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.Management Sciences
Category: Oscillators
An oscillator differs from an amplifier because it_____________?
A. Has more gain
B. Requires no input signal
C. Requires no d.c. supply
D. Always has the same input
In a certain oscillator Av = 50. The attention of the feedback circuit must be___________?
A. 1
B. 01
C. 10
D. 02
A second condition for oscillations is____________?
A. A gain of 1 around the feedback loop
B. No gain around the feedback loop
C. The attention of the feedback circuit must be one-third
D. The feedback circuit must be capacitive
An oscillator employs___________feedback?
A. Positive
B. Negative
C. Neither positive nor negative
D. Data insufficient
In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is __________?
A. Increased 2 times
B. Decreased 4 times
C. Increased 4 times
D. Decreased 2 times
In an LC transistor oscillator, the active device is___________?
A. LC tank circuit
B. Biasing circuit
C. Transistor
D. None of the above
The piezoelectric effect in a crystal is___________?
A. A voltage developed because of mechanical stress
B. A change in resistance because of temperature
C. A change in frequency because of temperature
D. None of the above
____________is a fixed frequency oscillator?
A. Phase-shift oscillator
B. Hartely-oscillator
C. Colpitt’s oscillator
D. Crystal oscillator
An oscillator converts __________?
A. power into d.c. power
B. power into a.c. power
C. mechanical power into a.c. power
S. none of the above
For an oscillator to properly start, the gain around the feedback loop must initially be_________?
A. 1
B. Greater than 1
C. Less than 1
D. Equal to attenuation of feedback circuit
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