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GATE ECE Gateece Analog — practice questions

Explore 4 free Gateece Analog questions in GATE ECE Electronics. Open each question or exercise to read its content, reference answers and available explanation.

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Gateece Analog questions and exercises with answers

Showing questions 1–4 of 4.

For an inverting amplifier with input resistor R1 and feedback resistor Rf, the closed-loop voltage gain is which?Read the answer and worked solution →The slew rate of an op-amp limits which signal characteristic?Read the answer and worked solution →A Wien-bridge oscillator using identical R and C in the frequency-selective branch oscillates at frequency f₀ equal to which?Read the answer and worked solution →In a bandgap voltage reference (Widlar topology), the output voltage equals which expression?Read the answer and worked solution →

Worked practice questions

For an inverting amplifier with input resistor R1 and feedback resistor Rf, the closed-loop voltage gain is which?

  1. A_v = +Rf/R1
  2. A_v = -Rf/R1
  3. A_v = R1 + Rf always
  4. A_v = R1/Rf with minus sign
Show answer and solution

Correct answer: B. A_v = -Rf/R1

Inverting config: virtual ground at V-, so I1 = Vin/R1 = -Vout/Rf ⟹ Vout/Vin = -Rf/R1. Independent of op-amp open-loop gain.

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The slew rate of an op-amp limits which signal characteristic?

  1. Maximum dV_out/dt the op-amp can deliver
  2. DC voltage gain at all frequencies
  3. Input bias current value
  4. Common-mode rejection ratio (CMRR)
Show answer and solution

Correct answer: A. Maximum dV_out/dt the op-amp can deliver

Slew rate SR = max |dV_out/dt|, set by internal compensation cap charging current. Large-signal effect distinct from small-signal bandwidth. Distorts fast edges.

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A Wien-bridge oscillator using identical R and C in the frequency-selective branch oscillates at frequency f₀ equal to which?

  1. f₀ = 1/(2π·R·C)
  2. f₀ = R·C/(2π) only
  3. f₀ = 1/(R+C) always
  4. f₀ = R·C² always
Show answer and solution

Correct answer: A. f₀ = 1/(2π·R·C)

Wien bridge: positive-feedback network passes f₀ = 1/(2πRC) with phase 0° and attenuation 1/3. Amp needs gain exactly 3 (Barkhausen) for sustained oscillation.

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