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Electrical Engineering
Oscillators
Quiz 1
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Q.1
In an LC transistor oscillator, the active device is ___________
LC tank circuit
Biasing circuit
Transistor
None of the above
Q.2
___________ is a fixed frequency oscillator
Phase-shift oscillator
Hartely-oscillator
Colpitt's oscillator
Crystal oscillator
Q.3
A second condition for oscillations is ___________
A gain of 1 around the feedback loop
No gain around the feedback loop
The attention of the feedback circuit must be one-third
The feedback circuit must be capacitive
Q.4
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.5
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.6
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.7
For an oscillator to properly start, the gain around the feedback loop must initially be
1
Greater than 1
Less than 1
Equal to attenuation of feedback circuit
Q.8
The application where one would most likely find a crystal oscillator is ___________
Radio receiver
Radio transmitter
AF sweep generator
None of the above
Q.9
An important limitation of a crystal oscillator is ___________
Its low output
Its high Q
Less availability of quartz crystal
Its high output
Q.10
In an LC circuit, when the capacitor is maximum, the inductor energy is ___________
Minimum
Maximum
Half-way between maximum and minimum
None of the above
Q.11
A Wien bridge oscillator uses ___________ feedback
Only positive
Only negative
Both positive and negative
None of the above
Q.12
An oscillator differs from an amplifier because it
Has more gain
Requires no input signal
Requires no d.c. supply
Always has the same input
Q.13
An oscillator produces___________ oscillations
Damped
Undamped
Modulated
None of the above
Q.14
An LC oscillator cannot be used to produce ___________ frequencies
High
Audio
Very low
Very high
Q.15
The Q of the crystal is of the order of ___________
100
1000
50
More than 10,000
Q.16
If the crystal frequency changes with temperature, we say that crystal has ___________ temperature coefficient
Positive
Zero
Negative
None of the above
Q.17
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.18
One condition for oscillation is ___________
A phase shift around the feedback loop of 180°
A gain around the feedback loop of one-third
A phase shift around the feedback loop of 0°
A gain around the feedback loop of less than 1
Q.19
An oscillator converts ___________
a.c. power into d.c. power
d.c. power into a.c. power
mechanical power into a.c. power
none of the above
Q.20
In a phase shift oscillator, the frequency determining elements are ___________
L and C
R, L and C
R and C
None of the above
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