Why is a vacuum tube called a valve in electronics?

  • A
    It regulates the flow of electrons like a valve regulates the flow of fluid.
  • B
    It acts as a storage device for electrons.
  • C
    It amplifies the voltage signal.
  • D
    It converts alternating current to direct current.

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Similar Questions

In a triode valve,which of the following statements is correct?

The amplification produced by a triode is due to the action of

In an amplifier,the load resistance ${R_L}$ is equal to the plate resistance ${r_p}$. The voltage amplification is equal to:

The current in a triode at anode potential $100 \, V$ and grid potential $-1.2 \, V$ is $7.5 \, mA$. If the grid potential is changed to $-2.2 \, V$, the current becomes $5.5 \, mA$. The value of transconductance $(g_m)$ will be .... $mili \, mho$.

The plate resistance of two triode valves is $2 \, k\Omega$ and $4 \, k\Omega$. The amplification factor of each valve is $40$. The ratio of voltage amplification,when used with a $4 \, k\Omega$ load resistance,will be:

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