MCQOPTIONS
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MCQOPTIONS
This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices and Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
At series resonance, the impedance of a crystal is________ |
| A. | minimum |
| B. | maximum |
| C. | equal |
| D. | Zero |
| Answer» B. maximum | |
| 2. |
The lead-lag circuit in the Wien-bridge oscillator has a resonant frequency at which the attenuation is_________ |
| A. | 1/2 |
| B. | 1/4 |
| C. | 1/5 |
| D. | 1/3 |
| Answer» E. | |
| 3. |
In order to start up, a feedback oscillator requires______ |
| A. | unity feedback equal to 1 |
| B. | negative feedback less than 1 |
| C. | positive feedback greater than 1 |
| D. | no feedback |
| Answer» D. no feedback | |
| 4. |
A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called___________ |
| A. | a crystal oscillator |
| B. | a voltage-controlled oscillator |
| C. | an astable multivibrator |
| D. | a Hartley oscillator |
| Answer» C. an astable multivibrator | |
| 5. |
For a phase-shift oscillator, the gain of the amplifier stage must be greater than ________ |
| A. | 19 |
| B. | 30 |
| C. | 29 |
| D. | 1 |
| Answer» D. 1 | |