If the following input signal is sent through a PN-junction diode, then the output signal across ${\mathrm{R}}_{\mathrm{L}}$ will be

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PN junction
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The curve between charge density and distance near P-N junction will be

Concept Questions :-

PN junction
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The resistance of a germanium junction diode whose is shown in figure is $\left({\mathrm{V}}_{\mathrm{k}}=0.3\mathrm{V}\right)$

(a) 5 k$\mathrm{\Omega }$
(b) 0.2 k$\mathrm{\Omega }$
(c) 2.3 k$\mathrm{\Omega }$
(d) $\left(\frac{10}{2.3}\right)\mathrm{k\Omega }$

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PN junction
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In the half-wave rectifier circuit shown. Which one of the following wave forms is true for ${\mathrm{V}}_{\mathrm{CD}}$, the output across C and D?

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Rectifier
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A full-wave rectifier circuit along with the input and output voltages is shown in the figure.

The contribution to the output voltage from diode – 2 is :

(a) A, C                       (b) B, D
(c) B, C                       (d) A, D

Concept Questions :-

Rectifier
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The i-V characteristic of a P-N junction diode is shown below. The approximate dynamic resistance of the P-N junction when a forward bias of 2 volt is applied

(a) 1 $\mathrm{\Omega }$
(b) 0.25 $\mathrm{\Omega }$
(c) 0.5 $\mathrm{\Omega }$
(d) 5 $\mathrm{\Omega }$

Concept Questions :-

PN junction
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The given figure shows the wave forms for two inputs A and B and that for the output Y of a logic circuit. The logic circuit is

(a) An AND gate                   (b) An OR gate
(c) A NAND gate                   (d) An NOT gate

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Logic gates
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The variation of anode current in a triode corresponding to a change in grid potential at three different values of the plate potential is shown in the diagram. The mutual conductance of the triode is

(a) 2.5 m mho      (b) 5.0 m mho
(c) 7.5 m mho      (d) 10.0 m mho

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Transistor
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A silicon speciman is made into a P-type semi-conductor by dopping, on an average, one Indium atom per $5×{10}^{7}$ silicon atoms. If the number density of atoms in the silicon specimen is  then the number of acceptor atoms in silicon per cubic centimetre will be

(a)                    (b)
(c)                    (d)

Concept Questions :-

Types of semiconductors
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The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature

(a) Decreases exponentially with increasing band gap
(b) Increases exponentially with increasing band gap
(c) Decreases with increasing temperature
(d) Is independent of the temperature and the band gap

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Energy band theory
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