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Study MCQ
Electronics Mechanic
OSCILLATORS
Set 3
Set 3
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Q4409
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Which is the transistor used to operate the Colpitts oscillator?
A
AC 127
B
BF 194B
C
BC 148B
D
AC 188
Q4410
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How many time constant period is required to fully charge a capacitor?
A
10 time constants
B
7 time constants
C
5 time constants
D
3 time constants
Q4411
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How to overcome the problem of frequency drift in LC oscillators?
A
Apply opposite polarity of signal
B
Provide negative feedback
C
Using high Q coils and good quality capacitors
D
Increase the supply voltage
Q4412
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Why LC tuned circuits are not used in audio frequency oscillators?
A
LC values required is too large
B
LC components are not available
C
LC tank circuit does not produce AF signals
D
LC tank circuit operation requires high voltage
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