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Semiconductor Electronics: Materials, Devices and Simple Circuits

Multiple Choice Questions

131.

In the figure shown, if the diode forward voltage drop is 0.2 V, the voltage difference between A and B is

2.2 V
1.3 V
0
0.5 V

132.

Which of the following semi-conducting device is used as voltage regulator ?

LASER diode
Zener diode
Solar cell
Photo diode

133.

Which of the following logic gate is universal gate ?

134.
If l₁, l₂, l₃ are the lengths of the emitter,base and collector of a transistor, then

l₃ < l₂ < l₁

l₁ = l₂ = l₃

l₃ < l₁ < l₂

l₂ < l₁ < l₃

l₃ < l₁ < l₂

Ebers-Moll equation for transistor parameter.

$I_{E} = I_{pn} (o) + I_{np} (o) a_{11} = Ae (\frac{D_{p} P_{no}}{W} + \frac{D_{n} {nE}_{0}}{L_{E}}) a_{12} = - \frac{{AeD}_{p} P_{no}}{W} = a_{21} a_{22} = Ae (\frac{D_{p} P_{no}}{W} + \frac{D_{n} {nC}_{o}}{L_{c}})$

Here, D_p (D_n) = diffusion constant for hole ( $\bar{e}$ ) m²/sec

W = base width

L_E, L_C, L_B = length of minority carries in E, C and B. Here

L_B < L_E < L_C

l₃ > l₁ > l₂

Collector — is in 1 to 5 mm

Base — is μm

Emiiter — 1 to 2 mm.

135.

When the conductivity of a semiconductor is only due to breaking of covalent bonds, the semiconductor is called

intrinsic
extrinsic
p-type
n-type

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Multiple Choice Questions

134. If l1, l2, l3 are the lengths of the emitter,base and collector of a transistor, then l3 < l2 < l1 l1 = l2 = l3 l3 < l1 < l2 l2 < l1 < l3

134.
If l₁, l₂, l₃ are the lengths of the emitter,base and collector of a transistor, then

l₃ < l₂ < l₁

l₁ = l₂ = l₃

l₃ < l₁ < l₂

l₂ < l₁ < l₃