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Mixed Quiz
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1RC oscillators can produce almost perfect sine waves at frequencies below 1 MHz.
A)True
B)False


2A sinusoidal oscillator is basically an amplifier with positive feedback.
A)True
B)False


3The frequency where the output of a lead-lag circuit is minimum is called the resonant frequency.
A)True
B)False


4In a phase-shift oscillator, the lead circuits produce a 180° shift and the amplifier provides the additional 90° necessary for oscillation.
A)True
B)False


5The Colpitts oscillator is recognized by the inductive voltage divider used to produce feedback necessary for oscillations.
A)True
B)False


6The capacitive or link coupling loading effect is kept as low as possible to ensure an undistorted sinusoidal output.
A)True
B)False


7When using a BJT oscillator, the loading effect on the tank circuit is much less than with an FET transistor.
A)True
B)False


8A quartz crystal oscillator uses transformer coupling for the feedback signal and can be recognized by a small secondary winding sometimes called a tickler coil.
A)True
B)False


9A Hartley oscillator uses a tapped inductor to provide the feedback signal.
A)True
B)False


10The oscillator is the standard oscillator for frequencies in the range of 5 Hz to about 1 MHz.


11A filter acts like a lead-lag circuit with a changing phase angle.


12When accuracy and stability of oscillation frequency are important, a oscillator is used.


13A frequency change of an oscillator over time caused by temperature, aging, and other causes is referred to as .


14A two-state circuit that has zero, one, or two stable output states is called a(n) .


15PWM allows a low-frequency modulating signal to change the pulse width of a high-frequency signal called the .


16Some function generator ICs are well suited for electronic communications applications since they have an output impedance of Ω.


17A phase-shift oscillator will oscillate if three lead circuits produce a total phase shift of .


18A crystal oscillator that is designed to reduce the effect of stray capacitances is the
A)Colpitts
B)Armstrong
C)FET Clapp
D)Pierce


19A flip-flop is another name for the
A)monostable multivibrator
B)astable multivibrator
C)free running multivibrator
D)bi-stable multivibrator


20An application of the 555 timer sometimes called a voltage-to-frequency converter because the input voltage changes the output frequency is the
A)quartz crystal oscillator
B)twin-T oscillator
C)astable multivibrator
D)voltage-controlled oscillator


21A circuit that produces an output voltage proportional to the phase difference between two input signals is called the
A)VCO
B)carrier
C)multivibrator
D)phase detector


22Which of the following is not a waveform that can be generated by an IC function generator?
A)square
B)triangle
C)stereo
D)pulse


23An amplifier with positive feedback and no external input will
A)play music
B)oscillate
C)blow a fuse
D)do nothing


24A Colpitts oscillator can be recognized by its
A)tickler coil secondary
B)three lead circuits
C)inductive voltage divider
D)capacitive voltage divider


25When accuracy and stability of the oscillation frequency are important, which oscillator is the best choice?
A)Armstrong
B)Colpitts
C)Hartley
D)quartz crystal





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