Advertisements
Advertisements
प्रश्न
When a forward bias is applied to a p-n junction, it ______.
विकल्प
raises the potential barrier.
reduces the majority carrier current to zero.
lowers the potential barrier.
None of the above.
Advertisements
उत्तर
When a forward bias is applied to a p-n junction, it lowers the potential barrier.
Explanation:
When a forward bias is applied to a p-n junction, it lowers the value of potential barrier. In the case of a forward bias, the potential barrier opposes the applied voltage. Hence, the potential barrier across the junction gets reduced.
संबंधित प्रश्न
With the help of neat labelled circuit diagram explain the working of half wave rectifier using semiconductor diode. Draw the input and output waveforms.
Draw its I – V characteristics of photodiode
Plot a graph showing variation of current versus voltage for the material GaAs ?
The graph shown in the figure represents a plot of current versus voltage for a given semiconductor. Identify the region, if any, over which the semiconductor has a negative resistance.
The plate current in a diode is 20 mA when the plate voltage is 50 V or 60 V. What will be the current if the plate voltage is 70 V?
A triode value operates at Vp = 225 V and Vg = −0.5 V.
The plate current remains unchanged if the plate voltage is increased to 250 V and the grid voltage is decreased to −2.5 V. Calculate the amplification factor.
The gain factor of an amplifier in increased from 10 to 12 as the load resistance is changed from 4 kΩ to 8 kΩ. Calculate (a) the amplification factor and (b) the plate resistance.
With reference to a semiconductor diode, what is meant by:
(i) Forward bias
(ii) Reverse bias
(iii) Depletion region
In semiconductor physics, what is meant by:
(i) rectifier
(ii) an amplifier
(iii) an oscillator
Answer the following question.
Why photodiodes are required to operate in reverse bias? Explain.
Of the diodes shown in the following diagrams, which one is reverse biased?
The drift current in a p-n junction is from the ______.
In a semiconductor diode, the barrier potential offers opposition to only
Consider an npn transistor with its base-emitter junction forward biased and collector base junction reverse biased. Which of the following statements are true?
- Electrons crossover from emitter to collector.
- Holes move from base to collector.
- Electrons move from emitter to base.
- Electrons from emitter move out of base without going to the collector.
A Zener of power rating 1 W is to be used as a voltage regulator. If zener has a breakdown of 5 V and it has to regulate voltage which fluctuated between 3 V and 7 V, what should be the value of Rs for safe operation (Figure)?
Differentiate between the threshold voltage and the breakdown voltage for a diode.
With reference to a semiconductor diode, define the depletion region.
What is meant by forward biasing of a semiconductor diode?
An ideal PN junction diode offers ______.
