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66 Cards in this Set

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