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The maximum and minimum voltage of an amplitude modulated signal are 60 V and 20 V respectively. The percentage modulation index will be

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Important Questions on Electronic Devices Semiconductors

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The typical transfer characteristic of a transistor in CE configuration is shown in figure. A load resistor of 2  is connected in the collector branch of the circuit used. The input resistance of the transistor is 0.50 . The voltage gain of the transistor is

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A logic gate circuit has two inputs A and B and output Y. The voltage waveforms of A,B and Y are shown below

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The logic gate circuit is

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At a particular station, the TV transmission tower has a height of 100 m. To triple its coverage range, height of the tower should be increased to
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For a constant collector-emitter voltage of 8 V, the collector current of a transistor reached to the value of 6 mA from 4 mA, whereas base current changed from 20 μA to 25 μA value. If transistor is in active state, small signal current gain (current amplification factor) will be
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A square wave of the modulating signal is shown in the figure. The carrier wave is given by Ct=5sin8πtVolt. The modulation index is

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Identify the solar cell characteristics from the following options :
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In the case of amplitude modulation to avoid distortion the modulation index μ should be :
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An n.p.n transistor with current gain β=100 in common emitter configuration is shown in figure. The output voltage of the amplifier will be

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