NAVEDTRA 14181A, NEETS Mod. 9, Ch. 1 Flashcards
What consists of a coil and a capacitor connected in series or parallel?
Tuned circuit
What phenomenon takes place whenever the characteristics of inductance and capacitance are found in a tuned circuit?
Resonance
In an AC circuit, an inductor produces inductive reactance which causes the current to lag the voltage by how many degrees?
90
What is the opposition a capacitor presents to AC called?
Capacitive reactance
What is the difference called between the individual reactances in a series circuit?
Resultant reactance
Resonant circuits may be designed as series resonant or what else?
Parallel resonant
What is the ability to discriminate between frequencies known as?
Selectivity
What is a parallel-LC circuit often called because it can store energy much as a tank stores liquid?
Tank circuit
What must a circuit have that is completed and has a voltage applied, but has zero current?
Infinite impedance
What is a direct and accurate measure of the quality of an LC circuit?
Q
What governs reactance at a given frequency?
Inductance
What refers to the fact that at resonance, the voltage drop across the reactances are greater than the applied voltage?
Gain
The range of frequencies included between the two frequencies at which the current drops to what percent of its maximum value at resonance is called the bandwidth of the circuit?
70
How many general types can filter circuits be divided into?
Four
What is the electronic filter known as that can pass on the higher-frequency components to a load or to the next circuit?
High-pass filter
What passes on a majority of the low frequencies to the next circuit and rejects or attenuates the higher frequencies?
Low-pass filter
What is the ability of the filter circuit to distinguish between high and low frequencies and to eliminate or reject the unwanted frequencies known as?
Discrimination
What is the ability of the filter circuit to reduce the amplitude of the unwanted frequencies below the level of the desired output frequency known as?
Attenuation
What is the frequency at which the filter circuit changes from the point of rejecting the unwanted frequencies to the point of passing the desired frequency?
Frequency cutoff
The bandpass filter and the band-reject filter are two common types of filters that use which type of circuits?
Resonant
Which type of circuit is used to block the passage of current for a narrow band of frequencies, while allowing current to flow at all frequencies above or below this band?
Band-reject filter
What property of a circuit is the range of frequencies between the half-power points?
Bandwidth
What consists of a combination of capacitors, inductors, and resistors connected so that the filter will either permit or prevent passage of a certain band of frequencies?
Filter circuit
