A silicon pn junction with doping profile of Na=1016cm-3 and Nd=1015cm-3 has a sectional area of 10-2cm2.If length of the p region is 2mm and length of the n-region is 1mm,then approximately series resistance of the diode is

1.  62 Ω

2.  43 Ω

3.  72 Ω

4.  81 Ω

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4
Correct Answer :

72 Ω


Explanation :
No Explanation available for this question

The figure given below shows the transfer characterstics of

1.  Peak clipper

2.  Bottom clipper

3.  Clamper

4.   Two level clipper

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4
Correct Answer :

Peak clipper


Explanation :
No Explanation available for this question

A uniformely doped silicon pn junction has dopant profile of Na=Nd=5*1016cm-3. If peak electric field in the junction at breakdown is E=4*105V/cm, then breakdown voltage of this junction is

1.  35V

2.  30V

3.  25V

4.  20V

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4
Correct Answer :

20V


Explanation :
No Explanation available for this question

An abrupt silicon p*n junction has an n-region doping concentration of Nd=5*1016cm-3.The minimum n-region width, such that avalanche breakdown occurs before the depletion region reaches an ohmic contact is (VB≈100V)

1.  5.1μm

2.  3.6μm

3.  7.3μm

4.  6.4μm

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4
Correct Answer :

5.1μm


Explanation :
No Explanation available for this question

The figure shown below is a circuit of

1.  Bridge rectifier

2.  Voltage doubler

3.  Rectifier with filter

4.   Comparator

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4
Correct Answer :

Voltage doubler


Explanation :
No Explanation available for this question

A silicon pn junction diode has doping profile Na=Nd=5*1019cm-3.The space charge width at a forward bias voltage of Va=0.4V is

1.  102A0

2.  44A0

3.  153A0

4.  6A0

5.  BJT

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5
Correct Answer :

6A0


Explanation :
No Explanation available for this question

An amplifier has gain A=100 , upper cut-off frequency of 100kHz and lower cut off frequency of 1 kHz. A negative feedback of β=01 is added. Wichone of the following is not correct

1.  Gain becomes 100/11

2.  Lower cut off frequency becomes(1000/11) Hz

3.  Upper cut off frequency becomes 1.1MHz

4.   dB of feedback is 20log1011

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4
Correct Answer :

dB of feedback is 20log1011


Explanation :
No Explanation available for this question

Consider the following four common type of transistor Poin contact transistor Bipolar junction transistor Mos field effect transistor Junction field effect transistor Corrct arrangement of these transistors in the increasing order of input impedence is

1.  1,2,4,3

2.  1,2,3,4

3.  2,1,3,4

4.  2,1,4,3

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4
Correct Answer :

2,1,4,3


Explanation :
No Explanation available for this question

For the amplifier shown in the figure given below, the lower cut-off frequency depends on

1.  Cs, CE, internal junction capacitances of transistor

2.  Strong wiring capacitance(CW), CC

3.  Cs, CE, Cc

4.   Cs, CE only

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4
Correct Answer :

Cs, CE, Cc


Explanation :
No Explanation available for this question

A junction transistor operating at room temperature with Ic=2mA, where kT/q=25mV has β=100. The values of parameters gm in mhos and rx in ohms will be respectively

1.  0.04 and 2500

2.  0.08 and 1250

3.  0.5 and 1800

4.  0.08 and 15000

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4
Correct Answer :

0.08 and 1250


Explanation :
No Explanation available for this question
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