operational-amplifiers electronics question and answers -Page 6

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Operational Amplifiers problems

1. An inverting amplifier has a phase shift of 180� from input to output.
Options
A. True
B. False

Correct Answer: True

2. If an input signal is applied to the inverting input of an op-amp with the noninverting input grounded, the output signal would be opposite in polarity to the input.
Options
A. True
B. False

Correct Answer: True

3. If the two inputs to a differential amplifier are exactly the same, then the output is the signal multiplied by 2.
Options
A. True
B. False

Correct Answer: False

4. The ideal output impedance for an operational amplifier is 0 Ω.
Options
A. True
B. False

Correct Answer: True

5. Crystal oscillator circuits have a very low Q.
Options
A. True
B. False

Correct Answer: False

6. Feedback is used in an open-loop operational amplifier circuit.
Options
A. True
B. False

Correct Answer: False

7. An astable multivibrator has two states.
Options
A. True
B. False

Correct Answer: True

8. The feedback resistor adds to the gain of an op-amp.
Options
A. True
B. False

Correct Answer: False

9. It takes 4 µs for the output voltage of an op-amp to rise from ?14 V to +14 V. The slew rate of this op-amp is 3.5 V/µs.
Options
A. True
B. False

Correct Answer: False

10. In a common-mode input to an op-amp, both inputs are connected to the same signal source.
Options
A. True
B. False

Correct Answer: True

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