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CBSE - XII Science - Physics - Semiconductor Electronics
Current amplifier
Asked by Www.harshalhire51
20th November 2019,
9:48 PM
CBSE - XII Science - Physics - Semiconductor Electronics
what are the use of transistors and resistors in electric water buzzer please give detailed discription of use these two elements in buzzer circuitory ? and why are they used?
Asked by bhuwnesh16
7th November 2016,
9:53 AM
CBSE - XII Science - Physics - Semiconductor Electronics
draw a circuit diagram to study the study the input characteristics of an npn transistor in common emitter configuration .explain briefly how this arrangement is used to obtain the input/output characteristics of transistor.draw the graphs showing the nature of input /output curves.
draw a circuit diagram to study the study the input characteristics of an npn transistor in common emitter configuration .explain briefly how this arrangement is used to obtain the input/output characteristics of transistor.draw the graphs showing the nature of input /output curves.
Asked by mahamood.iphone
23rd December 2015,
7:27 AM
CBSE - XII Science - Physics - Semiconductor Electronics
when to do reverse baising and when to do fprward baising in case of common emitter and common collector?
and why do we connect high voltage cells in reverse baising ang low voltage cell in forward baising?
it is said that in p n junction in reverse baising have thicker depletion region so in zener diode why do we have thin depletion region even though it works under reverse bais
Asked by
17th November 2015,
9:25 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Please explain the derivation of the expressions for voltage gain and the application of those formulae.
Thank You.
Asked by damarlasumanjali
30th August 2015,
5:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
a student has to study the input and output characteristics of a n-p-n silicon transistor in the comman emitter configration. what kind of a circuit arrangement should he use for this purpose ? draw the typical shape of input characteristics likely to be obtained by him.what do we understand by cutofff ,active and saturation states of the transisstor? in which of these states does the transistoor not remaiin when being used as a switch?
Asked by Kb Aulakh
6th March 2015,
7:26 PM
CBSE - XII Science - Physics - Semiconductor Electronics
whats the difference between half wave retifier and full wave rectifier?
Asked by divyashrisureshbabu
6th October 2014,
7:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
A common emitter low_frequency amplifier has an effective input resistance of 1 kΩ. The collector load resistance is 5 kΩ. On applying a signal, the_base current changes by 10 μA and the collector current changes by 1 mA. what is the power gain of this amplifier?
Asked by Topperlearning User
10th July 2014,
3:03 PM
CBSE - XII Science - Physics - Semiconductor Electronics
The adjoining figure shows a common emitter transistor amplifier which uses a silicon transistor. If the quiescent emitter current is 1 mA what is the base biasing voltage?
Asked by Topperlearning User
10th July 2014,
2:32 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Draw a circuit diagram for use of NPN transistor as an amplifier in common emitter configuration. The input resistance of a transistor is 1000 Ω. On changing its base current bv 10 uA. the collector current increases bv 2 mA. If a load resistance of 5 k Ω is used in the circuit, calculate: (i) The current gain (ii) Voltage gain of the amplifier
Asked by Topperlearning User
10th July 2014,
2:24 PM
CBSE - XII Science - Physics - Semiconductor Electronics
If the common emitter current gain β∞ of the transistor used in the amplifier circuit shown is 200, What will the quiescent base current be equal to if the quiescent emitter current is 1 mA.
Asked by Topperlearning User
10th July 2014,
2:06 PM
CBSE - XII Science - Physics - Semiconductor Electronics
For a common emitter amplifier, the audio signal voltage across collector resistance 2 kΩ is 2V. If the current amplification factor of the transistor is 200 and base resistance is 1.5Ω, the input signal voltage and base current are
Asked by Topperlearning User
10th July 2014,
1:52 PM
CBSE - XII Science - Physics - Semiconductor Electronics
(a) In the figure given below, the input waveform is converted into the output waveform by a device 'X'. Name the device and draw its circuit diagram. (b) State how the oscillations are sustained in a transistor oscillator.
Asked by Topperlearning User
1st July 2014,
1:06 PM
CBSE - XII Science - Physics - Semiconductor Electronics
A transistor is used in common-emitter circuit. When an input signal of 20 mV is added to the base-emitter voltage, the base current changes by 20μA and the collector current changes by 2 mA . The load resistance is 5 kΩ.Calculate : the current gain the input resistance the trans-conductance the voltage gain
Asked by Topperlearning User
1st July 2014,
12:39 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Draw the circuit diagram of a common-emitter amplifier using an n-p-n transistor. What is the phase difference between the input signal and output voltage ? Draw the input and output wave forms of the signal. Write the expression for its voltage gain. State two reasons why a common emitter amplifier is preferred to a common base amplifier
Asked by Topperlearning User
1st July 2014,
11:21 AM
CBSE - XII Science - Physics - Semiconductor Electronics
State briefly the underlying principle of transistor oscillator. Draw a circuit diagram showing how the feed back is accomplished by inductive capacitance. Explain the oscillator action.
Asked by Topperlearning User
1st July 2014,
11:07 AM
CBSE - XII Science - Physics - Semiconductor Electronics
A transistor amplifier circuit is operated with an emitter current of 2 mA. The collector current is 1.98 mA. What is the common emitter current gain (β2dc) of the transistor used in the circuit?
Asked by Topperlearning User
1st July 2014,
10:48 AM
CBSE - XII Science - Physics - Semiconductor Electronics
For an n-p-n transistor in the common-emitter configuration, draw a labelled circuit diagram of an arrangement for measuring the collector current as a function of collector-emitter voltage for at least two different values of base current. Draw the shape of the curves obtained. Define the terms:(i) output resistance and (ii) 'current amplification factor'.
Asked by Topperlearning User
1st July 2014,
10:01 AM
CBSE - XII Science - Physics - Semiconductor Electronics
Explain how the input and output voltages are out of phase by 180o for a common-emitter transistor amplifier.
Asked by Topperlearning User
24th June 2014,
2:36 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Illustrate the cut off, active, and saturation regions on a plot of V0 and Vi for a transistor switch circuit.
Asked by Topperlearning User
4th June 2014,
1:23 PM
