Voltage Regulators Questions and Answers

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Showing 10 of 49 questions
Q21
In a simple series regulator circuit, which of the following components is the controlling element?
  • A Load resistor
  • B Zener diode
  • C Transistor Q1
  • D None of the above
Answer: Option C
Q22
In an improved shunt regulator, which of the following components sets the reference voltage?
  • A Transistor Q1
  • B Zener diode
  • C Transistor Q2
  • D RS
Answer: Option B
Q23
________ regulation can be defined as the percentage change in the output voltage for a given change in load current.
  • A Line
  • B Load
Answer: Option B
Q24
How many diodes conduct in the full-wave bridge rectifier while the capacitor is being charged?
  • A 1
  • B 2
  • C 3
  • D 4
Answer: Option B
Q25
How many terminals does a 7800 series IC regulator have?
  • A 2
  • B 3
  • C 4
  • D none of the above
Answer: Option B
Q26
What are the typical values of Vref and Iadj for the LM317 adjustable voltage regulator?
  • A 1.0 V, 100 mA
  • B 1.5 V, 100 mA
  • C 1.25 V, 100 µA
  • D 1.25 V, 10 mA
Answer: Option C
Q27
Which component(s) set(s) the voltage across the load in a basic transistor shunt regulator?
  • A Zener diode
  • B Transistor base-emitter voltage
  • C Both the Zener diode and the transistor base-emitter voltage
  • D None of the above
Answer: Option C
Q28
Voltage regulation requires
  • A only line regulation.
  • B only load regulation.
  • C a constant load.
  • D load and line regulation.
Answer: Option D
Q29
Across which of the following components of a power supply does the average (dc) voltage exist?
  • A Diodes
  • B Secondary of the transformer
  • C Capacitor filter
  • D None of the above
Answer: Option C
Q30
Switching regulators are more efficient than linear regulators and are particularly useful in ________-voltage, ________-current applications.
  • A high, high
  • B low, high
  • C high, low
Answer: Option B

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