NAVEDTRA 14179A, NEETS Mod. 7, Ch. 4 Flashcards
Most power supplies are made up of the following four basic sections: transformer, rectifier, filter, and what else?
Regulator
What steps up or steps down the input line voltage and isolates the power supply from the power line?
Transformer
What converts the alternating current input signal to a pulsating direct current?
Rectifier
What maintains the output of the power supply at a constant level in spite of large changes in load current or input line voltages?
Regulator
What provides two equal voltages to the conventional full-wave rectifier?
Center-tapped transformer
What is the conversion of an alternating current to a pulsating direct current?
Rectification
What is current called that flows in pulses in the same direction?
Pulsating DC
Which terms are AC voltages normally specified in?
RMS values
Which type of device has two or more diodes arranged so that load current flows in the same direction during each half cycle of the ac supply?
Full-wave rectifier
How many basic types of filter circuits are there?
Four
What is defined as the time it takes a capacitor to charge to 63.2 percent of the applied voltage or to discharge to 36.8 percent of its total charge?
One time constant
What is the most basic type of power supply filter?
Capacitor filter
Which type of filter is primarily used in power supplies where voltage regulation is important and where the output current is relatively high and subject to varying load conditions?
LC choke-input
What percent of a half-wave rectifier is the ripple frequency of a full-wave rectifier?
200%
Electrolytic capacitors are available in sizes up to how many microfarads or greater?
10,000
What is one of the most commonly used filters primarily used in radio receivers, small audio amplifier power supplies, and in any type of power supply where the output current is low and the load current is relatively constant?
LC capacitor-input filter
115 volts AC can vary from about 105 volts AC to how many volts AC?
125
What gives an indication of how much the output voltage changes over a range of load resistance values?
Figure of merit
Basic voltage regulators are classified as one of what two ways?
Series or Shunt
Which type of diode blocks current until a specified voltage is applied?
Zener diode
Which circuitry provides a constant current output?
Current regulator
What are used primarily to develop high voltages where low current is required?
Voltage multipliers
The DC output of the voltage multiplier ranges from 1000 to how many volts?
30,000
In order for a silicon NPN transistor to conduct, the base must be between how many volts more positive than the emitter?
0.6 to 0.7 volts
What are the two widely used checks in testing electronic equipment?
Signal tracing and Visual
What is a short-circuit protection device that automatically limits the current to a safe value?
Current Limiter
