Exercise: Electronic Devices And Circuits

Questions for: Electronic Devices And Circuits

For an P-N-P transistor in normal operation its junction are biased as
A:
emitter base : reverse, collector base : forward
B:
emitter base : forward, collector base : reverse
C:
emitter base : forward, collector base : forward
D:
emitter base : reverse, collector base : reverse
Answer: B
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The forbidden band in semiconductors is of the order of
A:
6 eV
B:
1 eV
C:
10 eV
D:
0.01 eV
Answer: B
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Conductivity σ, mobility μ and Hall coefficient KH are related as
A:
μ = σKH
B:
σ = μKH
C:
KH = μσ
D:
KH =(μσ)1.1
Answer: A
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In the schematic representation of bipolar junction transistor, the direction of arrow shows the direction of flow of
A:
holes
B:
electrons
C:
holes in pnp and electrons in npn
D:
electrons in pnp and holes in npn
Answer: A
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If Vr is the reverse voltage across a graded P-N Junction, then the junction capacitance cj is proportional to
A:
(Vr)2
B:
(Vr)n
C:
(Vr)-n
D:
(Vr)3/2
Answer: B
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