Electronic Devices-Voltage Regulators
Electronic Devices-Voltage Regulators
21. In a simple series regulator circuit, which of the following components is the controlling element?
- Load resistor
- Zener diode
- Transistor Q1
- None of the above
22. In an improved shunt regulator, which of the following components sets the reference voltage?
- Transistor Q1
- Zener diode
- Transistor Q2
- RS
23. ________ regulation can be defined as the percentage change in the output voltage for a given change in load current.
- Line
- Load
24. How many diodes conduct in the full-wave bridge rectifier while the capacitor is being charged?
- 1
- 2
- 3
- 4
26. What are the typical values of Vref and Iadj for the LM317 adjustable voltage regulator?
- 1.0 V, 100 mA
- 1.5 V, 100 mA
- 1.25 V, 100 µA
- 1.25 V, 10 mA
27. Which component(s) set(s) the voltage across the load in a basic transistor shunt regulator?
- Zener diode
- Transistor base-emitter voltage
- Both the Zener diode and the transistor base-emitter voltage
- None of the above
28. Voltage regulation requires
- only line regulation.
- only load regulation.
- a constant load.
- load and line regulation.
29. Across which of the following components of a power supply does the average (dc) voltage exist?
- Diodes
- Secondary of the transformer
- Capacitor filter
- None of the above
30. Switching regulators are more efficient than linear regulators and are particularly useful in ________-voltage, ________-current applications.
- high, high
- low, high
- high, low