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61 Cards in this Set
- Front
- Back
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The control of an output signal by an input signal resulting in the output signal having some (or all) of the characteristics of the input signal is known by which of the following terms?
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Amplification
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Which of the following statements describes the relationship of input and output signals in an amplifier?
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The input signal remains unchanged and the output signal is controlled by the input signal.
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Why are amplifiers used in electronic devices?
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To provide signals of usable amplitude
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Most amplifiers can be classified in which of the following ways?
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Function and frequency response
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The speaker system of a record player should be driven by which of the following types of amplifier?
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An audio power amplifier
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Which of the following is NOT a class of operation for an amplifier?
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AC
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If the output of a circuit should be a representation of less than one-half of the input signal, what class of operation should be used?
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C
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What class of operation is the most efficient?
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C
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What class of operation has the highest fidelity?
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A
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Which of the following is NOT a method of coupling amplifier stages?
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Resistor
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What is the most commong form of coupling?
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RC
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Which of the following types of coupling is usually used to couple the output from a power amplifier?
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Transformer
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Which of the following types of amplifiers have both high and low frequency response limitations?
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RC
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Which of teh following types of coupling is most effective at high frequencies?
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Direct
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For maximum power transfer between circuits, what impedance relationship should there be between two circuits?
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The output impedance of circuit number one should be equal to the input impedance of circuit number two.
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For maximum current at the input to a circuit, what should the relationship of the input impedance be to the output impedance of the previous stage?
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Equal to
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What is the ___ input impedance and ____ output impedance of a common-base transistor configuration?
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Low; high
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What transistor configuration should be used to match a high output impedance to a low input impedance?
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Common collector
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What type of coupling is most useful for impedance matching?
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Transformer
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What type of feedback provides an increased amplitude output signal?
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Positive
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Distortion caused by amplifier saturation can be reduced by using which of the following types of feedback?
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Negative
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What are the ___ inputs and ____ outputs of a phase splitter?
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one signal;
two signals out of phase |
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A single-stage, two transistor amplifier that uses a phase splitter input is classified as what type of amplifier?
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Push-pull
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What is the advantage of a push-pull amplifier as compared to a single transistor amplifier?
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High gain
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To provide good fidelity output signals, which of the following classes of operation CANNOT be used by a push pull amplifier?
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C
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What type of feedback is caused by interelectrode capacitance?
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Negative
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What happens to capacitive reactance as frequency decreases?
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It increases
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What happens to inductive reactance as frequency increases?
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It increases
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What is the major factor that limits the high frequency response of an amplifier?
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Capacitance
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What type of feedback is provided if teh feedback signal is out of phase with the input signal?
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Negative
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What components can be used to increase the high-frequency response of an amplifier?
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Inductors
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What is the arrangement of both "series" and "shunt" peaking components called?
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Combination
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Which of the following componenets in a transistor amplifier circuit tends to limit the low-frequency response of an amplifier?
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The coupling capacitor
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What is the effect of the gain of an amplifier if the input-signal developing impedance is decreased?
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It increases
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What is the effect on the gain of an amplifier if the output-signal-developing impedance is increased?
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It increases
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What is/are the purpose(s) of a frequency-determining network in an rf amplifier?
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To provide maximum impedance at a given frequency.
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Of the following networks, which could be used as a frequency-determining network for an rf amplifier?
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A parallel LC network
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What is the most common form of coupling for an rf amplifier?
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Transformer
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Which of the following advantages are provided by transformer coupling?
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Fewer parts are used
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If a current gain is desired, which of the following elements/networks should be used as an output-coupling device?
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A step-down transformer
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Which of the following techniques would cause a too-narrow bandpass in an rf amplifier?
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A loosely coupled transformer
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Which of the following techniques would casue low gain at the center frequency of an rf amplifier?
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An overcoupled transformer
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What type of transformer coupling should be used in an rf amplifier?
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Optimum
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Which of the following methods provides the widest band-pass in an rf amplifier?
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A swamping resistor
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Which of the following types of feedback is sually caused by the base-to-collector interelectrode capacitance?
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Negative
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In an rf amplifier an unwanted signal is coupled through the base-to-collector interelectrode capacitance. This problem can be solved by providing feedback out of phase with the unwanted signal. What is this technique called?
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Neutralization
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What ist he maximum number of possible inputs in a differential amplifier?
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Two
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What is the maximum number of possible outputs in an differential amplifier?
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Two
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Which of the following is NOT a requirement for an operational amplifier?
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Very high output impedance
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Which of the following types of components are used in most operational amplifiers?
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Integrated Circuits
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If degenerative feedback is used in an operational-amplieifer circuit, which of the following terms describes the circuit configuration?
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Closed loop
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A magnetic amplifier can be classified sa which of the following types of amplifier?
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Audio Amplifier
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Which of the following statements describes the basic operating principle of a magnetic amplifier?
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A changing inductance can be used to control the current in a load.
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What happens to the true power in a series LR circuit if the inductance is decreased?
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It increases
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If the permeability of the core of a coil decreases, what happens to the inductance and the true power in the circuit?
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Inductance decreases
True power increases |
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If the current in an iron-coil is icreased to a larve value (from the operating point) what happens to the permeability of the core?
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It decreases
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A magnetic amplifier should be operated on what portion of the magnetization curve?
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the knee
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A toroidal core is used in a saturable-core reactor to conteract which of the following effects?
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the effect of load flux on control flux
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Whiy is a rectifier used in a magnetic amplifier?
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To eliminate hysteresis loss
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What can be used to set a magnetic amplifier to the proper operating poijnt and leave the control winding free to accept input signals?
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A bias winding
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A magnetic amplifier would NOT be used in which of the following devices?
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A wideband audio power amplifier system
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