Advertisements
Advertisements
प्रश्न
Which method of biasing is used for operating a transistor as an amplifier?
Advertisements
उत्तर १
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.
उत्तर २
For transistor operating as an amplifier, the emitter-base junction is forward biased while the collector-base junction is reverse biased.
संबंधित प्रश्न
In a BJT, the largest current flow occurs ______.
For a transistor β =75 and IE = 7.5 mA. The value of α is ______
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?
With the help of a neat diagram, explain the working of the npn transistor?
With the help of a neat circuit diagram, explain the transistor as an amplifier?
Explain the current flow in an NPN transistor.
Explain the need for a feedback circuit in a transistor oscillator.
Transistor functions as a switch. Explain.
Assuming VCEsat = 0.2 V and β = 50, find the minimum base current (IB) required to drive the transistor given in the figure to saturation.
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 ______.
A transistor having α = 0.8 is connected in common emitter configuration. When the base current changes by 6 mA, then the change in collector current is ______.
For a transistor, the current ratio 'βdc' is defined as the ratio of ______.
Least doped region in a transistor ____________.
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 ______.
If `alpha`-current gain of a transistor is 0.98. What is the value of `beta`- current gain of the transistor?
ln switching circuit, transistor is in ON state and values of IC and IB are 4.2 mA and 5 µA respectively and RC= l k`Omega` and RB= 300 k`Omega`. If VBE = 0.5 V, find the value of VBB.
Which of the following regions of a transistors are, respectively, heavily dopped and lightly dopped?
A transistor when connected in common emitter mode has a ____________.
In a transistor, doping level in base is increased slightly, the collector current and base current respectively ______.
In transistor amplifier, base-emitter junction is forward biased and collector emitter junction is reverse biased. The current gain is ______.
A transistor is used as a common emitter amplifier with a load resistance 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 ______.
For a transistor, αdc and βdc are the current ratios, then the value of `(beta_"dc"-delta_"dc")/(alpha_"dc".beta_"dc")`
In a p-n-p transistor circuit, the collector current is 10 mA. If 90% of the holes emitted from the emitter reach the collector, ______.
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?
Explain the working of the n-p-n transistor in a common base configuration.
In a CE amplifier, the current gain is 80 and the emitter current is 9 mA. The base current is ______.
Define β
In the case of constants ‘α’ and ‘β’ of a transistor ______.
