MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
Which of the following biasing techniques are prone to thermal runaway? |
| A. | self bias |
| B. | collector to base bias |
| C. | fixed bias |
| D. | the biasing technique is identified by temperature effect |
| Answer» D. the biasing technique is identified by temperature effect | |
| 2. |
When the power dissipation increases in a transistor, the thermal resistance_________ |
| A. | increases |
| B. | cannot be predicted |
| C. | decreases |
| D. | remains same |
| Answer» D. remains same | |
| 3. |
Discrete transistors T1 and T2 having maximum collector current rating of 0.75A are connected in parallel as shown in the figure. This combination is treated as a single transistor to carry a single current of 1A, when biased with a self bias circuit. When the circuit is switched ON, T1 had draws 0.55A and T2 draws 0.45A. If the supply is kept ON continuously, it is very likely that_________ |
| A. | both T1 and T2 get damaged |
| B. | both T1 and T2 will be safe |
| C. | only T1 gets damaged |
| D. | only T2 gets damaged |
| Answer» D. only T2 gets damaged | |
| 4. |
WHEN_THE_POWER_DISSIPATION_INCREASES_IN_A_TRANSISTOR,_THE_THERMAL_RESISTANCE_________?$ |
| A. | increases |
| B. | cannot be predicted |
| C. | decreases |
| D. | remains same |
| Answer» D. remains same | |
| 5. |
Which_of_the_following_biasing_techniques_are_prone_to_thermal_runaway?$ |
| A. | self bias |
| B. | collector to base bias |
| C. | fixed bias |
| D. | the biasing technique is identified by temperature effect |
| Answer» D. the biasing technique is identified by temperature effect | |
| 6. |
When the collector current is increased in a transistor_________ |
| A. | the reverse current is increased |
| B. | the temperature is increased |
| C. | collisions of electrons decrease |
| D. | the emitter does not emit electrons |
| Answer» C. collisions of electrons decrease | |
| 7. |
The thermal runway is avoided in a collector to base bias because_________ |
| A. | of its independence on β |
| B. | of the positive feedback produced by the base resistor |
| C. | of the negative feedback produced by the base resistor |
| D. | of its dependence on β |
| Answer» D. of its dependence on ‚âà√≠‚Äö√¢¬ß | |
| 8. |
When the temperature is increased, what happens to the collector current after a feedback is given? |
| A. | it remains same |
| B. | it increases |
| C. | it cannot be predicted |
| D. | it decreases |
| Answer» E. | |
| 9. |
The thermal runway is avoided in a self bias because_________ |
| A. | of its independence on β |
| B. | of the positive feedback produced by the emitter resistor |
| C. | of the negative feedback produced by the emitter resistor |
| D. | of its dependence on β |
| Answer» D. of its dependence on ‚âà√≠‚Äö√¢¬ß | |
| 10. |
Thermal runaway is_________ |
| A. | an uncontrolled positive feedback |
| B. | a controlled positive feedback |
| C. | an uncontrolled negative feedback |
| D. | a controlled negative feedback |
| Answer» B. a controlled positive feedback | |