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66 Cards in this Set
- Front
- Back
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1. In a positive-diode counter that provides accurate counting, what is the only variable allowed in the input signal?
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Pulse-repetition frequency
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2. The action of a filter circuit that reduces the amplitude of unwanted frequencies below the amplitude of the desired frequency is known as
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attenuation
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What oscillator uses a tickler coil for feedback?
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Armstrong
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The frequency beyond which a filter circuit no longer passes current is referred to as the
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cutoff frequency
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In a bistable multivibrator, what minimum number of triggers is required to produce one gate?
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Two
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What is the harmonic content of a square wave?
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A combination of odd harmonics only
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If applied to a coil, what voltage waveform will cause a linear rise in current?
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Trapezoidal wave
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What type of damping is caused by (a) high resistance and (b) low resistance?
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(a) Underdamping (b) Overdamping
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What type of feedback aids an input signal?
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Positive
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The Q of a circuit is a measure of circuit
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quality
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Which of the following waveforms could be the output of the astable multivibrator?
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Rectangular wave
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Which of the following waves is NOT a complex wave?
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Sine Wave
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Which of the following terms describes the gradual amplitude reduction in an oscillator?
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Damping
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Why is the crystal in a crystal-controlled oscillator often installed in a temperature controlled oven?
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To provide better frequency stability
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What feature in a Hartley oscillator differs from an Armstrong oscillator?
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Tickler coil
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In a resonant circuit, what is the phase angle between voltage and current?
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180 degrees
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What multivibrator is a square or rectangular-wave generator with only one stable condition?
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Monostable
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What class of biasing does the RC oscillator use?
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A
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In a parallel-resonant circuit, Q is used to figure which of the following circuit values?
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Circulating tank current
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What oscillator uses a tapped coil for feedback?
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Hartley
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What type of feedback is used to sustain oscillations?
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Regenerative
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In a shunt-fed, tuned-collector Armstrong oscillator, what blocks the dc component from the tank circuit?
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A capacitor
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The time constant for full integration in an RC circuit should be what minimum number of times greater than the input pulse duration?
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10
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What is the highest multiplication factor normally used in frequency multipliers?
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Four
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Which of the following statements best describes tank current in a series-fed oscillator?
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The dc path is through the tank circuit
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What term describes the opposition to ac that causes current to lead voltage?
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Capacitive reactance
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In a series-LC circuit, which of the following component characteristics describes circuit action (a) below the resonant frequency and (b) above the resonant frequency?
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(a) Capacitive (b) Inductive
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Which of the following oscillators is used to provide a highly stable output at a very precise frequency?
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Crystal
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In an ac circuit, how does capacitive reactance respond to an increase in applied frequency?
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Capacitive reactance decreases
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Applying synchronizing triggers with a frequency that is SLIGHTLY higher than the free-running frequency will cause a synchronized blocking oscillator to
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lock in at the higher frequency
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What is the harmonic composition within a sawtooth wave?
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Both even and odd harmonics
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The ability of a resonant circuit to separate currents of desired frequencies from those of undesired frequencies makes them useful in which of the following circuit applications?
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Filters
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Why is class A bias used in oscillators?
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To maintain low distortion
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What three circuits are most commonly used as frequency determining devices?
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Crystal-controlled oscillator, RC oscillator, and LC oscillator
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Which of the following circuit values has the greatest effect on the figure of merit of the circuit?
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Resistance
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An IDEAL sinusoidal oscillator would produce which of the following outputs?
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A sine wave of constant frequency and amplitude
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Amplitude stability in an oscillator is the ability to
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maintain a constant amplitude in the output
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What is the fourth harmonic of a 2-megahertz signal?
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8 megahertz
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Which of the following definitions describes the basic oscillator?
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A nonrotating device producing alternating current
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What type of waveform is used to furnish a linear rise in current for electromagnetic cathode ray tubes
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Sawtooth
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How is feedback described?
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Transfer of a portion of the output circuit energy to control the input of the circuit
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Which of the following multivibrators is also called a free running multivibrator?
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Astable
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What type of feedback opposes an input signal?
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Degenerative
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The time required to complete one full cycle of a square wave is referred to as the
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pulse-repetition time
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Frequency stability in an oscillator refer to its ability to
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maintain a constant operating frequency
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In the phase-shift oscillator, a phase shift of 180 degrees for regenerative feedback is provided by what minimum number of RC networks?
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Three
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The blocking oscillator is NOT suitable for which of the following circuit applications?
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Sine-wave generator
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What oscillator uses split capacitors for feedback?
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Colpitts
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What is the primary use for the monostable multivibrator circuit?
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Pulse stretcher
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A tuned-base Hartley oscillator is described as "shunt fed" when
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dc does not flow through the tank circuit
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When an ac circuit is at resonance, what is the relationship between XL and XC
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XL is equal to XC
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Which of the following circuits would be used to fix the upper or lower extremity of a waveform at a specific value?
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Clamper
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In an ac circuit, what is the term that describes the TOTAL opposition to current flow?
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Impedance
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An oscillator that is turned ON for a specific period of time, then is turned OFF and remains OFF until required at a later time, is which of following types?
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Pulsed
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Which of the following pulses is used to change states in a flip flop?
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A Trigger Pulse
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A wave-shaping circuit which restricts some portion of a waveform from exceeding a specified value is known as a/an
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Limiter
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A waveform that repeats the same pattern of changes is a/an
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Periodic Wave
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What is the purpose of a buffer amplifier?
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To prevent load variations from affecting the oscillator
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Which of the following waveforms is sinusoidal?
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Sine Wave
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Which of the following circuit actions is a result of critical damping?
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Rapid transient response without overshoot
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Wave generators are classified according to the
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output wave shape
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What electrical characteristic makes the frequency stability of a crystal better than that of an LC tank circuit?
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Higher Q
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In an ac circuit, how does inductive reactance respond to an increase in applied frequency?
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Inductive reactance increases
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Which of the following circuits is NOT a relaxation oscillator?
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A sinusoidal oscillator
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Which of the following electrical characteristics determines the magnitude of inductive reactance?
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Frequency and inductance
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A sinusoidal oscillator can be regarded as which of the following types of amplifiers?
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One that produces a sine wave
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