Coating of strontium oxide on a tungsten cathode in a valve is good for thermionic emission because:

In a diode,when there is a saturation current,the plate resistance will be

The introduction of a grid in a triode valve affects plate current by

In the grid circuit of a triode,a signal $E = 2\sqrt{2} \cos(\omega t)$ is applied. If the amplification factor $\mu = 14$ and the plate resistance $r_p = 10\,k\Omega$,then the root mean square $(RMS)$ current flowing through the load resistance $R_L = 12\,k\Omega$ will be.......$mA$.

The mutual characteristic of a triode is represented by which of the following graphs?

The relation between $I_p$ and $V_p$ for a triode is $I_p = (0.125V_p - 7.5) \text{ mA}$. Keeping the grid potential constant at $1 \text{ V}$,the value of $r_p$ will be . . . . . . $\text{k}\Omega$.