Recent content by tina_singh

  1. T

    Calculating time period of cos(pi/8 n*n)

    actually what really confuses me is the term n square..i have solved similar questions where cos was a function of n(t in continuous time). please help me with this question.. i will be really greatful
  2. T

    Calculating time period of cos(pi/8 n*n)

    can some one please help me calculate the time period of the signal cos(pi/8 n*n).
  3. T

    Periodicty - Sampling of a periodic signal

    periodicty -- Sampling of a periodic signal... I have a doubt..is a signal which is sampled from a periodic signal also periodic?if so then is there a relation beyween the time period of the two?
  4. T

    Relation between open loop and unity feedback close loop response

    these are the two response.. can some one please help now... than in advance
  5. T

    Relation between open loop and unity feedback close loop response

    hi! can someone please help me with this problem...i have to match the open loop respone to the close loop unity feedback system of a control system. what is the relation between the two? thanx in advance
  6. T

    Undergrad The Mystery of the Mass of a Vacancy

    a hole is the absence of electron..so basically its just a vacancy.. so why does it have a mass??..how can a vacancy have a mass and dat too greater than electron itself??..can any1 pleasez help..
  7. T

    How Do Stability and Linearity Determine System Behavior?

    confused!..system stability and linearity 1)-Is y(n)=cos{x(n)} a stable system?? and is the condition s=Ʃ|h(k)|<∞ for stability valid only for LTI systems? actually my book solves the given problem using the above method..but according to me the given system is not LTI SINCE ZERO I/P...
  8. T

    Undergrad Why does capacitor work on battery

    a capacitor does not work on dc as time varying current is required for it to function then why does it work on dc battery?
  9. T

    Why do signals shift in opposite directions when time shifted in opposite ways?

    when we have x(-t) and we time shift it say x(-t-2) it shifts toward the -ve t axis.. where as x(t-2) the function is shifted on the + axis..why is it so?? see when we say there are 2 functions x(t) and x(t-2) it means x(t-2) is delayed by 2 sec with respect to x(t) therefore it shifts in the...
  10. T

    Undergrad Understanding Even & Odd Functions: Questions Answered

    okh..thanks for answering..i got the first 2 parts... buh i m still a little confuse about the third...see when we say there are 2 functions x(t) and x(t-2) it means x(t-2) is delayed by 2 sec with respect to x(t) therefore it shifts in the positive x direction.. does'n't the same apply for...
  11. T

    Electromotive Force: Is It Really a Force?

    okh...i seem to have got the point.. thank you for sharing your opinion and coming up wid such analytical answers.. i m really grateful to ol dose who bothered to reply!1
  12. T

    Electromotive Force: Is It Really a Force?

    electromotive force... why is v called electromotive force if it is not a force?? is there a reason for this??
  13. T

    Undergrad Understanding Even & Odd Functions: Questions Answered

    1)-why is x(t)+x(-t) always even??..no matter if x(t) even or odd? 2)-when we talk about unit step function...u(t)..and we add..u(t)+u(-t)..the value of both is 1 at t=0..so does'n't that gets added twice??..and it becomes 2 at t=0... 3)when we have x(-t) and we time shift it say x(-t-3)...
  14. T

    Why is x(t) + x(-t) always even regardless of x(t)'s nature?

    1)-why is x(t)+x(-t) always even??..no matter if x(t) even or odd? 2)-when we talk about unit step function...u(t)..and we add..u(t)+u(-t)..the value of both is 1 at t=0..so does'n't that gets added twice??..and it becomes 2 at t=0... 3)when we have x(-t) and we time shift it say x(-t-3)...