# Maharashtra PSC Exam: Electronics MCQs (Practice_Test 7 of 13)

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- An ideal OP-AMP is an ideal
- Current controlled Current source
- Current controlled Voltage source
- Voltage controlled Voltage source
- Voltage controlled Current source

Answer: b

- A 741-Type OP-AMP has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit-3db bandwidth of
- 50KHz
- 100KHz
- KHz
- . 07KHz

Answer: a

- An amplifier using an opamp with slew rate SR = 1v/sec has a gain of 40db. If this amplifier has to faithfully amplify sinusoidal signals from dc to 20KHz without introducing any slew-rate induced distortion, then the input signal level exceed
- 795mV
- 395mV
- 795mV
- 39.5mV

Answer: c

- The ideal OP-AMP has the following characteristics
- Ri = ∞ A = ∞ R0 = 0
- Ri = 0, A = ∞ R0 = 0
- Ri = ∞ A = ∞ R0 = ∞
- Ri = 0, A = ∞ R0 = ∞

Answer: b

- The approximate input impedance of the opamp circuit which has Ri = 10k, Rf = 100k, RL = 10k
- ∞
- 120k
- 110k
- 10k

Answer: c

- An opamp has a slew rate of 5V/S. The largest sine wave o/p voltage possible at a frequency of 1MHz is
- 10 V
- 5 V
- 5V
- V

Answer: a

- Assume that the op-amp of the fig. Is ideal. If Vi is a triangular wave, then V0 will be
- square wave
- Triangular wave
- Parabolic wave
- Sine wave

- A differential amplifier is invariably used in the i/p stage of all op-amps. This is done basically to provide the op-amps with a very high
- CMMR
- bandwidth
- slew rate
- open-loop gain

Answer: c

- A differential amplifier has a differential gain of 20,000. CMMR = 80dB. The common mode gain is given by
- 2
- 1
- 0

Answer: c

- In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is
- 23dB
- 25dB
- 46dB
- 50dB

Answer: b