MCQ
A transistor has a current amplification factor of $60$ . In a $CE$ amplifier, input resistance is $1 \,k \Omega$ and output voltage is $0.01 \,V$. The transconductance is (in $SI$ units)
- A$10^{-5}$
- ✓$6 \times 10^{-2}$
- C$6 \times 10^4$
- D$10$
✓
Answer
Correct option: B.
$6 \times 10^{-2}$
b
(b)
(b)
$\beta=\frac{\Delta I_C}{\Delta I_B}=60 \quad R_i=1 \,k \Omega, V_0=0.01\, V$
$g m=\frac{\beta}{R_j}=\frac{60}{1 \times 10^3}=6 \times 10^{-2}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
$a$ conducting loop of radius $R$ is present in a uniform magnetic field $B$ perpendicular the plane of the ring. If radius $R$ varies as a function of time $‘t’$, as $R = R_0+ t$. The $e.m.f$ induced in the loop is
→For a certain radioactive process the graph between $In\, {R}$ and ${t}\,({sec})$ is obtained as shown in the figure. Then the value of half life for the unknown radioactive material is approximately $....\,{sec}.$
→Hydrogen atom is excited from ground state to another state with principal quantum number equal to $4$. Then the number of spectral lines in the emission spectra will be
→When a resistance of 2 ohm is connected across the terminals of a cell, the current is 0.5 A. When the resistance is increased to 5 ohm, the current is 0.25 A. The e.m.f. of the cell is
Two condensers, one of capacity $C$ and other of capacity $C/2$ are connected to a $V-$ volt battery, as shown in the figure. The work done in charging fully both the condensers is
→White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains
Calculate the wavelength of light used in an interference experiment from the following data : Fringe width $=0.03\,cm$. Distance between the slits and eyepiece through which the interference pattern is observed is $1\,m$. Distance between the images of the virtual source when a convex lens of focal length $16\,cm$ is used at a distance of $80\,cm$ from the eyepiece is $0.8\,cm$.
→The electric field intensity at a point in vacuum is equal to:
A loop of irregular shape made of flexible conducting wire carrying clockwise current is placed in uniform inward magnetic field, such that its plane is perpendicular to the field. Then the loop
The kinetic energy of an electron revolving around a nucleus will be