Oscillators

11. Hartley oscillator is commonly used in _________.

1. Radio receivers
2. Radio transmitters
3. TV receivers
4. None of the above

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12. If the crystal frequency changes with temperature, we say that crystal has _________. temperature coefficient

1. Positive
2. Zero
3. Negative
4. None of the above

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13. In a certain oscillator Av = 50. The attention of the feedback circuit must be _________.

1. 1
2. 1
3. 10
4. 2

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14. In a phase shift oscillator, the frequency determining elements are _________.

1. L and C
2. R, L and C
3. R and C
4. None of the above

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15. In a phase shift oscillator, we use _________. RC sections

1. Two
2. Three
3. Four
4. None of the above

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16. In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency_________.

1. Remains the same
2. Decreases
3. Increases
4. Insufficient data

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17. In an LC circuit, when the capacitor is maximum, the inductor energy is _________.

1. Minimum
2. Maximum
3. Half-way between maximum and minimum
4. None of the above

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18. In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is _________.

1. Increased 2 times
2. Decreased 4 times
3. Increased 4 times
4. Decreased 2 times

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19. In an LC oscillator, the frequency of oscillator is _________. L or C.

1. Proportional to square of
2. Directly proportional to
3. Independent of the values of
4. Inversely proportional to square root of

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20. In an LC transistor oscillator, the active device is _________.

1. LC tank circuit
2. Biasing circuit
3. Transistor
4. None of the above

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