Opamp Circuits

21. 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=∞

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22. Which of the following amplifier is used in a digital to analog converter?

1. Non inverter
2. Voltage follower
3. Summer
4. Difference amplifier

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23. The output voltage Vo of the above circuit is

1. -6V
2. -5V
3. -1.2V
4. -0.2V

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24. The two input terminals of an opamp are labeled as

1. High and low
2. Positive and negative
3. Inverting and non inverting
4. Differential ans non differential

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25. When a step-input is given to an op-amp integrator, the output will be

1. A ramp.
2. A sinusoidal wave.
3. A rectangular wave.
4. A triangular wave with dc bias

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