CHALLENGE OF THE WEEK-3

Date: 21/9/13

For 2^nd years:

1.  A practical DC current source provides 20kW to a 50Ω load and the same power while load is 200Ω. What is the maximum power that can be drawn from the current source?

For 3rd  & 4th years:

In the op-amp circuit shown in the above figure , find the load current i_L?

Last date for submission: 28/9/13

CHALLENGE OF THE WEEK-2 SOLUTION AND WINNERS

SOLUTION:

Consider the first block as shown with output  as 'x'.

Assuming the drop across each diode is considered to be 0.7. 

Case 1:

 A=0, B=0

Both the diodes conduct and hence the voltage at x=0.7 i.e., equivalent to logic '0'.

Case 2:

A=0, B=1 / A=1, B=0 (logic '1' represents +5V)

Only one diode conducts while other is reverse biased. So the voltage at x=0.7 ≈ logic '0'.

Case 3:

A=1, B=1

Both the diodes are reverse biased and hence they act as open connections resulting in voltage as x=5V ≈ logic '1'.

Hence the first block is found to be behaving as an logical AND gate. Therefore x=A^.B.

Similarly considering x and C to be input to next identical connection whose output is y, we find its operation to be  similar as first block i.e., y=x^.C=A^.B^.C.

The last gate in above diagram is a logical NOT gate, hence provides complimentary output, i.e.,

Hence we infer that, the above logic circuit is a 3-input-NAND gate.  

COTW - 2 RESULTS:

NAME                                   SECTION       POINTS

Aneesha J D'Souza               III Sem A        2                                                         

Anushree Shenoy                  III Sem A        2                                                         

Disha Ramesh Shet              III Sem A        2                                                         

Abhilash                                 III Sem A        1                                                                     

Anjana R                                III Sem A        1                                                                     

Deepa S                                 III Sem A        1         

Akshaya S Palan                   III Sem A        1                                                         

Pooja Poojary                        III Sem B         2

Priyanka Shetty                    III Sem B         2

Kshetha Rainal                     III Sem B         1                                                                     

Mefil D'Souza                       III Sem B         1                                                         

Mohith Prabhu M                 III Sem B         1

Pratheek P B                         III Sem B         1

Pallavi Bhatka S                   III Sem B         1                                                                     

Shwetha                                 III Sem C         2

Sukanya Pai                          III Sem C         2

Suraksha  Shetty                  III Sem C         2

Shreshta                                  III Sem C         1

Congratulation Winners

CHALLENGE OF THE WEEK-2

For 2^nd years:

1.

Analyse the circuit shown above and obtain the expression for the output Z in terms of A, B, C.

For 3^rd and 4^th  years:

In the op-amp circuit shown in the above figure , find the load current i_L.

Last date for submission: 19/09/13

CHALLENGE OF THE WEEK-1 SOLUTION AND WINNERS

Winners:

NAME                                                                               Points

Aneesha J D'Souza	III Sem A	1
Anushree Shenoy	III Sem A	1
Disha Ramesh Shet	III Sem A	1
Pooja Poojary	III Sem B	1
Priyanka Shetty	III Sem B	1
Shreshta	III Sem C	1
Shwetha	III Sem C	1
Sukanya Pai	III Sem C	1
Suraksha  Shetty	III Sem C	1

Congratulation Winners

CHALLENGE OF THE WEEK- 1

For the circuit shown above, find v_o: 

a) Given v₁ = 5V and v₂ = 10V.

b) Given v₁ = v₂ = 0V.

Assume the diodes have cut-in voltage of 0.6V.

Last date for submission: 05/09/13

Challenge of the Week – Rules

1.       Open to all students of E&C of all semesters.

2.       Questions will be put up every week.

3.       Complete solution with necessary steps need to be submitted before last date. The solution must be written on a plain sheet of paper with ‘Challenge of the Week’ written on the top.

4.       Mention name, USN, semester and section on the solution sheet.

5.       Correct solution is awarded 1 point. The person who scores maximum points at the end of the academic year is awarded.

6.       For further clarifications, contact the organisers.

7.       Submit solution to :

Jaseem Ahmmed, VII Sem A

Swetha Jose, VII Sem A

Hariprasad, VII Sem A