MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Microwave Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For Colpitts oscillator, the capacitors C1 and C2 in the feedback network are 1 µF and 25 µF respectively. Then the β value of the transistor is: |
| A. | 35 |
| B. | 000.76 |
| C. | 25 |
| D. | 0.0025 |
| Answer» D. 0.0025 | |
| 2. |
An inductor is operating at frequency of 50 MHz. Its inductance is 0.1 µH, and then the series resistance associated with the inductor is: (Qo=100) |
| A. | 0.31 Ω |
| B. | 1.32 Ω |
| C. | 1 Ω |
| D. | 1.561 Ω |
| Answer» B. 1.32 Ω | |
| 3. |
The necessary condition for oscillation in a Hartley oscillator is: |
| A. | L1/L2 = gm/Gi |
| B. | L1/L2 =Gi /gm |
| C. | L2L/L1 = gm/Gi |
| D. | None of the mentioned |
| Answer» B. L1/L2 =Gi /gm | |
| 4. |
Colpitts oscillator operating at 50 MHz has an inductor in the feedback section of value 0.10µH. then the values of the capacitors in the feedback section is: |
| A. | 100 pF, 100 pF |
| B. | 100 pF, 50 pF |
| C. | 70 pF, 130 pF |
| D. | 80 pF, 60 pF |
| Answer» B. 100 pF, 50 pF | |
| 5. |
COLPITTS_OSCILLATOR_IN_THE_FEEDBACK_SECTION_HAS_AN_INDUCTANCE_OF_4_MH_AND_CAPACITORS_OF_12_NH_AND_4_NH._THEN_THE_RESONANT_FREQUENCY_OF_COLPITTS_OSCILLATOR_IS:?$ |
| A. | 50.4 kHz |
| B. | 35.1 kHz |
| C. | 45.9 kHz |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 6. |
For Colpitts oscillator, the capacitors C1 and C2 in the feedback network are 1 µF and 25 µF respectively. Then the β value of the transistor is:$# |
| A. | 35 |
| B. | 000.76 |
| C. | 25 |
| D. | 0.0025 |
| Answer» D. 0.0025 | |
| 7. |
Hartley oscillator has inductance values of 12 mH and 4 mH in the feedback section and a capacitor of 4 nF. Then the resonant frequency of the circuit is? |
| A. | 19.89 kHz |
| B. | 25 kHz |
| C. | 45 kHz |
| D. | 12 kHz |
| Answer» B. 25 kHz | |
| 8. |
An inductor is operating at frequency of 50 MHz. Its inductance is 0.1 µH, and then the series resistance associated with the inductor is: (Qo=100)$ |
| A. | 0.31 Ω |
| B. | 1.32 Ω |
| C. | 1 Ω |
| D. | 1.561 Ω |
| Answer» B. 1.32 ‚âà√≠¬¨¬© | |
| 9. |
Colpitts oscillator operating at 50 MHz has an inductor in the feedback section of value 0.10µH. then the values of the capacitors in the feedback section is:$ |
| A. | 100 pF, 100 pF |
| B. | 100 pF, 50 pF |
| C. | 70 pF, 130 pF |
| D. | 80 pF, 60 pF |
| Answer» B. 100 pF, 50 pF | |
| 10. |
The necessary condition for oscillation in a Colpitts oscillator is: |
| A. | C<sub>2</sub>/C<sub>1</sub>=g<sub>m</sub>/G<sub>i</sub> |
| B. | C<sub>1</sub>/C<sub>2</sub>=g<sub>m</sub>/G<sub>i</sub> |
| C. | C<sub>2</sub>/C<sub>1</sub>= g<sub>m</sub>*G<sub>i</sub> |
| D. | None of the mentioned |
| Answer» B. C<sub>1</sub>/C<sub>2</sub>=g<sub>m</sub>/G<sub>i</sub> | |
| 11. |
The criterion on which oscillations are produced in the oscillator circuit is called: |
| A. | Shannon’s criteria |
| B. | Barkhausen criteria |
| C. | Colpitts criteria |
| D. | None of the mentioned |
| Answer» C. Colpitts criteria | |
| 12. |
The transfer function of an RF oscillator is given by: |
| A. | A/ (1-AH (ω)) |
| B. | A/ (1+AH (ω)) |
| C. | A/ (-1+AH (ω)) |
| D. | 1/ (1-AH (ω)) |
| Answer» B. A/ (1+AH (‚âà√¨‚àö¬¢)) | |
| 13. |
_________ is a non linear circuit that converts DC power to an AC waveform of desired frequency based on the oscillator design. |
| A. | Attenuator |
| B. | Amplifier |
| C. | Oscillator |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |