MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Linear Integrated Circuit knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
WHAT_SHOULD_BE_THE_FREQUENCY_RANGE_OF_PULSE_GENERATOR??$ |
| A. | 250 kHz |
| B. | 40 kHz |
| C. | 120 kHz |
| D. | 20 kHz |
| Answer» E. | |
| 2. |
Which of the following is considered to be the most important components of the switching regulator?$ |
| A. | RC or RLC filter |
| B. | RL or RLC filter |
| C. | ORC or RL filter |
| D. | RC, RLC or RL filter |
| Answer» C. ORC or RL filter | |
| 3. |
Filter_used_in_switching_regulator’s_are_also_as_called$# |
| A. | DC – AC transformers |
| B. | AC – DC transformers |
| C. | DC transformer |
| D. | AC transformer |
| Answer» D. AC transformer | |
| 4. |
Calculate the efficiency of the step down switching regulator given the input voltage Vin= 13.5v and output voltage =6v. Assume the saturating Voltage Vs=1.1v and the forward voltage drop Vd = 1.257v |
| A. | η = 75% |
| B. | η = 48.5% |
| C. | η = 63.9% |
| D. | η = 80.5% |
| Answer» E. | |
| 5. |
Find the value of Rsc, L and Co for a µA7840 switching regulator to provide +5 v at 3A, using the following specifications: toff= 24µs, ripple voltage = 400mA and ton=26µs.$ |
| A. | R<sub>sc</sub> = 55 mΩ , L = 25µH & C<sub>o</sub> = 750µF |
| B. | R<sub>sc</sub> = 550 mΩ , L = 25µH & C<sub>o</sub> = 75µF |
| C. | R<sub>sc</sub> = 650 mΩ , L = 25µH & C<sub>o</sub> = 65µF |
| D. | R<sub>sc</sub> = 720 mΩ , L = 25µH & C<sub>o</sub> = 250µF |
| Answer» B. R<sub>sc</sub> = 550 m‚âà√≠¬¨¬© , L = 25¬¨¬®¬¨¬µH & C<sub>o</sub> = 75¬¨¬®¬¨¬µF | |
| 6. |
Which is the most commonly used low voltage switching regulators? |
| A. | Powdered Permalloy toroids |
| B. | Fermite EI, U and toroid cores |
| C. | Silicon steel EI butt stacks |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 7. |
Which among the following act as a switch in switching regulator? |
| A. | Rectifiers |
| B. | Diode |
| C. | Transistors |
| D. | Relays |
| Answer» D. Relays | |
| 8. |
The switching regulators can operate in |
| A. | Step up |
| B. | Step down |
| C. | Polarity inverting |
| D. | All the mentioned |
| Answer» E. | |
| 9. |
A series switching regulators |
| A. | Improves the efficiency of regulators |
| B. | Improves the flexibility of switching |
| C. | Enhance the response of regulators |
| D. | All of the mentioned |
| Answer» B. Improves the flexibility of switching | |
| 10. |
Linear series regulators are suited for application with |
| A. | High current |
| B. | Medium current |
| C. | Low current |
| D. | None of the mentioned |
| Answer» C. Low current | |
| 11. |
Fixed voltage regulators and adjustable regulators are often called as |
| A. | Series dissipative regulators |
| B. | Shunt dissipative regulators |
| C. | Stray dissipative regulators |
| D. | All the mentioned |
| Answer» B. Shunt dissipative regulators | |
| 12. |
What is done in switching regulators to minimize its power dissipation during switching? |
| A. | Uses external transistor |
| B. | Uses 1mH choke |
| C. | Uses external transistor and 1mH choke |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |