A) 0.02
B) 0.002
C) 4.5
D) 5.0
Correct Answer: C
Solution :
The ratio of the decrease in plate potential (while grid potential is kept constant) to the increase in grid potential (while plate potential is kept constant) for a definite increase in the plate current is called the amplification factor of the triode valve. \[\mu =\frac{\Delta {{V}_{p}}}{\Delta {{V}_{g}}}\] Given, \[\mu =15,\,\Delta {{V}_{g}}=0.3\,V,\] \[\Rightarrow \] \[\,\Delta {{V}_{p}}=\mu \times \,{{V}_{g}}\] \[\,\Delta {{V}_{p}}=15\times 0.3\] \[\,\Delta {{V}_{p}}=4.5\,V\] Note: \[\mu \]has no unit and its value is always greater than one.
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