Voltage Regulators Questions and Answers

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Showing 10 of 49 questions
Q11
What is the ratio of the period of the output voltage to the period of the input voltage in a full-wave rectifier?
  • A 0
  • B 0.5
  • C 1
  • D 2
Answer: Option B
Q12
If the value of full-load voltage is the same as the no-load voltage, the voltage regulation calculated is ________ %, which is the best expected.
  • A 0
  • B 1
  • C 99
  • D 100
Answer: Option A
Q13
Calculate the ripple of a filter output having a 20-V dc component and a 1.7 Vr(rms) ac component.
  • A 6%
  • B 8.5%
  • C 85%
  • D 58%
Answer: Option B
Q14
A switching regulator that is configured as a voltage-inverter produces what type of output?
  • A an ac output with opposite phase to the input ac
  • B a dc output that is the negative of the dc input voltage
  • C an output that is a higher voltage than the input voltage
  • D an ac output from a dc input voltage
Answer: Option B
Q15
In Figure 17-1(a)(see question 6), the purpose of R1 is to
  • A provide a reference voltage.
  • B limit current through the diode.
  • C limit voltage to the op-amp.
  • D provide output voltage sampling.
Answer: Option B
Q16
For a full-wave rectifier with ac ripple at 120 Hz, the impedance of a capacitor can be calculated using XC = ________.
  • A 0.707 ÷ C
  • B 1.414 ÷ C
  • C 1.3 ÷ C
  • D 0.785 ÷ C
Answer: Option C
Q17
What is the purpose of an additional RC filter section in a power supply circuit?
  • A Increase the dc voltage component
  • B Increase the ac voltage component
  • C Decrease the ac voltage component
  • D None of the above
Answer: Option C
Q18
In which period is the capacitor filter charged 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 C
Q19
The ________ regulator is less efficient than the ________ type, but offers inherent short-circuit protection.
  • A series, shunt
  • B shunt, series
Answer: Option B
Q20
In which of the following applications is a pulsating dc voltage suitable?
  • A Battery charger
  • B Radio
  • C Stereo system
  • D Computer
Answer: Option A

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