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Electrical Engineering
Oscillators
Quiz 4
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Q.1
Which of the following is (are) the determining factor(s) of the stability of a feedback amplifier?
A
Phase shift between input and output signals
Both A and the phase shift between input and output signals
None of the above
Q.2
What is the minimum frequency at which a crystal will oscillate?
seventh harmonic
third harmonic
fundamental
second harmonic
Q.3
The attenuation of the three-section RC feedback phase-shift oscillator is
1/9.
1/30.
1/3.
1/29.
Q.4
The feedback signal in a(n) ________ oscillator is derived from an inductive voltage divider in the LC circuit.
Hartley
Armstrong
Colpitts
None of these
Q.5
Which of the following improvements is (are) a result of the negative feedback in a circuit?
Lower output impedance
Reduced noise
More linear operation
All of the above
Q.6
The piezoelectric effect in a crystal is ___________
A voltage developed because of mechanical stress
A change in resistance because of temperature
A change in frequency because of temperature
None of the above
Q.7
In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is ___________
Increased 2 times
Decreased 4 times
Increased 4 times
Decreased 2 times
Q.8
In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency ___________
Remains the same
Decreases
Increases
Insufficient data
Q.9
If the crystal frequency changes with temperature, we say that crystal has ___________ temperature coefficient
Negative
Positive
Zero
None of the above
Q.10
The Q of the crystal is of the order of ___________
100
1000
50
More than 10,000
Q.11
In Colpitt's oscillator, feedback is obtained ___________
By magnetic induction
By a tickler coil
From the centre of split capacitors
None of the above
Q.12
An important limitation of a crystal oscillator is ___________
Its low output
Its high Q
Less availability of quartz crystal
Its high output
Q.13
___________ is a fixed frequency oscillator
Phase-shift oscillator
Hartely-oscillator
Colpitt's oscillator
Crystal oscillator
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