English

Which method of biasing is used for operating a transistor as amplifier? - Physics

Advertisements
Advertisements

Question

Which method of biasing is used for operating a transistor as an amplifier?

One Line Answer
Short Note

Solution 1

For use as an amplifier, the transistor should be inactive mode. Therefore, the emitter-base junction is forward biased and the collector-base junction is reverse biased. Also, an amplifier uses an emitter bias rather than a base bias.

shaalaa.com

Solution 2

For transistor operating as an amplifier, the emitter-base junction is forward biased while the collector-base junction is reverse biased. 

shaalaa.com
Bipolar Junction Transistor (BJT)
  Is there an error in this question or solution?
Chapter 16: Semiconductor Devices - Exercises [Page 364]

APPEARS IN

Balbharati Physics [English] 12 Standard HSC Maharashtra State Board
Chapter 16 Semiconductor Devices
Exercises | Q 16 | Page 364
SCERT Maharashtra Physics [English] 12 Standard HSC
Chapter 16 Semiconductors Devices
Very Short Answer | Q 4

RELATED QUESTIONS

Draw the circuit symbol of the PNP transistor. 


For a transistor IC = 15 mA, IB = 0.5 mA. What is the current amplification factor?  


Draw the circuit symbol for NPN and PNP transistors. What is the difference in the Emitter, Base, and Collector regions of a transistor? 


The light emitted in an LED is due to


Explain the need for a feedback circuit in a transistor oscillator.


What is rectification?


Sketch the static characteristics of a common emitter transistor and bring out the essential features of input and output characteristics.


Transistor functions as a switch. Explain.


Describe the function of a transistor as an amplifier with the neat circuit diagram. Sketch the input and output wave forms.


A transistor of α = 0.99 and VBE = 0.7 V is connected in the common-emitter configuration as shown in the figure. If the transistor is in the saturation region, find the value of collector current.


A transistor has a voltage gain A. If the amount βA of its output is applied to the input of the transistor, then the transistor becomes oscillator, when ______.


For a transistor, the current ratio 'βdc' is defined as the ratio of ______.


Ve, Vb, and Ve are emitter, base, and collector voltage respectively for npn transistor in CE mode. Amplifier works for the combination of biasing voltage equal to ______.


In an npn transistor, the collector current is 24 mA. If 80% of electrons reach collector, its base current in mA is ______.


In switching circuit, transistor is in ON state, values of IE and lB are 10 mA and 0.8 mA respectively and RL is 2 k`Omega`. If VCE is 7.6 V, then VCC is ____________.


In a transistor, a change of 8.0 mA in the emitter current produces a change of 7.8 mA in the collector current. Then change in the base current is ____________.


A pnp transistor is used in common-emitter mode. If a change of 40 µA in base current brings a change of 2 µA in collector current with 0.04 V in base-emitter voltage, then the input resistance is ____________.


In common emitter amplifier, a change of 0.2 mA in the base current causes a change of 5 mA in the collector current. If input resistance is 2K `Omega` and voltage gain is 75, the load resistance used in the circuit is ______.


A common emitter amplifier has a voltage gain of 50, an input impedance of 100Ω and an output impedance of 2000Ω. The power gain of the amplifier is ______.


A conducting wire has length 'L1' and diameter 'd1'. After stretching the same wire length becomes 'L2' and diameter 'd2' The ratio of resistances before and after stretching is ______.


The reverse bias in a junction diode is changed from 8V to 13V, then the value of the current changes from 40μA to 60μA. The resistance of junction diode will be ______.


A common emitter amplifier circuit built using an n-p-n transistor is shown in the figure. Its DC current gain is 300, RC = 4 kΩ and VCC = 20 V. What is the minimum base current for VCE to reach saturation?

 


The base current in common emitter mode of the transistor changes by 10 µA. If the current gain of the transistor is 50, then change in collector current is ______.


Explain the working of the n-p-n transistor in a common base configuration.


Define β


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×