HomeElectronics Multiple choice question MCQ online testmcq on voltage regulator and power supply mcq on voltage regulator and power supply Leave a Comment / Electronics Multiple choice question MCQ online test Spread the love 0% 0 votes, 0 avg Created on September 14, 2022DC Power supply Regulated DC power supply MCQ 1 / 56 1. Which transformer increases the voltage? a. Step down b. Step up c. None of the above d. Both a and b 2 / 56 2. In an unregulated power supply, if input a.c. voltage increases, the output voltage ……. a. Decreases b. Remains the same c. Increases d. None of the above 3 / 56 3. filter is used to obtain DC voltage with some ripple a. LC filter b. Capacitor filter c. RC filter d. None of the above 4 / 56 4. The output obtained by the rectifier is a. Pulsating AC b. None c. Pulsating DC d. Non-pulsating AC 5 / 56 5. The AC component present in output voltage is called a. None b. Ripple c. Switching regulator d. Non-linear regulators 6 / 56 6. The unregulated power supply used in a. All of the above b. Actuators c. Relays d. Solenoids 7 / 56 7. A power supply which has voltage regulation of ……….. is unregulated power supply a. 10 % b. 5 % c. 8% d. 0 % 8 / 56 8. A Zener regulator …………… in the power supply a. Neither increases nor decreases the ripple b. Decreases the ripple c. Data insufficient d. Increases the ripple 9 / 56 9. The output of the rectification is ................ a. Bidirectional b. None of the above c. Unidirectional d. Multidirectional 10 / 56 10. A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage? a. 7 V b. 2 V c. 6V d. 8 V 11 / 56 11. Output of a phase splitter is a. a pair of sine waves of equal amplitudes and opposite phase b. a pair of sine waves of unequal amplitude c. a pair of sine waves of unequal amplitudes and opposite phase d. a pair of sine waves of equal amplitudes 12 / 56 12. are the building blocks of regulated DC power supply a. All of the above b. Rectifier, DC filter c. Step down transformer d. Regulator 13 / 56 13. How many types of regulated power supplies are there? a. Three b. Two c. Four d. One Hint Adjustable voltage regulator Zener diode regulators Current limiters Series regulators 14 / 56 14. Which transformer is used in a regulated DC power supply? a. Both a or b b. None of the above c. Step down d. Step up 15 / 56 15. The rectification is a process of converting............. a. Alternating current or voltage into direct quantity b. Alternating current or voltage into direct quantity c. Alternating current into direct quantity d. Alternating voltage into direct quantity 16 / 56 16. Zener diode can be used as ………… a. dc voltage regulator only b. ac voltage regulator only c. none of the above d. both d.c. and a.c. voltage regulator 17 / 56 17. In switch-mode power supply the regulation of voltage is done by controlling a. Duty cycle b. Both a and b c. None of the above d. Voltage range 18 / 56 18. The ripple factor of the center tapped full-wave rectifier is a. 110% b. 100% c. 10% d. 48% 19 / 56 19. The efficiency of linear power supply is around a. 15-20% b. 30-40% c. 10-20% d. 20-30% 20 / 56 20. The transient response of linear power supply is around a. 120µs b. 100µs c. 20µs d. 10µs 21 / 56 21. The switch-mode power supply categorized into a. Four b. One c. Six d. Three Hint AC in DC out DC in DC out DC in AC out AC in AC out 22 / 56 22. A regulated DC power supply is also known as a. hyper power supply b. linear power supply c. dual power supply d. None of the above 23 / 56 23. If the load current drawn by unregulated power supply increases, the d.c. output voltage ……….. a. Stays the same b. Increases c. Decreases d. None of the above 24 / 56 24. How many diodes does the center tapped full wave rectifier consists of? a. Two b. Six c. Five d. One 25 / 56 25. The diode is a _______ device a. Non-linear b. Linear c. Static d. Dynamic 26 / 56 26. The rectifiers are categorized into a. Three b. One c. Two d. Four Half wave and Full wave rectifier 27 / 56 27. The input voltage range of linear power supply is around a. ±10% b. ±30% c. ±40% d. ±50% 28 / 56 28. When load current is zero, the Zener current will be ……… a. Zero b. Minimum c. Maximum d. None of the above 29 / 56 29. The maximum rectification efficiency of the center tapped full-wave rectifier is a. 40% b. 81.2% c. 30% d. 10% 30 / 56 30. Commercial power supplies have voltage regulation …………. a. of 25% b. within 1% c. of 10% d. of 15% 31 / 56 31. The maximum rectification efficiency of bridge full-wave rectifier is around a. 10% b. 81.2% c. 40% d. 30% 32 / 56 32. The input linear filter is required in a. Linear power supply b. SMPS c. None of the above d. Both a and b 33 / 56 33. The Zener current is maximum when the load current is a. infinity b. None of the above c. zero d. one 34 / 56 34. The hold-up time of linear power supply is around a. 1ms-2ms b. 10ms-20ms c. None of the above d. 20ms-30ms 35 / 56 35. The disadvantages of linear DC power supply are a. Efficiency is low b. Large size c. Costly d. All of the above 36 / 56 36. Which filter reduces the ripple? a. RC filter b. Capacitor filter c. None of the above d. LC filter 37 / 56 37. The noise of the switching DC power supply is a. 50mv-200mv b. 60mv-200mv c. 100mv-200mv d. 70mv-200mv 38 / 56 38. How many diodes does half-wave rectifier consists of a. Six b. Five c. One d. Three 39 / 56 39. An ideal regulated power supply is one which has voltage regulation of ………… a. 5% b. 1% c. 0% d. 10% 40 / 56 40. allows DC but it blocks AC a. None b. Inductor c. Insulator d. Conductor 41 / 56 41. In a Zener voltage regulator, the changes in load current produce changes in ……………. a. None of the above b. Zener voltage c. Zener voltage as well as Zener current d. Zener current 42 / 56 42. If the load current drawn by unregulated power supply increases, the d.c. output voltage ……… a. Stays the same b. None of the above c. Decreases d. Increases 43 / 56 43. Regulated power supplies are used in .................. a. Mobile chargers b. All of the above c. Measurement devices d. Computers 44 / 56 44. ..............rectifiers are full-wave rectifiers a. Bridge b. None of the above c. Both a and b d. Center-tapped 45 / 56 45. The Zener current will be minimum when ………… a. Load current is maximum b. None of the above c. Load current is minimum d. Load current is zero 46 / 56 46. The ripple factor of half-wave rectifier is a. 121% b. 100% c. 110% d. 10% 47 / 56 47. For increasing the voltage rating, zeners are connected in ………….. a. Parallel b. Series-parallel c. None of the above d. Series 48 / 56 48. The maximum rectification efficiency of half-wave rectifier is around a. 20% b. 40% c. 30% d. 10% 49 / 56 49. Two similar 15 V Zeners are connected in series. What is the regulated output voltage? a. 5 V b. 45 V c. 30 V d. 15 V 50 / 56 50. The advantages of linear DC power supply are a. All of the above b. Output noise is low c. Output transient response is fast d. Common mode noise current is low 51 / 56 51. If the load resistance decreases in a Zener regulator, then Zener current ……………. a. Decreases b. None of the above c. Stays the same d. Increases 52 / 56 52. The load regulation of the switching DC power supply is a. 0.10-0.1% b. 0.15-0.1% c. 0.1-1.0% d. 0.05-0.1% 53 / 56 53. How many diodes does bridge full-wave rectifier consists a. Four b. One c. Two d. Three 54 / 56 54. The output voltage of a switch-mode power supply is a. Less b. very less c. More d. More or less 55 / 56 55. In an unregulated power supply, if load current increases, the output voltage ……….. a. Remains the same b. Decreases c. Increases d. None of the above 56 / 56 56. Rectification can be done by using a. Bridge rectifiers b. Transformers c. Conductors d. 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