Exercise: Electronic Devices And Circuits

Questions for: Electronic Devices And Circuits

When a ferromagnetic substance is magnetised, there are small changes in its dimensions. This phenomenon is called
A:
hysteresis
B:
magnetostriction
C:
diamagnetism
D:
bipolar relaxation
Answer: B
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The saturation current in a semi-conductor diode
A:
depends on forward voltage
B:
depends on reverse voltage
C:
is due to thermally generated minority carriers
D:
none of the above
Answer: C
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Ferromagnetic materials exhibit
A:
a linear B-H behaviour
B:
a non-linear B-H behaviour
C:
an exponential B-H behaviour
D:
none of the above
Answer: B
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The current gain of a BJT is
A:
gm r0
B:
gm/r0
C:
gm rp
D:
gm/rp
Answer: C
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Which quantity controls the effectiveness of LED in emitting light?
A:
Applied voltage
B:
Current
C:
Extent of doping
D:
Temperature
Answer: D
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