Transistor

In common emitter transistor as shown in Fig., the V_(BB) supply can be varied from 0 V to 5.0V. The Si. Transistor has beta_(ac)=250 and R_(B)=100kOmega, R_(c)=1k Omega,V_(C C)=5.0V . Assume that when the transistor is saturated, V_(CE)=0V and V_(BE)=0.8V . Calculate the minimum base current, for which the transistor will reach saturation. Hence, determine V_(i) when the transistor is 'switched on' find ranges of V_(i) for which the transistor is switched off and switched on.

A box contains 15 transistors, 5 of which are defective. An inspector takes out one transistor at random, examines it for defects, and replaces it. After it has been replaced another inspector does the same thing, and then so does a third inspector. The probability that at least one of the inspectors find a defective transistor is equal to :

(a) Differentiate between three segments of a transistor on the basis of their size and level of doping. (b) How is a transistor biased to be in active state? (c) With the help of a 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.

For a common emitter transistor amplifier, the audio signal voltage across the collector resistance of 2 kOmega is 2 V. Suppose the current amplification factor of the transistor is 100, the base current if base resistance is 1 k Omega is

In a CE transistor amplifier, the audio signal voltage across the collector resistance of 2kOmega is 2V . If the base resistance is 1kOmega and the current amplification of the transistor is 100, the input signal voltage is:

The current transfer ratio beta of a transistor is 100. The input resistance of the transistor when used in common emitter mode is 1 kilo ohm. The peak value of the collector alternating current for an input peak voltage of 0.01 volt is

(a) Describe briefly the functions of the three segments of n-p-n transistor. (b) Draw the circuit arrangment for studying the output characterstics of n-p-n transistor in CE configuration. Explain how the output characterstics is obtained.

In a transistor the current amplification alpha is '0.9', when connected in common base configuration. Now if the same transistor is connected in common emitter configurations and the change in ouput current is 4.5 mA, then the corresponding charnge in the input current is

In a CE transistor amplifier, the audio signal voltage across the collector resistance of 2kOmega is 2V . If the base resistance is 1kOmega and the current amplification of the transistor is 100, the input signal voltage is:

For CE transistor amplifier, the audio signal voltage across the collector resistance of 2 kOmega is 4V. If the current amplification factor of the transistor is 100 and the base resistance is 1kOmega , then the input signal voltage is