Recombination produces new electron-hole pairs True False Due to recombination t

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Question
Recombination produces new electron-hole pairs
Options
A. True
B. False

Correct Answer

False

Explanation

Due to recombination the number of electron-hole pairs is reduced.

Electronic Devices and Circuits problems

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2. The number of doped regions in PIN diode is
Options
A. 1
B. 2
C. 3
D. 1 or 2

4. A potential of 7 V is applied to a silicon diode. A resistance of 1 K ohm is also in series with the diode. The current is
Options
A. 7 mA
B. 6.3 mA
C. 0.7 mA
D. 0

5. At very high temperatures the extrinsic semi conductors become intrinsic because
Options
A. drive in diffusion of dopants and carriers
B. band to band transition dominants over impurity ionization
C. impurity ionization dominants over band to band transition
D. band to band transition is balanced by impurity ionization

6. 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

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

8. 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

9. 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

10. 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

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