SMPS (Switched Mode Power Supplies) MCQs January 8, 2026November 19, 2024 by u930973931_answers 20 min Score: 0 Attempted: 0/20 Subscribe 1. The primary advantage of a Switched Mode Power Supply (SMPS) over a Linear Power Supply is: (A) Higher weight (B) Lower cost (C) Higher efficiency (D) Simpler design 2. In a Switched Mode Power Supply, the conversion of AC to DC is achieved through: (A) Switching (B) Rectification (C) Filtering (D) Regulation 3. Which component in an SMPS is used to store energy during the switching cycle? (A) Resistor (B) Capacitor (C) Transformer (D) Inductor 4. The primary function of the switch (usually a transistor) in an SMPS is to: (A) Rapidly switch the input signal on and off (B) Convert the input AC to DC (C) Store energy for conversion (D) Regulate the output voltage 5. In an SMPS, the switching frequency typically ranges from: (A) 50 Hz to 60 Hz (B) 10 Hz to 100 Hz (C) 100 Hz to 1 kHz (D) 1 kHz to 1 MHz 6. Which of the following is a type of Switched Mode Power Supply? (A) Buck converter (B) Linear converter (C) Transformer-based rectifier (D) Thyristor-based regulator 7. A buck converter in an SMPS is used to: (A) Step down the input voltage (B) Step up the input voltage (C) Convert DC to AC (D) Convert AC to DC 8. Which type of SMPS is commonly used to step up a low DC voltage to a higher DC voltage? (A) Buck converter (B) Buck-boost converter (C) Boost converter (D) Flyback converter 9. A flyback converter is typically used in SMPS for: (A) High power conversion (B) Voltage regulation (C) Low power applications (D) Signal filtering 10. The term “buck-boost converter” refers to an SMPS that can: (A) Step up or step down the voltage (B) Regulate the output current (C) Filter unwanted noise (D) Only step up the voltage 11. In an SMPS, which component typically converts the DC voltage into a high-frequency AC signal? (A) Transformer (B) Rectifier (C) Switch (Transistor) (D) Inductor 12. The efficiency of an SMPS is primarily determined by: (A) The energy losses in the switch and other components (B) The type of filter used (C) The quality of the rectifier (D) The frequency of the switching 13. In an SMPS, the purpose of the rectifier stage is to: (A) Filter the output voltage (B) Convert the AC signal to DC (C) Step up or step down the voltage (D) Provide power to the switching device 14. Which of the following is typically used to filter the output voltage in an SMPS? (A) Transformer (B) Inductor (C) Diode (D) Capacitor 15. What is the effect of increasing the switching frequency in an SMPS? (A) Increased electromagnetic interference (EMI) (B) Increased efficiency (C) Lower output voltage (D) Increased power loss 16. Switched Mode Power Supplies (SMPS) are commonly used in: (A) Audio amplifiers (B) All of the above (C) Power distribution systems (D) Power adapters for laptops 17. Which of the following is a typical application of an SMPS in electronic devices? (A) Voltage regulation in microcontrollers (B) Low-power signal amplification (C) Power supply for motor drives (D) High-frequency signal modulation 18. SMPS are preferred in battery-powered devices because they: (A) Require fewer components (B) Provide a constant output voltage (C) Have higher efficiency, leading to longer battery life (D) Are cheaper than linear power supplies 19. An important feature of SMPS is that they can: (A) Handle both AC and DC inputs (B) Work only with DC input (C) Provide a regulated DC output from an unregulated AC input (D) Function only at high power levels 20. SMPS are often preferred in high-power applications because of their ability to: (A) Use large transformers for voltage conversion (B) Operate at high switching frequencies (C) Provide continuous, unregulated output (D) Require only passive components