Q5 of 49 Page 351

The anode of a thermionic diode is connected to the negative terminal of a battery and the cathode to its positive terminal.

When cathode is connected to positive terminal and anode to negative terminal electrons will not able to leave the surface of cathode and hence no thermionic emission will be accounted. This will result in no current passing through diode.

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3

Let i0 be the thermionic current from a metal surface when the absolute temperature of the surface is T0. The temperature is slowly increased and the thermionic current is measured as a function of temperature. Which of the following plots may represent the variation in (i/i0) against (T/T0)?


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When the diode shows saturated current, dynamic plate resistance is

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A diode, a resistor and a 50 Hz AC source are connected in series. The number of current pulses per second through the resistor is

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A triode is operated in the linear region of its characteristics. If the plate voltage is slightly increased, the dynamic plate resistance will