MCQOPTIONS
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MCQOPTIONS
This section includes 7 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. |
A transistor in a series voltage regulator acts like a variable resistor. The value of its resistance is determined by _______ |
| A. | emitter current |
| B. | base current |
| C. | collector current |
| D. | it is not controlled by the transistor terminals |
| Answer» C. collector current | |
| 2. |
When is a regulator used? |
| A. | when there are small variations in load current and input voltage |
| B. | when there are large variations in load current and input voltage |
| C. | when there are no variations in load current and input voltage |
| D. | when there are small variations in load current and large variations in input voltage |
| Answer» B. when there are large variations in load current and input voltage | |
| 3. |
A transistor series regulator has the following specifications: VIN=15V, VZ=8.3V, =100, R=1.8K , RL=2K . What will be the Zener current in the regulator circuit? |
| A. | 4.56mA |
| B. | 3.26mA |
| C. | 4.56mA |
| D. | 3.68mA |
| Answer» E. | |
| 4. |
A Zener regulator has to handle supply voltage variation from 19.5V to 22.5V. Find the magnitude of regulating resistance, if the load resistance is 6K . The Zener diode has the following specifications: breakdown voltage =18V, (IZ)Min=2 A, maximum power dissipation=60mW and Zener resistance =20 . |
| A. | 0 < R < 500 |
| B. | 77.8 < R < 500 |
| C. | 77.8 < R < 100 |
| D. | 18 < R < 500 |
| Answer» C. 77.8 < R < 100 | |
| 5. |
Determine the minimum value of load resistance that can be used in the circuit with (IZ)Min=3mA. The input voltage is 10V and the resistance R is 500 . The Zener diode has a VZ=6V 0and (IZ)MAX=90mA. |
| A. | 1K |
| B. | 2.4K |
| C. | 1.2K |
| D. | 3.6K |
| Answer» D. 3.6K | |
| 6. |
Determine the maximum and minimum values of load current for which the Zener diode shunt regulator will maintain regulation when VIN=24V and R=500 . The Zener diode has a VZ=12V and (IZ)MAX=90mA. |
| A. | 40mA, 0mA respectively |
| B. | 36mA, 5mA respectively |
| C. | 10mA, 6mA respectively |
| D. | 21mA, 0mA respectively |
| Answer» E. | |
| 7. |
The percentage voltage regulation (VL) is given by_________ |
| A. | (V<sub>NL</sub>-V<sub>L</sub>)/V<sub>NL</sub>*100 |
| B. | (V<sub>NL</sub>+V<sub>L</sub>)/V<sub>NL</sub>*100 |
| C. | (V<sub>NL</sub>-V<sub>L</sub>)/V<sub>L</sub>*100 |
| D. | (V<sub>NL</sub>+V<sub>L</sub>)/V<sub>L</sub>*100 |
| Answer» B. (V<sub>NL</sub>+V<sub>L</sub>)/V<sub>NL</sub>*100 | |