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When the plate voltage applied to a diod...

When the plate voltage applied to a diode valve is changed from `40 V` to `42 V`, the plate current increases from `50 mA to 60 mA`. Calculate the dynamic plate resistance at the operating condition.

Text Solution

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Here `DeltaV_p = 42 V - 40 V = 2 V`
and `Deltai_p = 60 mA - 50 mA = 10 mA`.
Thus, the dynamic plate resistance is
`r_p = (DeltaV_p)/(Deltai_p) = (2 V)/(10 mA) = 200 Omega`.
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HC VERMA-ELECTRIC CURRENT THROUGH GASES-Exercises
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  2. A discharge tube contains helium at a low pressure. A large potential ...

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  3. A molecule of a gas, filled in a discharge tube, gets ionized when an ...

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  4. The mean free path of electrons in the gas in a discharge tube is inve...

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  5. Two discharge tubes have identical material structure and the same gas...

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  6. Calcuate n(T)//n (1000 K) for tungsten emitter at T = 300 K, 2000 K an...

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  7. The saturation current from a thoriated-tungsten cathode at 2000 K is ...

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  8. A Tungsten cathode and a thoriated-tungsten cathode have the same geom...

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  9. If the temperature of a tungsten filament is raised from 2000 K to 201...

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  10. The constant A in the Richardson-Dushman equation for tungsten is 60 x...

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  11. A plate current of 10 mA is obtained when 60 volts are applied across ...

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  12. The plate current in a diode is 20 mA when the plate voltage is 50 V o...

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  13. The power delivered in the plate circuit of a diode is 1.0 W when the ...

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  14. A triode valve operates at Vp = 225 V and Vg = - 0.5 V. The plate curr...

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  15. Calculate the amplification factor of a triode valve which has plate r...

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  16. The dynamic plate resistance of a triode valve is 10 kOmega. Find the ...

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  17. Find the values of rp, mu and gm of a triode operating at plate voltag...

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  18. The plate resistance of a triode is 8 kOmega and the transconductiance...

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  19. The plate resistance and the amplification factor of a triode are 10 k...

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  20. The plate current, plate voltage and grid voltage of a 6F6 triode tube...

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  21. The plate current in a triode can be written as ip = k ((Vg + (Vp)/(...

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