While a collector to emitter voltage is constant in a transistor, the collector current changes by $8.2 mA$ when the emitter current changes by $8.3 mA$. The value of forward current ratio $h$ is
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Plate voltage of a triode is increased from $200 V$ to $225 V$. To maintain the plate current, change in grid voltage from $5 V$ to $5.75 V$ is needed. The amplification factor is
When plate voltage in diode valve is increased from $100$ volt to $150$ volt then plate current increases from $7.5\ mA$ to $12\ mA$. The dynamic plastic resistance will be