MCQOPTIONS
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MCQOPTIONS
This section includes 35 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The voltage gain of an OTA can be calculated using the formula |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» C. [C]. | |
| 2. |
A constant-current source delivers a load current that remains constant only when the load resistance remains constant. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
In an isolation amplifier, the third op-amp is used as a unity-gain differential amplifier. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
Instrumentation amplifiers are commonly used in environments with high common-mode noise. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
One of the key characteristics of an instrumentation amplifier is high input impedance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
If an operational transconductance amplifier (OTA) is used as an amplitude modulator, the voltage gain is varied by applying a _________ voltage to the ______ input. |
| A. | demodulation, bias |
| B. | modulation, bias |
| C. | bias, modulation |
| D. | low-frequency, bias |
| Answer» C. bias, modulation | |
| 7. |
An instrumentation amplifier has extremely high ________, good ________, and high ________. |
| A. | input impedance, common-mode rejection, gain |
| B. | noise factor, grounding, power |
| C. | working voltages, current capacity, output impedance |
| D. | output gain, output loading, power |
| Answer» B. noise factor, grounding, power | |
| 8. |
Clampers are often called peak detectors. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 9. |
To construct an instrumentation amplifier, two op-amps and seven resistors are needed. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 10. |
The external resistor of a typical instrumentation amplifier is used to set the ________. |
| A. | impedance |
| B. | rejection ratio |
| C. | gain |
| D. | isolation |
| Answer» D. isolation | |
| 11. |
An OTA is primarily a current-to-voltage amplifier. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 12. |
The ________ amplifier is ideal for amplitude modulation since its gain is current-controlled. |
| A. | log |
| B. | operational transconductance |
| C. | isolation |
| D. | Schmitt |
| Answer» C. isolation | |
| 13. |
One of the principal areas of application for an isolation amplifier is power plant instrumentation. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 14. |
In the classic three-op-amp instrumentation amplifier, the differential voltage gain is usually produced by the |
| A. | first stage |
| B. | second stage |
| C. | mismatched resistors |
| D. | output op-amp |
| Answer» B. second stage | |
| 15. |
A Schmitt trigger has _________. |
| A. | no trigger points |
| B. | one trigger point |
| C. | two trigger points |
| D. | three trigger points |
| Answer» E. | |
| 16. |
An isolation amplifier provides ac isolation between input and output. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 17. |
OTA stands for Operational Transistor Amplifier. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 18. |
Refer to Figure 20-2. This circuit is a setup for |
| A. | an antilog amplifier |
| B. | a constant-current source |
| C. | an instrumentation amplifier |
| D. | an isolation amplifier |
| Answer» C. an instrumentation amplifier | |
| 19. |
A Schmitt trigger is a comparator with _______. |
| A. | modulation |
| B. | a closed-loop gain less than one |
| C. | hysteresis |
| D. | a high threshold value |
| Answer» D. a high threshold value | |
| 20. |
Circuits that shift the dc level of a signal are called |
| A. | limiters |
| B. | clampers |
| C. | peak detectors |
| D. | dc converters |
| Answer» C. peak detectors | |
| 21. |
The precision rectifier circuit is designed to _________. |
| A. | rectify waveforms with very large voltage swings |
| B. | rectify waveforms with very small voltage swings |
| C. | rectify precision waveforms |
| D. | amplify and rectify waveforms |
| Answer» C. rectify precision waveforms | |
| 22. |
A voltage-to-current converter is used in applications where it's necessary to have an output load current that is controlled by _________. |
| A. | input frequency |
| B. | output resistance |
| C. | input voltage |
| D. | input resistance |
| Answer» D. input resistance | |
| 23. |
Isolation amps are named as such because they are sealed for protection from outside environmental damage. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 24. |
A(n) ________ amplifier is used if the application requires a high sensitivity to low-level signals and protection from high-voltage associated circuits. |
| A. | basic instrumentation |
| B. | operational transconductance |
| C. | log/antilog amplifier |
| D. | isolation |
| Answer» E. | |
| 25. |
The main purpose of an instrumentation amplifier is to amplify small signals riding on large common-mode voltages. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 26. |
An instrumentation amplifier has a high |
| A. | output impedance |
| B. | power gain |
| C. | CMRR |
| D. | supply voltage |
| Answer» D. supply voltage | |
| 27. |
The gain of an OTA is the ratio of the output current to the input voltage, and is measured in _____________. |
| A. | amps |
| B. | volts |
| C. | siemens |
| D. | no units |
| Answer» D. no units | |
| 28. |
Typical isolation amplifiers use optical coupling. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 29. |
The basic instrumentation amplifier has ________ input(s). |
| A. | 1 |
| B. | 2 |
| C. | capacitive |
| D. | resistive |
| Answer» C. capacitive | |
| 30. |
The primary function of the oscillator in an isolation amplifier is to |
| A. | convert dc to high-frequency ac |
| B. | convert dc to low-frequency ac |
| C. | rectify high-frequency ac to dc |
| D. | produce dual-polarity dc voltages for the input to the demodulator |
| Answer» B. convert dc to low-frequency ac | |
| 31. |
Which circuit is known as a voltage-to-current converter? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» C. c | |
| 32. |
This circuit is a setup for |
| A. | an antilog amplifier |
| B. | a constant-current source |
| C. | an instrumentation amplifier |
| D. | an isolation amplifier |
| Answer» D. an isolation amplifier | |
| 33. |
Refer the given circuits. Which circuit is known as an OTA? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» E. | |
| 34. |
When using an OTA in a Schmitt-trigger configuration, the trigger points are controlled by |
| A. | the Iout |
| B. | the IBIAS |
| C. | the Vout |
| D. | both Iout and IBIAS |
| Answer» E. | |
| 35. |
Which circuit is known as a current-to-voltage converter? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» B. b | |