GATE ECE 1992 | GATE ECE Year Wise Previous Years Questions

GATE ECE 1992

MCQ (Single Correct Answer)

-0.6

A linear discrete - time system has the characteristic equation, $${z^3} - 0.81\,\,z = 0.$$ The system

is stable.

is marginally stable.

is unstable.

stability cannot be assessed from the given information.

GATE ECE 1992

MCQ (More than One Correct Answer)

-0.6

Which of the following signals is/are periodic?

S (t) = cos2t + cos3t + cos5t

S (t) = exp ( j8$$\pi$$t )

S (t) = exp (−7t ) sin10$$\pi$$t

S (t) = cos2t cos 4t

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