Analog Electronics - Section 1 (2)
Analog Electronics - Section 1
| 9. | An exponential amplifier has diode in feedback path. |
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Answer: Option B Explanation: It has resistance in feedback path. |
| 10. | The 'h' parameters of the circuit shown in the figure are hib = 25 Ω, hfb = 0.999 and hob = 10-6Ω The Voltage gain is |
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25
| 11. | In class C operation of an amplifier circuit, the collector current exists for |
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Answer: Option D Explanation: In class C operation output is in the form of short duration pulses. |
| 12. | Si transistor of following figure has a = 0.9 and ICE= 0, VEE = 5 V and VCC = 13 V, then RE will be if IEQ = 1 mA |
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| 13. | A bridge rectifier circuit has input of 50 Hz frequency. The load resistance is RL and filter capacitance is C. For good output wave shape, the time constant RLC should be at least equal to |
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Answer: Option D Explanation: Time constant RLC must be about 5 x 20 ms. |
| 14. | A CB amplifier has re = 6 Ω, RL = 600 Ω and a = 0.98. The voltage gain is |
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| 15. | Which power amplifier can deliver maximum load power? |
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Answer: Option D Explanation: Since efficiency of class C operation is high, maximum load power is delivered. |
| 16. | A forward voltage of 9 V is applied to a diode in series with a 1 kΩ load resistor. The voltage across load resistor is zero. It indicates that |
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Answer: Option B Explanation: Since load voltage is zero, the current is zero and diode is open-circuited. If load was open-circuited, load voltage would be about 9 V. |