Home
Class 12
PHYSICS
If a transistor is used in common -emitt...

If a transistor is used in common -emitter mode as an amplifier,then

A

the base -collector junction is forward biased

B

the base -emitter junction is reverse biased

C

the input signal is connected in series with the voltage applied to the base -emitter junction

D

the input signal is connected in series with the voltage applied to the base -collector junction

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the operation of a transistor in common-emitter mode as an amplifier, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Common-Emitter Configuration**: - In a common-emitter (CE) configuration, the emitter terminal of the transistor is common to both the input and output circuits. The input signal is applied between the base and emitter, while the output is taken from the collector and emitter. 2. **Identify the Transistor Type**: - For this explanation, we will consider an NPN transistor. The operation of the transistor relies on the biasing of its junctions. 3. **Biasing of Junctions**: - In a common-emitter amplifier, the base-emitter junction must be forward-biased for the transistor to conduct. This means that the base voltage must be higher than the emitter voltage. - The base-collector junction, on the other hand, is typically reverse-biased in this configuration. 4. **Input Signal Connection**: - The input signal is applied to the base-emitter junction. This means that the input signal is connected in series with the voltage applied to the base-emitter junction. The input signal modulates the base current, which in turn controls the collector current. 5. **Evaluate the Options**: - **Option A**: Base collector junction is forward biased - **False** (it is reverse biased). - **Option B**: Base emitter junction is reverse biased - **False** (it is forward biased). - **Option C**: The input signal is connected in series with the voltage applied to the base-emitter junction - **True**. - **Option D**: The input signal is connected in series with the voltage applied to the base-collector junction - **False** (it is connected to the base-emitter junction). 6. **Conclusion**: - Based on the analysis, the correct option is **C**: The input signal is connected in series with the voltage applied to the base-emitter junction.
Promotional Banner

Topper's Solved these Questions

  • SEMICONDUCTOR AND DEVICE

    FIITJEE|Exercise ASSIGNMENT PROBLEMS( objective : Level-II)|37 Videos

  • SEMICONDUCTOR AND DEVICE

    FIITJEE|Exercise SOLVED PROBLEMS Objective: Level-I|20 Videos

  • SEMICONDUCTOR AND DEVICE

    FIITJEE|Exercise ASSIGNMENT PROBLEMS(Subjective: Level-I)|40 Videos

  • ROTATIONAL MECHANICS

    FIITJEE|Exercise COMPREHENSION - IV|2 Videos

  • SIMPLE HARMONIC MOTION

    FIITJEE|Exercise Assignment Problems (Objective) (Level-II)|20 Videos

Similar Questions

Explore conceptually related problems

A transistor is used in common emitter mode as an amplifier. Then (1) the base-emitter junction is forward biased (2) the base emitter junction is reverse biased (3) the input signal is connected in series with the voltage applied to the base-emitter junction. (4) the input signal is connected in series with the voltage applied to the base collector junction.

A transistor is used in the common emitter mode as an amplifier . Then

A pnp transistor is used in common-emitter mode in an amplifier circuit. A change of 40 muA in the base current brings a change of 2 mA in collector current and 0.04 V in base emitter voltage. If a load of 6kOmega is used, then also find the voltage gain of the amplifier.

A transistor is used in common-emitter mode in an amplifier circuit. When a signal of 30mV is added to the base-emitter voltage, the base current changes by 30muA and collector current by 3mA. The load resistance is 5kOmega . Calculate (i) the current gain beta_(ac) (ii) the input resistance R_(BE) (iii) transconductance and (iv) voltage gain.

A transistor is used in common-emitter mode in an amplifier circuit. When a signal of 20 mV is added to the base-emitter Voltage, the base current changes by 20 mu A and the Collector current changes by 2mA The load resistance is 5k Omega . Calculate (i ) the factor beta .(ii) the input resistance (iii ) the transconductance and R_(BE) (iv) the voltage gain.

A transistor is used in common-emitter mode in an amplifier circuit. When a signal of 20 mV is added to the base-emitter Voltage, the base current changes by 20 mu A and the Collector current changes by 2mA The load resistance is 5k Omega . Calculate (i ) the factor beta .(ii) the input resistance (iii ) the transconductance and R_(BE) (iv) the voltage gain.

A transistor is used in common - emitter mode on an amplifier circuit . When a signal of 20 mV is added to the base - emitter voltage , the base current changes by 20 mu A and the collector current changes by 2 m . The load resistance is 5 k Omega calculate (a) the factor beta (b) the input resistance R_"in" (c ) the transconuctctance and (d ) the voltage agin .

A transistor is used in common-emitter mode in an amplifier circuit. It is found that when a signal of 20mV is added to the base-emitter voltage, the base current changes by 20muA and collector current changes by 1.5mA . Determine the factor beta, input resistance R_(i) , the transconductance and voltage gain, Given load resistance R_(L)=6kOmega .