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