# Competitive Exams: Electronics MCQs (Practice_Test 7 of 13)

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1. An ideal OP-AMP is an ideal
1. Current controlled Current source
2. Current controlled Voltage source
3. Voltage controlled Voltage source
4. Voltage controlled Current source

2. 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
1. 50KHz
2. 100KHz
3. KHz
4. . 07KHz

3. 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
1. 795mV
2. 395mV
3. 795mV
4. 39.5mV

4. The ideal OP-AMP has the following characteristics
1. Ri = ∞ A = ∞ R0 = 0
2. Ri = 0, A = ∞ R0 = 0
3. Ri = ∞ A = ∞ R0 = ∞
4. Ri = 0, A = ∞ R0 = ∞

5. The approximate input impedance of the opamp circuit which has Ri = 10k, Rf = 100k, RL = 10k
1. 120k
2. 110k
3. 10k

6. An opamp has a slew rate of 5V/S. The largest sine wave o/p voltage possible at a frequency of 1MHz is
1. 10 V
2. 5 V
3. 5V
4. V

7. Assume that the op-amp of the fig. Is ideal. If Vi is a triangular wave, then V0 will be
1. square wave
2. Triangular wave
3. Parabolic wave
4. Sine wave
8. 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
1. CMMR
2. bandwidth
3. slew rate
4. open-loop gain

9. A differential amplifier has a differential gain of 20,000. CMMR = 80dB. The common mode gain is given by
1. 2
2. 1
3. 0