MCQ
In a common base transistor circuit, the current gain is $0.98$. On changing emitter current by $5.00 \,mA$, the change in collector current is ......... $mA$
- A$0.196$
- B$2.45$
- ✓$4.9$
- D$5.1$
✓
Answer
Correct option: C.
$4.9$
c
(c)
(c)
$C B$ - configuration
$\alpha=0.98 \quad \alpha=\frac{\Delta I_C}{\Delta I_E}$
$\Delta I_E=5 mA$
$\Delta I_C=\alpha \Delta I_E=0.98 \times 5 \times 10^{-3}$
$=4.9 \times 10^{-3} \,A$
$=4.9 \,mA$
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
For a telescope to have large resolving power the
A combination of two thin lenses with focal lengths $f_1$ and $f_2$ respectively forms an image of distant object at distance 60 cm when lenses are in contact. The position of this image shifts by 30 cm towards the combination when two lenses are separated by 10 cm . The corresponding values of $f_1$ and $f_2$ are
→Solve the previous question if the closed loop is completely enclosed in the circuit containing the switch.
64 drops each having the capacity C and potential V are combined to form a big drop. If the charge on the small drop is q, then the charge on the big drop will be
In the circuit shown in the figure, find the current in $45\, \Omega$ $..........\,A$
→Image of an object approaching a convex mirror of radius of curvature $20 \mathrm{~m}$ along its optical axis is observed to move from $\frac{25}{3} \mathrm{~m}$ to $\frac{50}{7} \mathrm{~m}$ in 30 seconds. What is the speed of the object in $\mathrm{km}$ per hour?
→The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be
Which arrangement of four identical resistances should be used to draw maximum energy from a cell of voltage $V$
→What was the fissionable material used in bomb dropped at Nagasaki (Japan) in the year 1945 ?
In a sensitive meter bridge apparatus the bridge wire should possess