In a degenerate n type semiconductor material, the Fermi level, is in valence ba

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Question
In a degenerate n type semiconductor material, the Fermi level,
Options
A. is in valence band
B. is in conduction band
C. is at the centre in between valence and conduction bands
D. is very near valence band

Correct Answer

is in conduction band

Explanation

This is due to high level of doping.

Electronic Devices and Circuits problems

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1. The normal operation of JFET is
Options
A. constant voltage region
B. constant current region
C. both constant voltage and constant current regions
D. either constant voltage or constant current region

2. A particular green LED emits light of wavelength 5490, �, the energy bandgap of the semiconductor material used there is .. h = 6.6 x 10^-34 J sec.
Options
A. 2.26 eV
B. 1.98 eV
C. 1.17 eV
D. 0.74 eV

3. Ferrite have
Options
A. low copper loss
B. low eddy current loss
C. low resistivity
D. higher specific gravity compared to iron

4. A silicon (PN) junction at a temperature of 20�C has a reverse saturation current of 10 pico Ampere. The reverse saturation current at 40�C for the same bias is approximately.
Options
A. 30 pA
B. 40 pA
C. 50 pA
D. 60 pA

6. The power dissipation in a transistor is the product of
Options
A. emitter current and emitter to base voltage
B. emitter current and collector to emitter voltage
C. collector current and collector to emitter voltage
D. none of the above

7. In an n-p-n transistor biased for operation in forward active region
Options
A. emitter is positive with respect to base
B. collector is positive with respect to base
C. base is positive with respect to emitter and collector is positive with respect to base
D. none of the above

8. In a zener diode
Options
A. the forward current is very high
B. sharp breakdown occurs at a certain reverse voltage
C. the ratio v-i can be negative
D. there are two p-n junctions

9. As compared to an ordinary semiconductor diode, a Schottky diode
Options
A. has lower cut in voltage
B. has higher cut in voltage
C. lower reverse saturation current
D. both (b) and (c)

10. A periodic voltage has following value for equal time intervals changing suddenly from one value to next... 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10 etc. Then rms value of the waveform is
Options
A. 31 V
B. 32 V
C. insufficient data
D. none of these

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