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 zener diode is heavily doped because______ |
| A. | to have low breakdown voltage |
| B. | to have high breakdown voltage |
| C. | to have high current variations |
| D. | to maintain perfect quiescent point |
| Answer» B. to have high breakdown voltage | |
| 2. |
Avalanche breakdown in zener diode is ______ |
| A. | electric current multiplication takes place |
| B. | phenomenon of voltage multiplication takes place |
| C. | electrons are decelerated for a period of time |
| D. | sudden rise in voltage takes place. |
| Answer» B. phenomenon of voltage multiplication takes place | |
| 3. |
The 6V Zener diode shown has zener resistance and a knee current of 5mA. The minimum value of R so that the voltage does not drop below 6V is? |
| A. | 1.2Ω |
| B. | 80 Ω |
| C. | 50 Ω |
| D. | 70 Ω |
| Answer» C. 50 Ω | |
| 4. |
The zener diode in the circuit has a zener voltage of 5.8V and knee current of 0.5mA. The maximum load current drawn with proper function over input voltage range between 20 and 30V is? |
| A. | 23.7mA |
| B. | 20mA |
| C. | 26mA |
| D. | 48.3mA |
| Answer» B. 20mA | |
| 5. |
In the circuit below, the knee current of ideal zener diode is 10mA. To maintain 5V across the RL, the minimum value of RL is? |
| A. | 120 |
| B. | 125 |
| C. | 250 |
| D. | 100 |
| Answer» C. 250 | |
| 6. |
For the zener diode shown in the figure, the zener voltage at knee is 7V, the knee current is negligible and the zener dynamic resistance is 10Ω. If the input voltage (Vi) ranges from 10 to 16 volts, the output voltage (Vo) ranges from? |
| A. | 7 to 7.29V |
| B. | 6 to 7V |
| C. | 7.14 to 7.43V |
| D. | 7.2 to 8V |
| Answer» D. 7.2 to 8V | |
| 7. |
Which of the following are true about a zener diode?1) it allows current flow in reverse direction also2) it’s used as a shunt regulator3) it operates in forward bias condition |
| A. | 3 only |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 2 only |
| Answer» C. 2 and 3 | |
| 8. |
AVALANCHE_BREAKDOWN_IN_ZENER_DIODE_IS_______?$ |
| A. | electric current multiplication takes place |
| B. | phenomenon of voltage multiplication takes place |
| C. | electrons are decelerated for a period of time |
| D. | sudden rise in voltage takes place. |
| Answer» B. phenomenon of voltage multiplication takes place | |
| 9. |
The_zener_diode_is_heavily_doped_because______$ |
| A. | to have low breakdown voltage |
| B. | to have high breakdown voltage |
| C. | to have high current variations |
| D. | to maintain perfect quiescent point |
| Answer» B. to have high breakdown voltage | |
| 10. |
When the voltage across the zener diode increases_________ |
| A. | temperature remains constant and crystal ions vibrate with large amplitudes |
| B. | temperature increases and crystal ions vibrate with large amplitudes |
| C. | temperature remains constant and crystal ions vibrate with smaller amplitudes |
| D. | temperature decreases and crystal ions vibrate with large amplitudes |
| Answer» C. temperature remains constant and crystal ions vibrate with smaller amplitudes | |
| 11. |
Which of the following are true about a zener diode? |
| A. | it allows current flow in reverse direction also |
| B. | it’s used as a shunt regulator |
| C. | it operates in forward bias condition |
| D. | 3 only |
| Answer» C. it operates in forward bias condition | |
| 12. |
A zener diode works on the principle of_________ |
| A. | tunneling of charge carriers across the junction |
| B. | thermionic emission |
| C. | diffusion of charge carriers across the junction |
| D. | hopping of charge carriers across the junction |
| Answer» B. thermionic emission | |