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प्रश्न
Gautam went for a vacation to the village where his grandmother lived. His grandmother took him to watch 'nautanki' one evening. They noticed a blackbox connected to the mike lying nearby. Gautam's grandmother did not know what that box was. When she asked this question to Gautam, he explained to her that it was an amplifier.
(i) Which values were displayed by the grandmother? How can inculcation of these values in students be promoted?
(ii) What is the function of an amplifier?
(iii) Which basic electronic device is used in the amplifier?
उत्तर
(i) Following values were displayed by Gautam's grandmother:
(a) Curiosity
(b) Awareness
The inculcation of these values in students can be promoted by positive mental state, improvement in motives and healthy supportive environment.
(ii) The function of an amplifier to increase the amplitude of variation of alternating voltage or current or power.
(iii) Transistor is the basic electronic device used in the amplifier.
APPEARS IN
संबंधित प्रश्न
Write the functions of three segments of a transistor.
For a CE-transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 2 V. Suppose the current amplification factor of the transistor is 100, find the input signal voltage and base current if the base resistance is 1 kΩ.
Draw a circuit diagram of a p-n-p transistor and explain how it works as a transistor amplifier
Draw a circuit diagram of a transistor amplifier in CE configuration.
Define the terms : Input resistance How are these determined using typical input and output characteristics?
With the help of necessary circuit diagram, describe briefly how n-p-n transistor in CE configuration amplifies a small sinusoidal input voltage. Write the expression for the ac current gain
Derive an expression for voltage gain of the amplifier and hence show that the output voltage is in opposite phase with the input voltage.
Draw a labelled diagram of a common emitter amplifier, showing waveforms of the signal voltage and output voltage.
Write the truth table of the following circuit. Name the gate represented by this circuit.
A pnp transistor is used in common-emitter mode in an amplifier circuit. A change of 40 µA in the base current brings a change of 2 mA in collector current and 0.04 V in base emitter voltage. Which of the following is the correct value of the input resistor Rin?
