Exercise: Electronic Devices And Circuits

Questions for: Electronic Devices And Circuits

When electronic emission occurs due to bombardment of high velocity electrons on a metal surface, it is called secondary emission.
A:
True
B:
False
C:
D:
Answer: A
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For insulators the energy gap is of the order of
A:
0.1 eV
B:
0.7 eV
C:
1.1 eV to 1.2 eV
D:
5 to 15 eV
Answer: D
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Hall's effect can be used to measure
A:
magnetic field intensity
B:
average number of holes
C:
carriers concentration
D:
electrostatic field intensity
Answer: A
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The Ni-Zn ferrites are used for audio and TV transformers is that
A:
they have large saturation magnetisation
B:
they are easy to fabricate by rolling
C:
they are free from pores and voids
D:
they have high electro-resistivity
Answer: A
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A P-N junction diode dynamic conductance is directly proportional to
A:
the applied voltage
B:
the temperature
C:
its current
D:
thermal voltage
Answer: C
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