A diode, a resistor and a 50Hz AC source are connected in series. The number of current pulses per second through the resistor is:
- A25
- ✓50
- C100
- D200
Answer: B.
View full solution →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
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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.
The plate current in a diode is zero. It is possible that:
- AThe plate voltage is zero.
- BThe plate voltage is slightly negative.
- CThe plate voltage is slightly positive.
- ✓All of the above
Answer: D.
View full solution →Mark the correct options:
- AA diode valve can be used as a rectifier.
- BA triode valve can be used as a rectifier.
- CA triode valve can be used as an amplifier.
- ✓All of the above
Answer: D.
View full solution →Electric conduction takes place in a discharge tube due to the movement of:
- APositive ions.
- BNegative ions.
- CElectrons.
- ✓All of the above
Answer: D.
View full solution →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.
- BA large current will pass through the diode from the anode to the cathode.
- CA large current will pass through the diode from the cathode to the anode.
- DThe diode will be damaged.
Answer: A.
View full solution →Because to the space charge in a diode valve:
- The plate current decreases.
- The plate voltage increases.
- The rate of emission of thermions increases.
- The saturation current increases.
Let $\text{i}_0$ be the thermionic current from a metal surface when the absolute temperature of the surface is $\text{T}_0$. The temperature is slowly increased and the thermionic current is measured as a function of temperature. Which of the following plots may represent the variation in $\Big(\frac{\text{i}}{\text{i}_0}\Big)$ against $\Big(\frac{\text{T}}{\text{T}_0}\Big)?$
View full solution →The amplification factor of a triode operating in the linear region depends strongly on:
- The temperature of the cathode.
- The plate potential.
- The grid potential.
- The separations of the grid from the cathode and the anode.
When the diode shows saturated current, dynamic place resistance is:
- AZero.
- ✓Infinity.
- CIndeterminate.
- DDifferent for different diodes.
Answer: B.
View full solution →The figure shows two identical triode tubes connected in parallel. The anodes are connected together and the cathodes are connected together. Show that the equivalent plate resistance is half the individual plate resistance, the equivalent mutual conductance is double the
individual mutual conductance and the equivalent amplification factor is the same as the individual amplification factor.
individual mutual conductance and the equivalent amplification factor is the same as the individual amplification factor.
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