Voltage Regulators Questions and Answers

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Showing 10 of 49 questions
Q1
The 7812 regulator IC provides ________.
  • A 5 V
  • B –5 V
  • C 12 V
  • D –12 V
Answer: Option C
Q2
Voltage regulators keep a constant ________ output voltage when the input or load varies within limits.
  • A dc
  • B ac
  • C ripple
  • D [NIL]
Answer: Option A
Q3
Calculate the ripple voltage of a full-wave rectifier with a 75-F filter capacitor connected to a load drawing 40 mA.
  • A 1.20 V
  • B 1.28 V
  • C 1.32 V
  • D 1.41 V
Answer: Option B
Q4
In which period is the capacitor filter discharged through the load in a full-wave rectifier?
  • A The time during the positive cycle
  • B The time during which the diodes are not conducting
  • C The time during which the diode(s) is (are) conducting
  • D The time during the negative cycle
Answer: Option B
Q5
The 7805 regulator IC provides ________.
  • A 5 V
  • B –5 V
  • C 12 V
  • D –12 V
Answer: Option A
Q6
What is the range of the voltage level of the LM317 adjusted voltage regulator?
  • A 0 V to 5 V
  • B 1.2 V to 37 V
  • C –5 V to –24 V
  • D 5 V to 24 V
Answer: Option B
Q7
Calculate the voltage regulation of a power supply having VNL = 50 V and VFL = 48 V.
  • A 4.17%
  • B 5.2%
  • C 6.2%
  • D 7.1%
Answer: Option A
Q8
Switching regulator efficiencies can be greater than ________ percent.
  • A 60
  • B 70
  • C 80
  • D 90
Answer: Option D
Q9
The 7912 regulator IC provides ________ .
  • A 5 V
  • B –5 V
  • C 12 V
  • D –12 V
Answer: Option D
Q10
What is the typical dropout voltage for the 7812 fixed positive voltage regulator?
  • A 4 mV
  • B 100 mV
  • C 1.5 V
  • D 2 V
Answer: Option D

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