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• CBSE×
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• Transistors×

Transistors Free Doubts and Solutions

WHY WE USE HIGH POTENTIAL BATTERY IN OUTPUT IN ALL BIASING MODE OF THE TRANSISTOR?

Asked by modi72879 1st December 2017, 11:24 AM

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though transistor is reverse biased , it produces a large amount of current  inspite of a diode which when reverse biased do not allow the current to flow.why?

Asked by vasturushi 19th November 2017, 11:13 AM

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Can you please explain the Input output phase relationship in Common emitter transistor and why it is different from Common Base and Common collector transistors?

Asked by rajuharan 22nd January 2017, 10:44 PM

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Voltage gain of an amplifier with 10 % positive feedback is 10. The voltage gain without feedback is 1. 5 2. 0.5 3. 0.05 4. 50

Asked by rajeshtitu 19th July 2016, 9:13 PM

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dear experts is their any shortcut or tricks to do the diagrams of TRANSISTER IN CE configuration ..the diagram is so complicated to understand .. kindly explain its working also ??

Asked by mrinal456 18th February 2016, 11:28 PM

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Two amplifiers with voltage gain 10 and 20 are connected in series .calculate the output voltage for an input signal of 0.01volt.

Asked by Pavu Taneja 2nd November 2015, 8:22 PM

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When is a transistor said to be in active state? Draw a circuit diagram of a p-n-p transistor and explain how it works as a transistor amplifier. Write clearly, why in the case of a transistor (i) the base is thin and lightly doped and (ii) the emitter is heavily doped.

Asked by Topperlearning User 8th July 2015, 2:32 PM

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why voltmeter is connected in parllel with source battery in npn or pnp?

Asked by Samson Shaji Varghese 27th February 2015, 10:15 AM

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explain pnp and npn transistor

Asked by Sourav Jha 6th February 2015, 8:09 AM

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why is it so that for biasing a transistor the reverse bias voltage should be greater than the forward bias volatage?

Asked by Nishtha Sardana 2nd December 2014, 7:53 AM

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A transistor has a current gain of 30. If the collector resistance is 6kΩ, input resistance is 1kΩ, calculate its voltage gain?

Asked by Topperlearning User 14th November 2014, 7:38 AM

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Calculate emitter current for which β = 100 IB = 20μA?

Asked by Topperlearning User 10th July 2014, 1:13 PM

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The input resistance of a silicon transistor is Ω Its base current is changed by 15μ A, which results in the change in collector current by 2mA. This transistor is used as a common emitter amplifier with a load resistance of 5k Ω. Calculate current gain (βac) transconductance and voltage gain.

Asked by Topperlearning User 10th July 2014, 11:09 AM

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A P-N transistor is used in common - emitter mode in an amplifier circuit. A change of 40μA in the base current brings a change of 2mA in collector current and 0.04V in base  -emitter  voltage, Find (i) input resistance (ii) current amplification factor β. If a load resistance of 6 k oh m is used, then find voltage gain?

Asked by Topperlearning User 10th July 2014, 10:25 AM

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State the principle of working of p-n diode as a rectifier.Explain, with the help of a circuit diagram, the use of p-n diode as a full wave rectifier. Draw a sketch of the input and output waveforms. Or Draw the symbolic representation of a (i) p- n- p, (ii) n- p- n transistor.Why is the base region of transistor thin and lightly doped?With proper circuit diagram, show the biasing of a p- n- p transistor in common base configuration. Explain the movement of charge carriers through different parts of the transistor in such a configuration and show that .

Asked by Topperlearning User 24th June 2014, 9:43 AM

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With the help of a circuit diagram explain the action of npn transistor.

Asked by Topperlearning User 24th June 2014, 9:07 AM

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a) The adjoining figure shows the V-I characteristic of a semiconductor diode : (i) Identify the semiconductor diode used. (ii) Draw the circuit diagram to obtain the given characteristics of this diode. (iii) Briefly explain how this diode can be used as a voltage regulator.   b) In the fig. given along side is (i) the emitter and (ii) the collector forward or reverse biased ?

Asked by Topperlearning User 24th June 2014, 8:58 AM

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Draw a labeled circuit diagram of a common emitter transistor amplifier. Draw the input and the output wave forms and also state the relation between input and output signal?

Asked by Topperlearning User 23rd June 2014, 2:30 PM

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Draw a labeled circuit diagram of a common emitter transistor amplifier. Draw its input and the output characteristics. .

Asked by Topperlearning User 23rd June 2014, 2:16 PM

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Define current amplification factor in a common  emitter mode of transistor?

Asked by Topperlearning User 23rd June 2014, 2:11 PM

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What are Transistors?

Asked by Topperlearning User 23rd June 2014, 11:08 AM

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Draw the transfer characteristic curve of a base biased transistor in CE configuration. Explain clearly how the active region of the Vo versus Vi curve in a transistor is used as an amplifier.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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Output characteristics of an n-pn transistor in CE configuration is shown in the figure. Determine: (i) dynamic output resistance (ii) dc current gain and (iii) ac current gain at an operating point VCE = 10 V, when IB = 30 A.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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In the given circuit diagram, a voltmeter 'V' is connected across a lamp 'L'. How would (i) the brightness of the lamp and (ii) voltmeter reading 'V' be affected, if the value of resistance 'R' is decreased? Justify your answer.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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In a transistor, doping level in base is increased slightly. How will it affect (i) collector current and (ii) base current?

Asked by Topperlearning User 4th June 2014, 1:23 PM

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Can  two pn junction diodes placed back to back work as a pnp transistor ?

Asked by Topperlearning User 4th June 2014, 1:23 PM

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In the given figure, is (i) The emitter (ii) collector forward or reverse biased? Justify.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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The base of a transistor is lightly doped. Explain why?

Asked by Topperlearning User 4th June 2014, 1:23 PM

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How do we bias the junctions of a transistor in common emitter configuration?

Asked by Topperlearning User 4th June 2014, 1:23 PM