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The total energy of an LC tank circuit remains constant.

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Important Questions on Electronics and Communication

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Transfer characteristics [output voltage V0 vs input voltage Vi] for a base biased transistor in CE configuration is as shown in the figure. For using transistor as a switch, it is used

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A transistor is used as a common emitter amplifier with a load resistance of 2 kΩ. The input resistance is 150 Ω. Base current is changed by 20 μA which results in a change in collector current by 1.5 mA. The voltage gain of the amplifier is
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The transfer characteristic curve of a transistor, having input and output resistance 100 Ω and 100 kΩ respectively, is shown in the figure. The voltage and power gain, are respectively:
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In the following common emitter circuit, β=100 and VCE=7 V. If VBE is negligible, then the base current is

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An unknown transistor needs to be identified as a npn or pnp type. A multimeter, with +ve and -ve terminals, is used to measure resistance between different terminals of transistor. If terminal 2 is the base of the transistor then which of the following is correct for a pnp transistor?
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For transistor action, which of the following statements is correct?
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An NPN transistor is used in common emitter configuration as an amplifier with 1 kΩ load resistance. Signal voltage of 10 mV is applied across the base-emitter. This produces a 3 mA change in the collector current and 15 μA  change in the base current of the amplifier. The input resistance and voltage gain are:
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For a CE transistor amplifier the audio signal voltage across the collector resistance of 2kΩ is 2 V. The current amplification factor of the transistor is 100 . If the base resistance is 1kΩ, the input signal voltage and base current are respectively
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A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement in a common emitter transistor configuration is :
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The ratio (R) of output resistance r0, and the input resistance ri in measurements of input and output characteristics of a transistor is typically in the range :
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In the circuit shown, the value of β of the transistor is 48. If the supplied base current is 200 μA, what is the voltage at the terminal Y?

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In the figure, given that VBB supply can vary from 0 to 5.0 V, VCC=5 V, βdc=200, RB=100 , RC=1  and VBE=1.0 V. The minimum base current and the input voltage at which the transistor will go to saturation, will be, respectively:

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In a transistor circuit, the collector current is changed by 89 mA, if the emitter current is changed to 9.0 mA. The value of current amplification factor, β is
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The output characteristics of a transistor is shown in the figure. When VCE is 10V and IC=4.0mA, then value of βac is 

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Let ie, ic and ib represent emitter current, collector current and the base current of a transistor, then
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In a common base circuit, collector base voltage changes by 0.6 V and collector current changes by 0.02 mA. Then, the output resistance is
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The dc common-emitter current gain of a N-P-N transistor is 50 . The potential difference applied across the collector and emitter of a transistor used in CE configuration is, VCE=2V. If the collector resistance, RC=4 KΩ, the base current IB and the collector current IC will be:
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A common emitter amplifier circuit, built using an NPN transistor, is shown in the figure. Its dc current gain is 250RC=1  and VCC=10 V . The minimum base current for VCE to reach saturation is

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For a common emitter configuration, if α and β have their usual meanings, the correct relationship between α and β is:
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An n-p-n transistor has three leads A, B and C. Connecting B and C by moist fingers, A to the positive lead of an ammeter, and C to the negative lead of the ammeter, one finds large deflection. Then, A, B and C refer respectively to :