QUIZ1D1 - B

1. In which of the following scenarios can an op-amp running in an open-loop configuration be used to amplify the signal?

a. A voltage with a mean of 1.0 V, and with superimposed noise with peak-to-peak amplitude of less than one microvolt

b. A distant radio signal with zero mean, and less than a microvolt peak-to-peak amplitude.

c. A voltage with zero mean, and a peak-to-peak amplitude of around 0.2 V.

d. A voltage with a mean of -1.0 V, and with superimposed noise with peak-to-peak amplitude of a few millivolts.

e. All of the above.

2. Which choice below best defines the purpose of a buffer (constructed with an op-amp)?

a. To invert the input signalb. To amplify the input signal. c. To invert and amplify the input signal.d. To isolate the input signal from the rest

of the circuit.e.To effectively increase the input

impedance of the op-amp.

3. Consider the following schematic diagram:

If Vi = 1.5 V, what is Vo (in volts)? a. 4.5kVb. 0.45Vc. 45kVd. 4.5Ve. 45V

4. An active load is used in the collector of differential amplifier of op – amp to

a.Increase the output resistanceb.Increase the differential gain Ad c.Increase maximum peak output voltaged.Eliminate load resistance from the circuit

5. The gain of op-amp decreases to high frequencies because of

a. resistance in the feedbackb. capacitor within op-ampc. feedback network with active deviced. none of the above

6. The important feature of instrumentation amplifiera. high CMRRb. high gain accuracyc. high gain stabilityd. all of the above

7. The maximum slew rate of IC 741 isa.0.1 V/μsb. 0.8 V/μsc. 1 V/μsd. 0.5 V/μs

8. In the Op – Amp circuit shown below, the current IL isa.Vi / ZL

b.Vi / ZL || R1

c.Vi / R1

d.Vi (ZL + R1)

9. Op – Amp integrators are not used because they

a.Produce noiseb.Use inductorsc.Amplifyd.None of the above

10. A Howland current source is one that is a

a.Voltage to current converterb.Current to voltage converterc.An isolation amplifierd.An ideal Op – Ampe.None of the above

1. In which of the following scenarios can an op-amp running in an open-loop configuration be used to amplify the signal?

a. A voltage with a mean of 1.0 V, and with superimposed noise with peak-to-peak amplitude of less than one microvolt

b. A distant radio signal with zero mean, and less than a microvolt peak-to-peak amplitude.

c. A voltage with zero mean, and a peak-to-peak amplitude of around 0.2 V.

d. A voltage with a mean of -1.0 V, and with superimposed noise with peak-to-peak amplitude of a few millivolts.

e. All of the above.

2. Which choice below best defines the purpose of a buffer (constructed with an op-amp)?

a. To invert the input signalb. To amplify the input signal. c. To invert and amplify the input signal.d. To isolate the input signal from the rest of

the circuit.e.To effectively increase the input

impedance of the op-amp.

3. Consider the following schematic diagram:

If Vi = 1.5 V, what is Vo (in volts)? a. 4.5kVb. 0.45Vc. 45kVd. 4.5Ve. 45V

4. An active load is used in the collector of differential amplifier of op – amp to

a.Increase the output resistanceb.Increase the differential gain Ad c.Increase maximum peak output voltaged.Eliminate load resistance from the circuit

5. The gain of op-amp decreases to high frequencies because of

a. resistance in the feedbackb. capacitor within op-ampc. feedback network with active deviced. none of the above

6. The important feature of instrumentation amplifiera. high CMRRb. high gain accuracyc. high gain stabilityd. all of the above

7. The maximum slew rate of IC 741 isa.0.1 V/μsb. 0.8 V/μsc. 1 V/μsd. 0.5 V/μs

8. In the Op – Amp circuit shown below, the current IL isa.Vi / ZL

b.Vi / ZL || R1

c.Vi / R1

d.Vi (ZL + R1)

9. Op – Amp integrators are not used because they

a.Produce noiseb.Use inductorsc.Amplifyd.None of the above

10. A Howland current source is one that is a

a.Voltage to current converterb.Current to voltage converterc.An isolation amplifierd.An ideal Op – Ampe.None of the above