The threshold voltage of an n-channel MOSFET can be increased by

1.  Increasing channel doping concentration

2.  Reducing channel length

3.  Reducing gate oxide thickness

4.  Decreasing channel doping concentration.

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4
Correct Answer :

Reducing channel length


Explanation :
No Explanation available for this question

Three different circuits for biasing junction transistor amplifiers are given below The correct decreasing order of preference of these circuits from the point of view bias stabilization is

1.  i, ii, iii

2.  iii, ii, i

3.  ii, iii, i

4.  i, iii, ii.

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4
Correct Answer :

ii, iii, i


Explanation :
No Explanation available for this question

The MOSFET switch in its on-state may be considered equivalent to

1.  Resistor

2.  Inductor

3.  Capacitor

4.  Battery.

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4
Correct Answer :

Capacitor


Explanation :
No Explanation available for this question

In the transistor circuit shown in the figure, collector-to-ground voltage is +20 V. which of the following is the probable error

1.  Collector-emitter terminals shorted

2.  Emitter to ground connection open

3.  10 K resistor open

4.  Collector –base terminal shorted.

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4
Correct Answer :

Emitter to ground connection open


Explanation :
No Explanation available for this question

The center tap full-wave single –phase rectifier circuit uses 2 diodes as shown in the given figure. The rms voltage across each diode is

1.  790.7 V

2.  395.3 V

3.  280 V

4.  201.3 V.

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4
Correct Answer :

395.3 V


Explanation :
No Explanation available for this question

In the circuit shown in the given figure, transistor is in active mode. VBE=0.7 volt. The approximation without knowing hfe for Vc as shown in the figure is

1.  1.0 V

2.  3.3 V

3.  4.3 V

4.  4.7 V

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4
Correct Answer :

4.3 V


Explanation :
No Explanation available for this question

A voltage source VAB=4 sin t is applied to the terminals A and B of the circuit shown in the given figure. The diodes are assumed to be identical. The impendence by the circuit across the terminal A and B is

1.  5 K

2.  10 K?

3.  15 K?

4.  20 K?

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4
Correct Answer :

10 K?


Explanation :
No Explanation available for this question

If α= 0.98, ICO=6 A and Iβ=100 A for transistor, then value of IC will be

1.  2.3 mA

2.  3.1 mA

3.  4.6 mA

4.  5.2 mA.

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4
Correct Answer :

5.2 mA.


Explanation :
No Explanation available for this question

For the given input, output waveform across the diode shown in the figure will be

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

The base-biased transistor circuit of figure is subjected to increase in junction temperature from 250C to 750c. if β increases from 100 to 150 with rising temperature, percentage change in a-point value (IC, VCE) over the temperature range will be (assume VBE reacts at 0.7 V)

1.  -40 %

2.  -44.57 %

3.  -46.57 %

4.  -48.0 %.

View Answer  
4
Correct Answer :

-44.57 \%


Explanation :
No Explanation available for this question
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