MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The ratio of the open circuit voltage of a voltage amplifier (AV) to the short circuit transconductance of a (Gm) of a transconductance amplifier, given that both have the same value of the internal resistance (Ri) and the output resistance (R0), is |
| A. | Ri |
| B. | R0 |
| C. | 1/Ri |
| D. | 1/R0 |
| Answer» C. 1/Ri | |
| 2. |
The ratio of the short circuit current gain of a current amplifier (Ai) to the open circuit voltage gain of a voltage amplifier (AV), given that both amplifiers have the same value of the input resistance (Ri) and output resistance (R0), is |
| A. | Ri |
| B. | Ro |
| C. | Ri / R0 |
| D. | Ro / Ri |
| Answer» D. Ro / Ri | |
| 3. |
A transconductance amplifier with Ri = 2 kΩ, Gm = 40 mA/V, and Ro = 20 kΩ is fed with a voltage source having a source resistance of 2 kΩ and is loaded with a 1-kΩ resistance. Find the voltage gain realized. |
| A. | 18.05 V/V |
| B. | 19.05 V/V |
| C. | 20.05 V/V |
| D. | 21.05V/V |
| Answer» C. 20.05 V/V | |
| 4. |
You are given two amplifiers, A and B, to connect in cascade between a 10-mV, 100-kΩ source (S) and a 100-Ω load (L). The amplifiers have voltage gain, input resistance, and output resistance as follows: for A, 100 V/V, 10 kΩ, 10 kΩ, respectively; for B, 1 V/V, 100 kΩ, 100 Ω, respectively. Your problem is to decide how the amplifiers should be connected so that the voltage gain is maximum. |
| A. | SABL |
| B. | SBAL |
| C. | Both have the same voltage gain |
| D. | None as neither combination is able to amplify the input signal |
| Answer» B. SBAL | |
| 5. |
The output voltage of a voltage amplifier has been found to decrease by 20% when a load resistance of 1 kΩ is connected. What is the value of the amplifier output resistance? |
| A. | 50Ω |
| B. | 200Ω |
| C. | 250Ω |
| D. | 350Ω |
| Answer» D. 350Ω | |
| 6. |
An amplifier has a voltage gain of 40db. The value of AVO is |
| A. | 10 |
| B. | 100 |
| C. | 20 |
| D. | 200 |
| Answer» C. 20 | |
| 7. |
THE_RATIO_OF_THE_SHORT_CIRCUIT_CURRENT_GAIN_OF_A_CURRENT_AMPLIFIER_(AI)_TO_THE_OPEN_CIRCUIT_VOLTAGE_GAIN_OF_A_VOLTAGE_AMPLIFIER_(AV),_GIVEN_THAT_BOTH_AMPLIFIERS_HAVE_THE_SAME_VALUE_OF_THE_INPUT_RESISTANCE_(RI)_AND_OUTPUT_RESISTANCE_(R0),_IS?$ |
| A. | R<sub>i</sub> |
| B. | R<sub>o</sub> |
| C. | R<sub>i</sub> / R<sub>0</sub> |
| D. | R<sub>o</sub> / R<sub>i</sub> |
| Answer» D. R<sub>o</sub> / R<sub>i</sub> | |
| 8. |
The_ratio_of_the_open_circuit_voltage_of_a_voltage_amplifier_(AV)_to_the_short_circuit_transconductance_of_a_(Gm)_of_a_transconductance_amplifier,_given_that_both_have_the_same_value_of_the_internal_resistance_(Ri)_and_the_output_resistance_(R0),_is$ |
| A. | R<sub>i</sub> |
| B. | R<sub>0</sub> |
| C. | 1/R<sub>i</sub> |
| D. | 1/R<sub>0</sub> |
| Answer» C. 1/R<sub>i</sub> | |
| 9. |
A transconductance amplifier with Ri = 2 kΩ, Gm = 40 mA/V, and Ro = 20 kΩ is fed with a voltage source having a source resistance of 2 kΩ and is loaded with a 1-kΩ resistance. Find the voltage gain realized?# |
| A. | 18.05 V/V |
| B. | 19.05 V/V |
| C. | 20.05 V/V |
| D. | 21.05V/V |
| Answer» C. 20.05 V/V | |
| 10. |
You are given two amplifiers, A and B, to connect in cascade between a 10-mV, 100-kΩ source (S) and a 100-Ω load (L). The amplifiers have voltage gain, input resistance, and output resistance as follows: for A, 100 V/V, 10 kΩ, 10 kΩ, respectively; for B, 1 V/V, 100 kΩ, 100 Ω, respectively. Your problem is to decide how the amplifiers should be connected so that the voltage gain is maximum.$ |
| A. | SABL |
| B. | SBAL |
| C. | Both have the same voltage gain |
| D. | None as neither combination is able to amplify the input signal |
| Answer» B. SBAL | |
| 11. |
The signal to be amplified is current signal and the output desired is a voltage signal. Which of the following amplifier can perform this task? |
| A. | Voltage amplifier |
| B. | Current amplifier |
| C. | Transconductance amplifier |
| D. | Transresistance amplifier |
| Answer» E. | |
| 12. |
The output voltage of a voltage amplifier has been found to decrease by 20% when a load resistance of 1 kΩ is connected. What is the value of the amplifier output resistance?$ |
| A. | 50Ω |
| B. | 200Ω |
| C. | 250Ω |
| D. | 350Ω |
| Answer» D. 350‚âà√≠¬¨¬© | |
| 13. |
An amplifier has a voltage gain of 40db. The value of AVO is |
| A. | 10 |
| B. | 100 |
| C. | 20 |
| D. | 200 |
| Answer» C. 20 | |
| 14. |
The ideal values for the input resistance (Ri) and the output resistance (Ro) of a transconductance amplifier are |
| A. | R<sub>i</sub> = 0 and R<sub>o</sub> = 0 |
| B. | R<sub>i</sub> = ‚àû and R<sub>0</sub> = ‚àû |
| C. | R<sub>i</sub> = 0 and R<sub>0</sub> = ‚àû |
| D. | R<sub>i</sub> = ‚àû and R<sub>i</sub> = 0 |
| Answer» C. R<sub>i</sub> = 0 and R<sub>0</sub> = ‚Äö√Ñ√∂‚àö‚Ć‚àö¬™ | |
| 15. |
Buffer amplifier needs to have |
| A. | Low input resistance and low output resistance |
| B. | High Input resistance and high output resistance |
| C. | Low input resistance and high output resistance |
| D. | High input resistance and low output resistance |
| Answer» E. | |