An ideal p-channel MOSFET has the following parameters W=15μm,μp=300cm2/V-S L=1.5 μm,t0x=350A0, and VτP=-0.8V  If transistors is operating in non saturation region at VSD-0.5V, then value of gm is

1.  28.6ms

2.  286ms

3.  148ms

4.  0.148ms

View Answer  
4
Correct Answer :

0.148ms


Explanation :
No Explanation available for this question

An deal n-channel MOSFET has the following parameters W=30μm,μn=450cm2/V-s,L=2μm,t0x=350A0, V τN=-0.8V If transistor is operating in saturation at VGS=4V, then value of gm is

1.  486μs

2.  0.213ms

3.  2.13ms

4.  48.6ms

View Answer  
4
Correct Answer :

2.13ms


Explanation :
No Explanation available for this question

In a transistor having finite, the forward bias across the base emitter junction is kept constant and the reverse bias across the collector base junction is increased. Neglecting the leakage across the collector base junction and depletion region generation current, the base current will

1.  Increase

2.  Decrease

3.  Remain constant

4.  None of these

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4
Correct Answer :

Decrease


Explanation :
No Explanation available for this question

Threshold voltage of an channel MOSFET can be increased by

1.  Increasing the channel doping concentration

2.  Reducing the channel doping concentration

3.  Reducing the channel length

View Answer  
3
Correct Answer :

Reducing the channel doping concentration


Explanation :
No Explanation available for this question

The transit time of the current carries through the channel of an FET decides its

1.  Switching

2.  On/off

3.  Dynamic

4.  Load

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4
Correct Answer :

Switching


Explanation :
No Explanation available for this question

In the transistor circuit shown in figure below, collector to ground voltage is +20v. Which of the following is the probable cause of error

1.  Collector –emitter terminals shorted

2.  Emitter to ground connection open

3.  10 ohms resistor open

4.  Collector base terminals shorted

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4
Correct Answer :

Emitter to ground connection open


Explanation :
No Explanation available for this question

A switched mode power supply operating at 20 kHz to 100 kHz range use as the main switching element is

1.  Thyristor

2.  MOSFET

3.  Triac

4.  UJT

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4
Correct Answer :

MOSFET


Explanation :
No Explanation available for this question

A change in the value of the emitter resistance Re, in a difference amplifier

1.  Affects the difference mode gain, Ad

2.  Affects the common mode gain, Ac

3.  Affects both Ad and Ac

4.  Does not affect either Ad and Ac

View Answer  
4
Correct Answer :

Affects the common mode gain, Ac


Explanation :
No Explanation available for this question

If a transistor is operating with both of its junctions forward biased, but with collector base forward bias greater than the emitter base forward bias, then its operating in the

1.  Forward active mode

2.  Reverse saturation mode

3.  Reverse active mode   

4.  Forward saturation saturation mode

View Answer  
4
Correct Answer :

Reverse saturation mode


Explanation :
No Explanation available for this question

The common emitter short circuit current gain of a transistor

1.  Is a monotonically increasing of the collector current Ic

2.  Is a monotonically decreasing function Ic

3.  Increases with Ic for low Ic, reaches a maximum, and the decreases in Ic

4.  Is not a function of Ic

View Answer  
4
Correct Answer :

Increases with Ic for low Ic, reaches a maximum, and the decreases in Ic


Explanation :
No Explanation available for this question
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