Advertisements
Advertisements
प्रश्न
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.
विकल्प
d and a
a and b
b and c
a and c
उत्तर
a and c
Explanation:
Transistor: A junction transistor is formed by sandwiching 2 thin layer of P-type semiconductors between two N-type semiconductors. or by sandwiching a thin taver of V-type semiconductors between two P-type semiconductors.
E — Emitter (emits majority charge carriers)
C — Collects majority charge carriers
B — Base (provide proper interaction between E and C)
In normal operation base-emitter is forward biased, i.e., the positive pole of the emitter-base battery is connected to the base and its negative pole is connected to the emitter. And collector-base junction is reverse biased, i.e., the positive pole of the collector base battery is connected to the collector and the negative pole to base. Thus, electron moves from emitter to base and crossovers from emitter to collector.
APPEARS IN
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.
What happens when a forward bias is applied to a p-n junction?
In the following diagram 'S' is a semiconductor. Would you increase or decrease the value of R to keep the reading of the ammeter A constant when S is heated? Give reason for your answer.
In a photo diode, the conductive increases when the material is exposed to light. It is found that the conductivity changes only if the wavelength is less than 620 nm. What is the band gap?
(Use Planck constant h = 4.14 × 10-15 eV-s, Boltzmann constant k = 8·62 × 10-5 eV/K.)
In semiconductor physics, what is meant by:
(i) rectifier
(ii) an amplifier
(iii) an oscillator
We use alloys for making standard resistors because they have ____________.
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.
Can the potential barrier across a p-n junction be measured by simply connecting a voltmeter across the junction?
Draw V-I characteristics of a p-n Junction diode.
What is meant by forward biasing of a semiconductor diode?
