| ⇦ | 
| ⇨ |
In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho and current gain 25. If the above transistor is replaced with another one with transconductance 0.02 mho and current gain 20, the voltage gain will be
Options
(a) 1.5 G
(b) 1/3 G
(c) 5/4 G
(d) 2/3 G
Correct Answer:
2/3 G
Explanation:
Voltage gain ∆ᵥ = β Rₒᵤₜ / Rᵢₙ
G = 25 Rₒᵤₜ / Rᵢₙ ….(i)
Transconductance gₘ = β / Rᵢₙ
Rᵢₙ = β / gₘ = 25 / 0.03
Puttin g this value of Rᵢₙ in eqn.(i)
G = 25 Rₒᵤₜ / 25 x 0.03 …(ii)
G’ = 20 Rₒᵤₜ / 20 x 0.02 …(iii)
From eqs. (ii) and (iii)
Voltage gain of new transistor G’ = 2/3 G
Related Questions: - The wavelength of the short radio waves, microwaves, ultraviolet waves are λ₁,λ₂ and λ₃
- A planet in a distinct solar system is 10 times more massive than the earth
- Wb/m² is equal to
- The damping force on an oscillator is directly proportional to the velocity.
- A galvanometer having resistance of 50 Ω requires a current of 100μA to give full
Topics: Electronic Devices
(124)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The wavelength of the short radio waves, microwaves, ultraviolet waves are λ₁,λ₂ and λ₃
- A planet in a distinct solar system is 10 times more massive than the earth
- Wb/m² is equal to
- The damping force on an oscillator is directly proportional to the velocity.
- A galvanometer having resistance of 50 Ω requires a current of 100μA to give full
Topics: Electronic Devices (124)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply