}{2} \quad \text{and} \quad 0[/Tex]

Question 3

Consider the Op-Amp circuit shown in the figure.

The transfer function V₀(s)/V_i(s) is

(GATE 2007|| EC || MCQ || 2 MARK)

[Tex]\frac{1 - sRC}{1 + sRC}[/Tex]
[Tex]\frac{1 + sRC}{1 - sRC}[/Tex]
[Tex]\frac{1}{1 - sRC}[/Tex]
[Tex]\frac{1}{1 + sRC}[/Tex]

Question 4

In the OP-Amp circuit shown, assume that the diode current follows the equation I = Is exp (v/vt). For V_i = 2 V, V₀ = V₀₁, and for V_i = 4V, V₀ = V₀₂, The relationship between V₀₁ and V₀₂ is

[Tex]V_{o2} = \sqrt{2}\,V_{o1}[/Tex]
[Tex]V_{o2} = e^2 V_{01}[/Tex]
[Tex]V_{o2} = V_{o1}\ln 2[/Tex]
[Tex]V_{o1} - V_{o2} = V_T \ln 2[/Tex]

Question 5

For the Op-Amp circuit shown in the figure, V₀ is

(GATE 2007 || EC || MCQ || 2 MARK)

2 V
-1 V
-0.5 V
0.5 V

Question 6

For the circuit shown in the following figure, the capacitor C is initially uncharged. At t = 0, the switch S is closed. The voltage V_c across the capacitor at t = 1 millisecond is

For the circuit shown in the following figure, the capacitor C is initially uncharged. At t = 0, the switch S is closed. The voltage V_c across the capacitor at t = 1 millisecond is

(GATE 2006 || EC || MCQ || 2 MARK)