MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
THE_EQUIVALENT_CIRCUIT_OF_A_QUARTZ_CRYSTAL_HAS_LCR_ARM_CAPACITANCE_OF_12NF_AND_INDUCTANCE_OF_3MH_AND_PARALLEL_ARM_CAPACITANCE_OF_4NF._PARALLEL_RESONANT_FREQUENCY_FOR_THE_CIRCUIT_IS:?$ |
| A. | 3 MHz |
| B. | 0.3 MHz |
| C. | 6 MHz |
| D. | 9 MHz |
| Answer» B. 0.3 MHz | |
| 2. |
Parallel resonant frequency of quartz crystal is given by? |
| A. | 1/ ‚àö(LC‚ÇíC/(C‚Çí+C)) |
| B. | 1/‚àöLC |
| C. | 1/‚àöLC‚Çí |
| D. | 1/ ‚àö(L(C‚Çí+C) ) |
| Answer» B. 1/‚Äö√Ñ√∂‚àö‚Ć‚àö‚àÇLC | |
| 3. |
In the equivalent circuit of a quartz crystal, LCR arm has an inductance of 4 mH and capacitor has a value of 4nF, then the series resonant frequency of the oscillator is? |
| A. | 0.25 MHz |
| B. | 2.5 MHz |
| C. | 25 MHz |
| D. | 5 MHz |
| Answer» B. 2.5 MHz | |
| 4. |
In the plot of reactance v/s frequency of a crystal oscillator, the reactance between series resonant frequency and parallel resonant frequency is: |
| A. | capacitive |
| B. | inductive |
| C. | both capacitive and inductive |
| D. | none of the mentioned |
| Answer» C. both capacitive and inductive | |
| 5. |
Quartz crystal is used in the _______region, where the operating point of the crystal is fixed. |
| A. | resistive |
| B. | inductive reactance |
| C. | capacitive reactance |
| D. | none of the mentioned |
| Answer» C. capacitive reactance | |
| 6. |
A quartz crystals equivalent circuit is a series LCR circuit and has a series resonant frequency. |
| A. | true |
| B. | false |
| Answer» C. | |
| 7. |
Quartz crystal and tourmaline used in oscillators work on the principle of: |
| A. | photo electric effect |
| B. | piezo electric effect |
| C. | Raman effect |
| D. | black body radiation |
| Answer» C. Raman effect | |
| 8. |
Quartz crystals are more efficient as a feedback network because: |
| A. | less circuit complexity |
| B. | cost effective |
| C. | crystals operate at high voltage levels |
| D. | LC circuits have unloaded Q of a few hundreds |
| Answer» E. | |
| 9. |
In an oscillator, the resonant feedback circuit must have must have a low Q in order to achieve stable oscillation. |
| A. | true |
| B. | false |
| Answer» C. | |
| 10. |
One condition to be satisfied in an oscillator circuit so that stable oscillations are produced is: |
| A. | positive feedback is to be achieved |
| B. | negative feedback is to be achieved |
| C. | 180<sup>0</sup> phase shift is required between the transistor input and output. |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |