Electronic Devices-Voltage Regulators

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