Exercise: Electronic Devices And Circuits

Questions for: Electronic Devices And Circuits

The voltage across a zener diode
A:
is constant in forward direction
B:
is constant in reverse direction
C:
is constant in both forward and reverse directions
D:
none of the above
Answer: B

Zener diode is always reverse biased.

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In all metals
A:
conductivity decreases with increase in temperature
B:
current flow by electrons as well as by holes
C:
resistivity decreases with increase in temperature
D:
the gap between valence and conduction bands is small
Answer: A

In all metals conductivity decreases (and resistance increases) with increase in temperature.

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n-type semiconductors
A:
are negatively charged
B:
are produced when indium is added as impurity to germanium
C:
are produced when phosphorus is added as impurity to silicon
D:
none of the above
Answer: C

n type semiconductor is produced when pentavalent impurity is added.

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An one sided abrupt junction has 1021/m3 of dopants on the lightly doped side, zero bias voltage and a built-in potential of 0.2 V. The depletion width of abrupt junction.(q = 1.6 x 10-19 C, Îĩr =16, Îĩ0 = 8.87 x 10-12 F/m) is
A:
0.036 nm
B:
0.6 Ξm
C:
3 mm
D:
1.5 mm
Answer: B

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Calculate the resistivity of n-type semiconductor from the following data, Density of holes = 5 x 1012 cm-3. Density of electrons = 8 x 1013 cm-3, mobility of conduction electron = 2.3 x 104 cm2/ V-sec and mobility of holes = 100 cm2/V-sec.
A:
0.43 ÎĐ-m
B:
0.34 ÎĐ-m
C:
0.42 ÎĐ-m
D:
0.24 ÎĐ-m
Answer: B

Resistivity(r) = .

σ = e(neue + nnun).

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