In a diode valve, the state of saturation can be obtained easily by
A
High plate voltage and high filament current
B
Low filament current and high plate voltage
C
Low plate voltage and high cathode temperature
D
High filament current and high plate voltage
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B
Low filament current and high plate voltage
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Before the saturation state of a diode at the plate voltages of $400 V$ and $200 V$ respectively the currents are $i$ and $i$ respectively. The ratio $i / i$ will be
A common emitter amplifier is designed with NPN transistor $(\alpha= 0.99 ).$ The input impedance is $1 K \Omega$ and load is $10 k \Omega$. The voltage gain will be