# Oscillators

• ## 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
Explanation:

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• ## A Wien bridge oscillator uses ______ feedback.

• A. Only positive
• B. Only negative
• C. Both positive and negative
• D. None of the above
Explanation:

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• ## An oscillator produces______ oscillations.

• A. Damped
• B. Undamped
• C. Modulated
• D. None of the above
Explanation:

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• ## 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
Explanation:

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• ## 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
Explanation:

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• ## For an oscillator to properly start, the gain around the feedback loop must initially be_____.

• A. 1
• B. Greater than 1
• C. Less than 1
• D. Equal to attenuation of feedback circuit
Explanation:

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• ## 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
Explanation:

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• ## In an LC oscillator, the frequency of oscillator is _______ L or C.

• A. Proportional to square of
• B. Directly proportional to
• C. Independent of the values of
• D. Inversely proportional to square root of
Explanation:

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• ## An LC oscillator cannot be used to produce _______ frequencies.

• A. High
• B. Audio
• C. Very low
• D. Very high
Explanation:

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• ## In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is_____.

• A. Increased 2 times
• B. Decreased 4 times
• C. Increased 4 times
• D. Decreased 2 times