MHT CET · Physics · Semiconductors
In common emitter transistor amplifier, load resistance is \(6.5 \mathrm{k} \Omega\) and an input resistance is \(1.3 \mathrm{k} \Omega\). If the current gain is 78 , the voltage gain is
- A 780
- B 390
- C 260
- D 50
Answer & Solution
Correct Answer
(B) 390
Step-by-step Solution
Detailed explanation
\(\begin{aligned} & \text { Current gain } \beta=78 \\ & \begin{aligned} \text { Voltage gain } & =\beta \times \frac{\mathrm{R}_{\mathrm{L}}}{\mathrm{R}_{\mathrm{in}}}=78 \times \frac{6.5 \times 10^3}{1.3 \times 10^3} \\ & =390\end{aligned}\end{aligned}\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A particle is performing simple harmonic motion and if the oscillations are damped oscillations then the angular frequency is given byMHT CET 2024 Easy
- An electron jumps from the \(4^{\text {th }}\) orbit to the \(2^{\text {nd }}\) orbit of hydrogen atoms. Given the Rydberg's constant \(\mathrm{R}_{\mathrm{H}}=10^7 \mathrm{~m}^{-1}\). frequency in \(\mathrm{Hz}\) of the emitted radiation is \(\left(\mathrm{c}=3 \times 10^8 \mathrm{~m} / \mathrm{s}\right.\) )MHT CET 2022 Medium
- On increasing the reverse bias to a large value in a P-N junction diode, currentMHT CET 2023 Easy
- Two objects of masses ' \(m_1\) ' and ' \(m_2\) ' are moving in the circles of radii ' \(r_1\) ' and ' \(r_2\) ' respectively. Their respective angular speeds ' \(\omega_1\) ' and ' \(\omega_2\) ' are such that they both complete one revolution in the same time ' \(t\) '. The ratio of linear speed of ' \(\mathrm{m}_2\) ' to that of ' \(\mathrm{m}_1\) ' isMHT CET 2024 Medium
- The mean electrical energy density between plates of a charged air capacitor is (where \(\mathrm{q}=\) charge on capacitor, \(\mathrm{A}=\) Area of capacitor plate)MHT CET 2023 Medium
- A straight wire of length \(0 \cdot 5 \mathrm{~m}\) and carrying current of \(1 \cdot 2 \mathrm{~A}\) is placed in a uniform magnetic field of induction \(2 \mathrm{~T}\). The magnetic field is perpendicular to the length of the wire. What is the force acting on the wire? \(\left[\sin 90^{\circ}=1\right]\)MHT CET 2020 Easy
More PYQs from MHT CET
- Which among the following elements has only one electron in valence shell?MHT CET 2022 Easy
- Two cards are drawn successively with replacement from a well shuffled pack of 52 cards. Let X denote the random variable of number of jacks obtained in the two drawn cards. Then \(\mathrm{P}(\mathrm{X}=1)+\mathrm{P}(\mathrm{X}=2)\) equalsMHT CET 2024 Hard
- If the points \(A(5, k), B(-3,1)\) and \(C(-7,-2)\) are collinear, then \(\mathrm{k}=\)MHT CET 2020 Easy
- In successive emission of \(\alpha\) -and \(\beta\) -particles, the number of \(\alpha\) -and \(\beta\) -particles should be emitted for the conversion of \({ }_{92} \mathrm{U}^{238}\) to \({ }_{82} \mathrm{~Pb}^{206}\) areMHT CET 2008 Medium
- \(\int \frac{x+1}{x^{2}+5 x+6} d x=\)MHT CET 2020 Easy
- Calculate the \(\mathrm{E}_{\text {cell }}\) for \(\mathrm{Zn}_{(\mathrm{s})}\left|\mathrm{Zn}_{(0.1 \mathrm{M})}^{++}\right|\left|\mathrm{Cr}_{(0.1 \mathrm{M})}^{+++}\right| \mathrm{Cr}_{(\mathrm{s})}\) at \(25^{\circ} \mathrm{C}\) if \(\mathrm{E}_{\text {cell }}^{\circ}\) is \(0.02 \mathrm{~V}\)MHT CET 2023 Easy