Exercise: Electronic Devices And Circuits

Questions for: Electronic Devices And Circuits

The value of a in a transistor
A:
is always equal to 1
B:
is less than 1 but more than 0.9
C:
is about 0.4
D:
is about 0.1
Answer: B

a is about 0.98.

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In a piezoelectric crystal, application of a mechanical stress would produce
A:
plastic deformation of the crystal
B:
magnetic Dipoles in the crystal
C:
electric polarization in the crystal
D:
shift in the Fermi level
Answer: C

Commonly material used as piezoelectric crystal is Barium Nitrate. Generally ferroelectric crystals and piezoelectric.

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The reverse saturation current of a diode does not depend on temperature.
A:
True
B:
False
C:
D:
Answer: B

It increases with increase of temperature.

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Photo electric emission can occur only if
A:
wave length of incident radiation is equal to threshold value
B:
wave length of incident radiation is less than threshold value
C:
frequency of incident radiation is less than threshold frequency
D:
none of the above
Answer: B

The frequency of incident radiation has to be more than threshold value. Wavelength is inversely proportional to frequency.

Therefore wavelength of incident radiation must be less than threshold value.

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Which statement is false as regards holes
A:
Holes exist in conductors as well as semiconductors
B:
Holes constitute positive charges
C:
Holes exist only in semiconductors
D:
Holes and electrons recombine
Answer: A

Holes do not exist in conductors.

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