MCQOPTIONS
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MCQOPTIONS
This section includes 23 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When a step-input is given to an op-amp integrator, the output will be______________? |
| A. | A ramp |
| B. | A sinusoidal wave |
| C. | A rectangular wave |
| D. | A triangular wave with dc bias |
| Answer» B. A sinusoidal wave | |
| 2. |
The two input terminals of an opamp are labeled as______________? |
| A. | High and low |
| B. | Positive and negative |
| C. | Inverting and non inverting |
| D. | Differential ans non differential |
| Answer» D. Differential ans non differential | |
| 3. |
The output voltage Vo of the above circuit is____________? |
| A. | -6V |
| B. | -5V |
| C. | -1.2V |
| D. | -0.2V |
| Answer» C. -1.2V | |
| 4. |
The closed-loop voltage gain of an inverting amplifier equal to______________? |
| A. | The ratio of the input resistance to feedback resistance |
| B. | The open-loop voltage gain |
| C. | The feedback resistance divided by the input resistance |
| D. | The input resistance |
| Answer» D. The input resistance | |
| 5. |
The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k? |
| A. | ∞ |
| B. | 120k |
| C. | 110k |
| D. | 10k |
| Answer» D. 10k | |
| 6. |
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________________? |
| A. | 23dB |
| B. | 25dB |
| C. | 46dB |
| D. | 50dB |
| Answer» B. 25dB | |
| 7. |
In the above circuit the current ix is___________? |
| A. | 0.6A |
| B. | 0.5A |
| C. | 0.2A |
| D. | 1/12A |
| Answer» C. 0.2A | |
| 8. |
If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will_____________? |
| A. | Not need an input resistor |
| B. | Be virtual ground |
| C. | Have high reverse current |
| D. | Not invert the signal |
| Answer» C. Have high reverse current | |
| 9. |
Hysteresis is desirable in Schmitt-trigger, because______________? |
| A. | Energy is to be stored/discharged in parasitic capacitances |
| B. | Effects of temperature would be compensated |
| C. | Devices in the circuit should be allowed time for saturation and desaturation |
| D. | It would prevent noise from causing false triggering |
| Answer» D. It would prevent noise from causing false triggering | |
| 10. |
How many op-amps are required to implement this equationop-amps? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 1 |
| Answer» E. | |
| 11. |
How many op-amps are required to implement this equation Vo = V1? |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» E. | |
| 12. |
For an op-amp having differential gain Av and common-mode gain Ac the CMRR is given by___________? |
| A. | Av + Ac |
| B. | Av / Ac |
| C. | 1 + Av / AC. |
| D. | Ac / Av |
| Answer» C. 1 + Av / AC. | |
| 13. |
Differential amplifiers are used in______________? |
| A. | Instrumentation amplifiers |
| B. | Voltage followers |
| C. | Voltage regulators |
| D. | Buffers |
| Answer» B. Voltage followers | |
| 14. |
Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5kΩ and C1 = 0.05μF___________? |
| A. | 1.273kHz |
| B. | 12.73kHz |
| C. | 127.3 kHz |
| D. | 127.3 Hz |
| Answer» B. 12.73kHz | |
| 15. |
Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be______________? |
| A. | Square wave |
| B. | Triangular wave |
| C. | Parabolic wave |
| D. | Sine wave |
| Answer» E. | |
| 16. |
An opamp has a slew rate of 5V/ S. the largest sine wave o/p voltage possible at a frequency of 1MHz is____________? |
| A. | 10 V |
| B. | 5 V |
| C. | 5V |
| D. | 5/2 V |
| Answer» B. 5 V | |
| 17. |
An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is_______________? |
| A. | 10 volts |
| B. | 5 volts |
| C. | 5/ volts |
| D. | 5/2 volts |
| Answer» E. | |
| 18. |
An ideal OP-AMP is an ideal______________? |
| A. | Current controlled Current source |
| B. | Current controlled voltage source |
| C. | Voltage controlled voltage source |
| D. | voltage controlled current source |
| Answer» D. voltage controlled current source | |
| 19. |
An ideal OP-AMP is an ideal__________? |
| A. | Current controlled Current source |
| B. | Current controlled Voltage source |
| C. | Voltage controlled Voltage source |
| D. | Voltage controlled Current source |
| Answer» D. Voltage controlled Current source | |
| 20. |
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_____________? |
| A. | 795mV |
| B. | 395mV |
| C. | 795mV |
| D. | 39.5mV |
| Answer» D. 39.5mV | |
| 21. |
A non inverting closed loop op amp circuit generally has a gain factor______________? |
| A. | Less than one |
| B. | Greater than one |
| C. | Of zero |
| D. | Equal to one |
| Answer» C. Of zero | |
| 22. |
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______________? |
| A. | CMMR |
| B. | Bandwidth |
| C. | Slew rate |
| D. | Open-loop gain |
| Answer» D. Open-loop gain | |
| 23. |
A differential amplifier has a differential gain of 20,000. CMMR=80dB. The common mode gain is given by_______________? |
| A. | 2 |
| B. | 1 |
| C. | 1/2 |
| D. | 0 |
| Answer» B. 1 | |