Oscillators MCQ
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Attempt Free Oscillators MCQ Here. Read The Important Electricity MCQ From Below.
Q1. An oscillator converts ……………..
ac. power into d.c. power
dc. power into a.c. power
mechanical power into a.c. power
none of the above
Answer : 2
Q2. In an LC transistor oscillator, the active device is ……………
LC tank circuit
Biasing circuit
Transistor
None of the above
Answer : 3
Q3. 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
Answer : 1
Q4. In an LC oscillator, the frequency of oscillator is ……………. L or C.
Proportional to square of
Directly proportional to
Independent of the values of
Inversely proportional to square root of
Answer : 4
Q5. An oscillator produces……………. oscillations
Damped
Undamped
Modulated
None of the above
Answer : 2
Q6. An oscillator employs ……………… feedback
Positive
Negative
Neither positive nor negative
Data insufficient
Answer : 1
Oscillators MCQ
Q7. An LC oscillator cannot be used to produce ……………….. frequencies
High
Audio
Very low
Very high
Answer : 3
Q8. Hartley oscillator is commonly used in ………………
Radio receivers
Radio transmitters
TV receivers
None of the above
Answer : 1
Q9. In a phase shift oscillator, we use …………. RC sections
Two
Three
Four
None of the above
Answer : 2
Q10. In a phase shift oscillator, the frequency determining elements are …………
L and C
R, L and C
R and C
None of the above
Answer : 3
Oscillators MCQ
Q11. A Wien bridge oscillator uses ……………. feedback
Only positive
Only negative
Both positive and negative
None of the above
Answer : 3
Q12. 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
Answer : 1
Q13. If the crystal frequency changes with temperature, we say that crystal has ………….. temperature coefficient
Positive
Zero
Negative
None of the above
Answer : 1
Q14. The crystal oscillator frequency is very stable due to ………………. of the crystal
Rigidity
Vibrations
Low Q
High Q
Answer : 4
Oscillators MCQ
Q15. The application where one would most likely find a crystal oscillator is ……………..
Radio receiver
Radio transmitter
AF sweep generator
None of the above
Answer : 2
Q16. 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
Answer : 2
Q17. One condition for oscillation is ………….
A phase shift around the feedback loop of 180o
A gain around the feedback loop of one-third
A phase shift around the feedback loop of 0o
A gain around the feedback loop of less than 1
Answer : 3
Q18. 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
Answer : 1
Oscillators MCQ
Q19. In a certain oscillator Av = 50. The attention of the feedback circuit must be …………
1
01
10
02
Answer : 4
Q20. 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
Answer : 2
Q21. In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency……….
Remains the same
Decreases
Increases
Insufficient data
Answer : 3
Q22. In Colpitt’s oscillator, feedback is obtained …………….
By magnetic induction
By a tickler coil
From the centre of split capacitors
None of the above
Answer : 3
Oscillators MCQ
Q23. The Q of the crystal is of the order of …………
100
1000
50
More than 10,000
Answer : 4
Q24. Quartz crystal is most commonly used in crystal oscillators because ………….
It has superior electrical properties
It is easily available
It is quite inexpensive
None of the above
Answer : 1
Q25. ………….. is a fixed frequency oscillator
Phase-shift oscillator
Hartely-oscillator
Colpitt’s oscillator
Crystal oscillator
Answer : 4
Q26. 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
Answer : 4
Oscillators MCQ
Q27. An important limitation of a crystal oscillator is ……………
Its low output
Its high Q
Less availability of quartz crystal
Its high output
Answer : 1
Q28. The signal generator generally used in the laboratories is ………….. oscillator
Wien-bridge
Hartely
Crystal
Phase shift
Answer : 1
Oscillators MCQ
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