A triode valve operates at `V_p = 225 V and V_g = - 0.5 V`. The plate current remains unchanged if the plate voltage is increased to `250 V` and the grid voltage is decreased to `-2.5 V`. Calculate the amplification factor.

In the circuit of a triode valve, there is no change in the plate current, when the plate potential is increased from 200 volt to 220 volt and the grid potential is decreased from -0.5 volt to -1.3 volt . The amplification factor of this valve is

The plate voltage of a triode is increased from 225 V to 250 V, the grid voltage is changed from 4 to -4.7V to maintain plate current constant. The amplification factor of the tube is

The plate current in a diode is 20 mA when the plate voltage is 50 V or 60 V . What will be the current if the plate voltage is 70 V ?

The plate current in a diode is 20 mA when the plate voltage is 50 V or 60 V . What will be the current if the plate voltage is 70 V ?

The plate resistance and the amplification factor of a triode are 10 kOmega and 20 . The tube is operated at plate voltage 250 V and grid voltage -7.5 V . The plate current is 10 mA . (a) To what value should the grid voltage be changed so as to increase the plate current to 15 mA ? (b) To what value should the plate voltage be changed to take the plate current back to 10 mA ?