JFET in a circuit shown in the figure , has IDSS=10mA and Vp=-5v.Value of the resistance IDSS=10mA and Vp=-5v.Value of the resistance RS for a drain current IDS=6.4mA is (select nearest value)

1.  156 ohms

2.  470 ohms

3.  560ohms

4.  1 kilo-ohms

View Answer  
4
Correct Answer :

156 ohms


Explanation :
No Explanation available for this question

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

1.  Increasing the channel doping concentration

2.  Reducing the channel doping concentration

3.  Reducing gate oxide thickness

4.  Reducing the channel length

View Answer  
4
Correct Answer :

Reducing the channel doping concentration


Explanation :
No Explanation available for this question

An n-channel JFET has IDSS=1mA and Vp=-5V. It’s maximum transconductance is

1.  0.1milli mho

2.  0.4 milli mho

3.  1.0 milli mho

4.  4.0 milli mho

View Answer  
4
Correct Answer :

0.4 milli mho


Explanation :
No Explanation available for this question

In a DSB-8C system with 100% modulation, the power saving is

1.  60 %

2.  66 %

3.  76%

4.  100%

View Answer  
4
Correct Answer :

66 \%


Explanation :
No Explanation available for this question

An n channel silicon(Eg=1.1 ev)MOSFET was fabricated using n+poly silicon gate and threshold voltage was found to be 1V.Now, if gate is changed to p+ poly silicon, other things remaining the same, the new threshold voltage should be

1.  -0.1V

2.  0V

3.  1.0V

4.  2.1V

View Answer  
4
Correct Answer :

1.0V


Explanation :
No Explanation available for this question

An FM radio receiver is tuned to a 90.6 MHz broadcast station. It will receive an image frequency of

1.   110MHz

2.  112MHz

3.  114MHz

4.   120MHz

View Answer  
4
Correct Answer :

112MHz


Explanation :
No Explanation available for this question

Two identical FETs, each characterized by the parameters gm and rd are connected in parallel. Then composite FET is characterized by the parameters

1.  gm /2 and 2rd

2.  gm /2 and rd/2

3.  2gm and rd/2

4.  2gm and 2rd

View Answer  
4
Correct Answer :

2gm and rd/2


Explanation :
No Explanation available for this question

A FM signal is being broadcast in the 88.108MHz band having a carrier swing of 125 kHz. The modulation index is

1.  100%

2.  83%

3.  67%

4.  50%

View Answer  
4
Correct Answer :

83\%


Explanation :
No Explanation available for this question

An FM voltage signal s(t), with a carrier frequency of 1.15GHz has a complex envelope g(t)=AC[1+m(t)], where AC=500V and modulation is a 1kHz sinusoidal test tone described by m(t)=08 sin(2πx103t). appears acr0ss a 50Ω resistive load. What is the actual power dissipated in the load

1.  165W

2.  82.5kW

3.  3.3kW

4.  6.6kW

View Answer  
4
Correct Answer :

165W


Explanation :
No Explanation available for this question

Pre-emphasis in FM systems involves

1.  compression of the modulating signal

2.  expansion of the modulating signal

3.  amplifier of lower frequency components

4.  amplification of higher frequency components of the modulating signal

View Answer  
4
Correct Answer :

amplification of higher frequency components of the modulating signal


Explanation :
No Explanation available for this question
Previous Next

Interview Questions

MongoDB
Java Script
Node JS
PHP
JQuery
Python