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17
ASSIGNMENT 3
Textbook assignment: Chapter 3, “Power Supplies,” pages 3-1 through 3-60.
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3-1.
The electronic power supply was
developed to fulfill which of the
following needs?
1. Reliability
2. Convenience
3. Cost effectiveness
4. All of the above
3-2.
Which of the following is NOT one of
the four sections of a basic power
supply?
1. Transformer
2. Oscillator
3. Rectifier
4. Filter
3-3.
The primary purpose of the transformer
in an electronic power supply is to
isolate the power supply from ground.
1. True
2. False
3-4.
What is the primary function of the
rectifier section?
1. To convert dc to ac
2. To convert ac to pulsating dc
3. To increase average voltage output
4. To decrease average voltage output
3-5.
What is/are the function(s) of the filter
section?
1. To eliminate dc voltage
2. To increase the amplitude of the ac
3. To convert pulsating dc to steady
dc
4. All of the above
3-6.
The separate step-down windings in a
transformer provide which of the
following functions?
1. Filament voltage for power supply
tubes
2. Filament voltage for the electronic
load
3. Both 1 and 2 above
4. High voltage for the rectifier
3-7.
The purpose of a center tap in a
transformer is to provide
1. two separate filament voltages to the
rectifier
2. a step-down voltage to the rectifier
3. pulsating dc to the rectifier
4. two outputs from one transformer
3-8.
A diode vacuum tube is an ideal
rectifier for which, if any, of the
following reasons?
1. Current flows through the diode
vacuum tube in one direction only
2. Current flows through the diode
vacuum tube in both directions
3. The diode vacuum tube conducts
only on the negative alternation of
the input voltage
4. None of the above
3-9.
When the plate of a diode tube is
negative with respect to the cathode,
the tube is said to be in what state?
1. Cutoff
2. Remission
3. Saturation
4. Conduction
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