Signals and Systems - ECE Questions and Answers

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

For the discrete time system of the given figure

y_k = 0.5 u_{k - 2} - u_k - 0.25 y_k - 1

y_k = 0.5 u_k_{- 1} - u_k - 0.25 y_k - 1

y_k = 0.5 u_k - u_k_{- 1} - 0.25 y_k - 1

y_k = 0.5 u_k_{- 1} - u_k_{- 1} - 0.25 y_k - 1

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

The signal is

periodic for t > 0

non-periodic

periodic for t < 0

depends on t

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

In the state equation x = AX + Bu is a n x m matrix.

True

False

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

If the poles of H(z) are at

z = 1 and z = 3

z = -1 and z = -3

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

Which one is a non-causal system?

y(n) = x(2n)

y(n) = x(n/2)

y(n) = x(n/2) + x(n)

all

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

A linear system is characterized by H(ω) = Be^-2ω² the system is physically

unrealizable

realizable

depends upon B

depends upon constant 2

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

The current in a circuit with 10 Ω resistance is i = 3 + 4 sin (100 t + 45°) + 4 sin (300 t + 60°) A. The rms current and power dissipated are

41 A and 410 W

35 A and 350 W

5 A and 250 W

11 A and 1210 W

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

Fourier transform pair are

autocorrelation and power spectral density

autocorrelation and convoloution

convolution and power spectral density

autocorrelation and energy

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

The function x(t) is shown in the given figure. Even and odd parts of a unit step function ∪ (t) are respectively,