BASICS OF ELECTRONICS ENGINEERING EC100 QUESTION PAPER WITH ANSWERS FOR S1-S2 KTU STUDENTS [FIRST YEAR] Part - |


BASICS OF ELECTRONICS ENGINEERING QUESTION PAPER WITH ANSWERS

Basics of Electronics Engineering EC100 question papers,Basics of Electronics Engineering EC100 questions and answers,Basics of Electronics Engineering EC100 solved answers,electronics engineering questions and answers,ktu btech electronics engineering questions and answers,electronics engineering question papers,electronics engineering,basic electronics engineering questions,bee questions,BASICS OF ELECTRONICS ENGINEERING EC100  QUESTION PAPER WITH ANSWERS FOR S1-S2 KTU STUDENTS [FIRST YEAR] Part - |

PART A


1. Differentiate relays and contactors and write the applications of each.

RelayContactor


  • Relatively smaller in size.


  • Larger when compared to relays.


  • Used in circuits with lower ampacity. (Max 20A)



  • Used in circuits with low and higher ampacity up to 12500A.


  • Mainly used in control and automation circuits, protection circuits and for switching small electronic circuits


  • Used in the switching of motors, Capacitors,lights etc.


  • Consists of at least two NO/NC contacts.


  • Consists of minimum one set of three phase power contacts and in some cases additional auxiliary contacts are also provided.


2. What is tolerance of a resistor? Find the resistance range for the carbon resistor having the colour bands: yellow, violet, red and gold.

Tolerance is the percentage of error in the resistor's resistance, or how much more or less
you can expect a resistor's actual measured resistance to be from its stated resistance. A
gold tolerance band is 5% tolerance, silver is 10%, and no band at all would mean a 20%
tolerance.
Resistance range of the given color band is 4.7K  5%.

3. Write any four applications of electronics in the field of defense.
  • Electronic circuits provide a means of secret communication between the headquarter and different units.
  • RADAR that is Radio Detection and Ranging is the most important development inelectronics field. With the help of radar, it is possible to detect and find the exact location of enemy aircraft, Radar and anti-craft guns can be linked by an automatic control system to make a complete unit.
  • Circuit Boards and sub-assemblies for military firing simulators (anti-tank)
  • Electrical distribution circuit boards for military helicopters.

4. Draw the energy band diagrams of insulator, semiconductor and conductor.

Basics of Electronics Engineering EC100 question papers,Basics of Electronics Engineering EC100 questions and answers,Basics of Electronics Engineering EC100 solved answers,electronics engineering questions and answers,ktu btech electronics engineering questions and answers,electronics engineering question papers,electronics engineering,basic electronics engineering questions,bee questions,BASICS OF ELECTRONICS ENGINEERING EC100  QUESTION PAPER WITH ANSWERS FOR S1-S2 KTU STUDENTS [FIRST YEAR] Part - |


5. How does an Avalanche breakdown differ from Zener break down?



A.



Zener break down
Avalanche breakdown
1.This occurs at junctions, which being
heavily doped have narrow depletion
layers.
1. This occurs at junctions which being
lightly doped has wide depletion layers.
2. This breakdown voltage sets a very
strong electric field across this narrow
layer.
2. Here, electric field is not strong
enough to produce Zener breakdown.
3. Here, electric field is very strong to
rupture the covalent bonds thereby
generating electron hole pairs. So even
a small increase in reverse voltage is
capable of producing large number of
current carriers, i.e. why the junction
has a very low resistance. This leads to
Zener breakdown
3. Here, minority carriers collide with
semiconductor atoms in the depletion
region, which breaks the covalent
bonds and electron-hole pairs are
generated. Newly generated charge
carriers are accelerated by the electric
field, which results in more collision
and generates avalanche of charge
carriers. This results in avalanche
breakdown.
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