Regulated DC Power Supply MCQ

Test your knowledge with important Regulated DC Power Supply MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Regulated DC Power Supply MCQs at Bissoy

• In an unregulated power supply, if input a.c. voltage increases, the output voltage .
  ক

  Increases

  খ

  Decreases

  গ

  Remains the same

  ঘ

  None of the above
• A certain regulator has a no-load voltage of 6 V and a full-load output of 5.82 V. What is the load regulation?
  ক

  3.09

  খ

  2.87

  গ

  5.72

  ঘ

  None of the above
• A power supply can deliver a maximum rated current of 0.5 A at full-load output voltage of 20 V. What is the minimum load resistance that you can connect across the supply?
  ক

  10 Ω

  খ

  20 Ω

  গ

  15 Ω

  ঘ

  40 Ω
• In a loaded Zener regulator, which is the largest Zener current?
  ক

  Series current

  খ

  Zener current

  গ

  Load current

  ঘ

  None of the above
• A Zener diode utilises ___________ characteristic for voltage regulation
  ক

  Forward

  খ

  Reverse

  গ

  Both forward and reverse

  ঘ

  None of the above
• In a 15 V Zener diode , the breakdown mechanism will occur by ___________
  ক

  Avalanche mechanism

  খ

  Zener mechanism

  গ

  Both Zener and avalanche mechanism

  ঘ

  None of the above
• Which of these is the best description for a Zener diode?
  ক

  It is a diode

  খ

  It is a constant current device

  গ

  It is a constant-voltage device

  ঘ

  It works in the forward region
• The Zener current will be minimum when ___________
  ক

  Load current is maximum

  খ

  Load current is minimum

  গ

  Load current is zero

  ঘ

  None of the above
• The current in a Zener diode is limited by ___________
  ক

  External resistance

  খ

  Power dissipation

  গ

  Both (A) and (B)

  ঘ

  None of the above
• Another name for Zener diode is ___________ diode
  ক

  Breakdown

  খ

  Voltage

  গ

  Power

  ঘ

  Current
• If the doping level is increased, the breakdown voltage of the Zener ___________
  ক

  Remains the same

  খ

  Is increased

  গ

  Is decreased

  ঘ

  None of the above
• Commercial power supplies have voltage regulation ___________
  ক

  of 10%

  খ

  of 15%

  গ

  of 25%

  ঘ

  within 1%
• A power supply which has voltage regulation of ___________ is unregulated power supply
  ক

  0%

  খ

  5%

  গ

  10%

  ঘ

  8%
• A Zener diode is used as a ___________ voltage regulating device
  ক

  Shunt

  খ

  Series

  গ

  Series-shunt

  ঘ

  None of the above
• What is true about the breakdown voltage in a Zener diode?
  ক

  It decreases when load current increases

  খ

  It destroys the diode

  গ

  It equals current times the resistance

  ঘ

  It is approximately constant
• The rupture of covalent bonds will occur when the electric field is ___________.
  ক

  100 V/cm

  খ

  0.6 V/cm

  গ

  1000 V/cm

  ঘ

  More than 10⁵ V/cm
• A Zener diode ___________
  ক

  Is a battery

  খ

  Acts like a battery in the breakdown region

  গ

  Has a barrier potential of 1 V

  ঘ

  Is forward biased
• When load current is zero, the Zener current will be
  ক

  Zero

  খ

  Minimum

  গ

  Maximum

  ঘ

  None of the above
• For increasing the voltage rating, zeners are connected in ___________
  ক

  Parallel

  খ

  Series-parallel

  গ

  Series

  ঘ

  None of the above
• As the junction temperature increases, the voltage breakdown point for avalanche mechanism ___________
  ক

  Remains the same

  খ

  Decrease

  গ

  Increases

  ঘ

  None of the above
• As the junction temperature increases, the voltage breakdown point for Zener mechanism ___________
  ক

  Is increased

  খ

  Is decreased

  গ

  Remains the same

  ঘ

  None of the above
• In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance?
  ক

  10 Ω

  খ

  50 Ω

  গ

  25 Ω

  ঘ

  40 Ω
• A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage?
  ক

  8 V

  খ

  7 V

  গ

  6 V

  ঘ

  2 V
• The load voltage is approximately constant when a Zener diode is ___________
  ক

  Forward biased

  খ

  Unbiased

  গ

  Reverse biased

  ঘ

  Operating in the breakdown region
• If the input a.c. voltage to regulated or ordinary power supply increases by 5% what will be the approximate change in d.c. output voltage?
  ক

  10%

  খ

  20%

  গ

  15%

  ঘ

  5%
• An ideal regulated power supply is one which has voltage regulation of ___________
  ক

  0%

  খ

  5%

  গ

  10%

  ঘ

  1%
• Two similar 15 V Zeners are connected in series. What is the regulated output voltage?
  ক

  15 V

  খ

  5 V

  গ

  30 V

  ঘ

  45 V
• In a Zener voltage regulator, the changes in load current produce changes in ___________
  ক

  Zener current

  খ

  Zener voltage

  গ

  Zener voltage as well as Zener current

  ঘ

  None of the above
• A Zener diode that has very narrow depletion layer will breakdown by mechanism
  ক

  Avalanche

  খ

  Zener

  গ

  Both avalanche and Zener

  ঘ

  None of the above
• A Zener voltage regulator is used for ___________ load currents
  ক

  High

  খ

  Very high

  গ

  Moderate

  ঘ

  Small