MCQOPTIONS
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MCQOPTIONS
This section includes 12 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 delay time can be reduced by? |
| A. | decreasing lifetime and increasing ratio of reverse to forward current |
| B. | increasing lifetime and decreasing ratio of reverse to forward current |
| C. | increasing lifetime and increasing ratio of reverse to forward current |
| D. | decreasing lifetime and decreasing ratio of reverse to forward current |
| Answer» B. increasing lifetime and decreasing ratio of reverse to forward current | |
| 2. |
The delay in switching between the ON and OFF states is due to _________ |
| A. | The time required to change amount of excess minority carriers stored in quasi-neutral regions |
| B. | The time required to change amount of excess majority carriers stored in quasi-neutral regions |
| C. | The conduction between storage time and recovery time |
| D. | The exponential increase in carriers in N region |
| Answer» B. The time required to change amount of excess majority carriers stored in quasi-neutral regions | |
| 3. |
A PN junction diode with 100Ω resistor is forward biased such that 100A current flows. If voltage across this combination is instantaneously reversed to 10V at t=0, the reverse current that flows through diode at t=0 is? |
| A. | 10mA |
| B. | 100mA |
| C. | -100mA |
| D. | -10mA |
| Answer» C. -100mA | |
| 4. |
The switch is at position shown in the figure initially and steady state is from t=0 to t=to. The switch suddenly is thrown to the other position. The current flowing through the 10K resistor from t=0 is? |
| A. | 1mA |
| B. | 2mA |
| C. | -2mA |
| D. | -1mA |
| Answer» D. -1mA | |
| 5. |
In a circuit below, the switch is at position 1 at t<0 and at position 2 when t=0. Assume diode has zero voltage drop and storage time. For 0 |
| A. | 5V |
| B. | -5V |
| C. | 0v |
| D. | 10V |
| Answer» C. 0v | |
| 6. |
Which of the following are true?1) In reverse bias, the diode undergoes stages of storage and transition times2) Minority charge carriers accumulation makes the diode as a short circuit3) Storage time is the sum of recovery and transition times |
| A. | 1 only |
| B. | 2 and 3 |
| C. | 3 only |
| D. | 1 and 2 only |
| Answer» E. | |
| 7. |
THE_DELAY_IN_SWITCHING_BETWEEN_THE_ON_AND_OFF_STATES_IS_DUE_TO__________?$ |
| A. | The time required to change amount of excess minority carriers stored in quasi-neutral regions |
| B. | The time required to change amount of excess majority carriers stored in quasi-neutral regions |
| C. | The conduction between storage time and recovery time |
| D. | The exponential increase in carriers in N region |
| Answer» B. The time required to change amount of excess majority carriers stored in quasi-neutral regions | |
| 8. |
The_delay_time_can_be_reduced_by?$ |
| A. | decreasing lifetime and increasing ratio of reverse to forward current |
| B. | increasing lifetime and decreasing ratio of reverse to forward current |
| C. | increasing lifetime and increasing ratio of reverse to forward current |
| D. | decreasing lifetime and decreasing ratio of reverse to forward current |
| Answer» B. increasing lifetime and decreasing ratio of reverse to forward current | |
| 9. |
Time taken for a diode to reach 90% of its final value when switched from steady state is______ |
| A. | 2.3*time constant |
| B. | 2.2*time constant |
| C. | 1.5*time constant |
| D. | equals the time constant |
| Answer» C. 1.5*time constant | |
| 10. |
Switching speed of P+ junction depends on. |
| A. | Mobility of minority carriers in P junction |
| B. | Life time of minority carriers in P junction |
| C. | Mobility of majority carriers in N junction |
| D. | Life time of minority carriers in N junction |
| Answer» E. | |
| 11. |
Reverse recovery time for a diode is? |
| A. | Time taken to eliminate excess minority charge carriers |
| B. | Sum of storage time (T<sub>S</sub>) and transition time (T<sub>T</sub>) |
| C. | Time taken to eliminate excess majority charge carriers |
| D. | Time elapsed to return to non conduction state |
| Answer» B. Sum of storage time (T<sub>S</sub>) and transition time (T<sub>T</sub>) | |
| 12. |
Diode acts as a short circuit when switched from forward to reverse bias for some time due to______ |
| A. | Accumulation of minority charge carriers when it’s in forward bias |
| B. | Accumulation of majority charge carriers when it’s in forward bias |
| C. | Accumulation of minority charge carriers when it’s in reverse bias |
| D. | Accumulation of majority charge carrier when it’s in reverse bias |
| Answer» B. Accumulation of majority charge carriers when it‚Äö√Ñ√∂‚àö√ë‚àö¬•s in forward bias | |