Electronic Circuits

11. A transistor amplifier has high output impedance because

1. Emitter is heavily doped
2. Collector is wider than emitter or base
3. Collector has reverse bias
4. Emitter has forward bias

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12. A transistor converts

1. Dc power into ac power
2. Ac power into dc power
3. High resistance into low resistance
4. Low resistance into high resistance

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13. A tuned amplifier is used in what application?

1. Radio frequency
2. Audio frequency
3. Intermediate frequency
4. Low frequency

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14. A tuned amplifier uses what load?

1. Resistive
2. Capacitive
3. LC tank
4. Inductive

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15. A two-transistor class B power amplifier is commonly called

1. Push-pull amplifier
2. Dual amplifier
3. Symmetrical amplifier
4. Differential amplifier

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16. A type of filter which is having a single continuous transmission band with neither the upper nor the lower cut-off frequencies being zero or infinite is called

1. Band stop filter
2. Low pass filter
3. High pass filter
4. Band pass filter

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17. A type of oscillator wherein the frequency is determined by the charge and discharge of resistor-capacitor networks used in conjunction with amplifiers or similar devices.

1. Sine wave oscillator
2. Beta generating circuit
3. Relaxation oscillator
4. Simply an oscillator

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18. AC load line has alan _________ slope compared to that of dc load line.

1. Zero
2. Smaller
3. Bigger
4. Infinite

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19. Amplitude distortion is otherwise known as _________ distortion.

1. Intermodulation
2. Harmonic
3. Phase
4. Resonant

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20. An AF transformer is shielded to

1. Keep the amplifier cool
2. Prevent the induction due to stray magnetic fields
3. Protect from rusting
4. Prevent electric shock

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