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Free download in PDF Oscillator Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, NEET, AIIMS etc. These short solved questions or quizzes are provided by Gkseries.
(21)
In Colpitt’s oscillator, feedback is obtained …………….
[A]
By magnetic induction
[B]
By a tickler coil
[C]
From the centre of split capacitors
[D]
None of the above
Answer: From the centre of split capacitors
(22)
………….. is a fixed frequency oscillator
[A]
Phase-shift oscillator
[B]
Hartely-oscillator
[C]
Colpitt’s oscillator
[D]
Crystal oscillator
Answer: Crystal oscillator
(23)
An important limitation of a crystal oscillator is ……………
[A]
Its low output
[B]
Its high Q
[C]
Less availability of quartz crystal
[D]
Its high output
(24)
Which of the following is not an LC oscillator?
[A]
Hartley Oscillator
[B]
Colpitts oscillator
[C]
Crystal oscillator
[D]
Clapp oscillator
Answer: Crystal oscillator
(25)
Which type of oscillators are used in timing elements?
[A]
RC oscillator
[B]
LC oscillator
[C]
Crystal oscillator
[D]
None of the above
Answer: Crystal oscillator
(26)
Which of the following oscillator is will give most stable output oscillation frequency?
[A]
Colpitts oscillator
[B]
Clapp oscillator
[C]
Wein bridge oscillator
[D]
Crystal oscillator
Answer: Crystal oscillator
(27)
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
Answer: A gain of 1 around the feedback loop
(28)
In a certain oscillator Av = 50. The attention of the feedback circuit must be …………
[A]
1
[B]
01
[C]
10
[D]
02
(29)
The crystal oscillator frequency is very stable due to ………………. of the crystal
[A]
Rigidity
[B]
Vibrations
[C]
Low Q
[D]
High Q
(30)
A Wien bridge oscillator uses ……………. feedback
[A]
Only positive
[B]
Only negative
[C]
Both positive and negative
[D]
None of the above
Answer: Both positive and negative
31
If the crystal frequency changes with temperature, we say that crystal has ………….. temperature coefficient
[A]
Positive
[B]
Zero
[C]
Negative
[D]
None of the above
32
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
Answer: Requires no input signal
33
In an LC transistor oscillator, the active device is ……………
[A]
LC tank circuit
[B]
Biasing circuit
[C]
Transistor
[D]
None of the above
34
In an LC circuit, when the capacitor is maximum, the inductor energy is ……….
[A]
Minimum
[B]
Maximum
[C]
Half-way between maximum and minimum
[D]
None of the above
35
An oscillator produces……………. oscillations
[A]
Damped
[B]
Undamped
[C]
Modulated
[D]
None of the above
36
An oscillator employs ……………… feedback
[A]
Positive
[B]
Negative
[C]
Neither positive nor negative
[D]
Data insufficient
37
Hartley oscillator is commonly used in ………………
[A]
Radio receivers
[B]
Radio transmitters
[C]
TV receivers
[D]
None of the above
38
In a phase shift oscillator, we use …………. RC sections
[A]
Two
[B]
Three
[C]
Four
[D]
None of the above
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