CBSE Class 12-science Physics Transistors

• How do we bias the junctions of a transistor in common emitter configuration?
• What are Transistors?
• 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?
• Draw a labeled circuit diagram of a common emitter transistor amplifier. Draw its input and the output characteristics. .
• A transistor has a current gain of 30. If the collector resistance is 6kΩ, input resistance is 1kΩ, calculate its voltage gain?
• 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 (β_ac) transconductance and voltage gain.
• The base of a transistor is lightly doped. Explain why?
• In the given figure, is (i) The emitter (ii) collector forward or reverse biased? Justify.
• Define current amplification factor in a common  emitter mode of transistor?
• Calculate emitter current for which β = 100 I_B = 20μA?

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