A diode, a resistor and a 50Hz AC source are connected in series. The number of current pulses per second through the resistor is:
- 25
- 50
- 100
- 200
Question types
Electric Current through Gases question types
49 questions across 2 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
49
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2
Question groups
5
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Sample Questions
Electric Current through Gases questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
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The plate current in a diode is zero. It is possible that:
- The plate voltage is zero.
- The plate voltage is slightly negative.
- The plate voltage is slightly positive.
- The temperature of the filament is low.
Mark the correct options:
- A diode valve can be used as a rectifier.
- A triode valve can be used as a rectifier.
- A diode valve can be used as an amplifier.
- A triode valve can be used as an amplifier.
Electric conduction takes place in a discharge tube due to the movement of:
- Positive ions.
- Negative ions.
- Electrons.
- Protons.
The anode of a thermionic diode is connected to the negative terminal of a battery and the cathode to its positive terminal:
- No appreciable current will pass through the diode.
- A large current will pass through the diode from the anode to the cathode.
- A large current will pass through the diode from the cathode to the anode.
- The diode will be damaged.
A triode has mutual conductance = 2.0milli mho and plate resistance $=20\text{k}\Omega$ It is desired to amplify a signal by a factor of 30. What load resistance should be added in the circuit?
View full solution →The plate resistance of a triode is $8\text{k}\Omega$ and the transconductance is 2.5 milliohm. (a) If the plate voltage is increased by 48V and the grid voltage is kept constant, what will be the increase in the plate current? (b) With plate voltage kept constant at this increased value, by how much should the grid voltage be decreased in order to bring the plate current back to its initial value?
View full solution →Find the values of $\text{r}_\text{p},\ \mu$ and gm of a triode operating at plate voltage 200V and grid voltage -6. The plate characteristics are shown in the figure.
View full solution →The plate current in a triode can be written as $\text{i}_\text{p}=\text{k}\Big(\text{V}_\text{g}+\frac{\text{V}_\text{p}}{\mu}\Big)^{\frac{3}{2}}$ Show that the mutual conductance is proportional to the cube root of the plate current.
View full solution →A plate current of 10mA is obtained when 60 volts are applied across a diode tube. Assuming the Langmuir-Child equation $\text{i}_\text{p}\propto\text{V}_\text{p}^{\frac{3}{2}}$ to hold, find the dynamic resistance rp in this operating condition.
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