Oscillator MCQs | Oscillator Objective Type Questions and Answers

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Questions
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

Answer: Its low 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

Answer: 02
29 The crystal oscillator frequency is very stable due to ………………. of the crystal
A Rigidity
B Vibrations
C Low Q
D High Q

Answer: 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

Answer: Positive
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

Answer: Transistor
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

Answer: Minimum
35 An oscillator produces……………. oscillations
A Damped
B Undamped
C Modulated
D None of the above

Answer: Undamped
36 An oscillator employs ……………… feedback
A Positive
B Negative
C Neither positive nor negative
D Data insufficient

Answer: Positive
37 Hartley oscillator is commonly used in ………………
A Radio receivers
B Radio transmitters
C TV receivers
D None of the above

Answer: Radio receivers
38 In a phase shift oscillator, we use …………. RC sections
A Two
B Three
C Four
D None of the above

Answer: Three

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