Test: Discrete-Time Systems


15 Questions MCQ Test RRB JE for Electrical Engineering | Test: Discrete-Time Systems


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Attempt Test: Discrete-Time Systems | 15 questions in 45 minutes | Mock test for Railways preparation | Free important questions MCQ to study RRB JE for Electrical Engineering for Railways Exam | Download free PDF with solutions
QUESTION: 1

x[n] and h[n] are given in the question. Compute the convolution y[n] = x[n] * h[n] and choose correct option.

Que: 

Solution:

QUESTION: 2

x[n] and h[n] are given in the question. Compute the convolution y[n] = x[n] * h[n] and choose correct option.

Que: 

Solution:

QUESTION: 3

x[n] and h[n] are given in the question. Compute the convolution y[n] = x[n] * h[n] and choose correct option.

Solution:

QUESTION: 4

In question y[n] is the convolution of two signal. Choose correct option for y[n].

Solution:

QUESTION: 5

In question y[n] is the convolution of two signal. Choose correct option for y[n].

Solution:

QUESTION: 6

In question y[n] is the convolution of two signal. Choose correct option for y[n].

Solution:

QUESTION: 7

In question y[n] is the convolution of two signal. Choose correct option for y[n].

y[n] = u[n + 3] * u[n - 3]

Solution:

QUESTION: 8

The convolution of x[n] = cos ( π/2 n) u[n] and h[n] = u[n - 1] is f [n]u[n - 1]. The function f [n] is

Solution:

QUESTION: 9

Let P be linearity, Q be time invariance, R be causality and S be stability. In question discrete time input x[n] and output y[n] relationship has been given. In the option properties of system has been given. Choose the option which match the properties for system.

Que: y[n] = rect (x[n])

Solution:

At any discrete time n = no , the response depends only on the excitation at that discrete time. (Causal)

No matter what values the excitation may have the response can only have the values zero or one.

QUESTION: 10

Let P be linearity, Q be time invariance, R be causality and S be stability. In question discrete time input x[n] and output y[n] relationship has been given. In the option properties of system has been given. Choose the option which match the properties for system.

y[n] = nx[n]

Solution:

Since the system is homogeneous and additive, it is also linear.

At any discrete time, n = no the response depends only on the excitation at that same time. (Causal)

If the excitation is a constant, the response is unbounded as n approaches infinity. (Unstable)

QUESTION: 11

Let P be linearity, Q be time invariance, R be causality and S be stability. In question discrete time input x[n] and output y[n] relationship has been given. In the option properties of system has been given. Choose the option which match the properties for system.

Solution:

Since the system is homogeneous and additive it is also linear

At any discrete time, n =no , the response depends on the excitation at the next discrete time in future. (Anti causal)

If the excitation is a constant, the response increases without bound (Unstable)

QUESTION: 12

Let P be linearity, Q be time invariance, R be causality and S be stability. In question discrete time input x[n] and output y[n] relationship has been given. In the option properties of system has been given. Choose the option which match the properties for system.

Solution:

At any discrete time n = no , the response depends only on the excitation at that time (Causal)

If the excitation is bounded, the response is bounded. (Stable).

QUESTION: 13

The output signal when a signal x(n)=(0,1,2,3) is processed through an ‘Delay’ system is:

Solution:

An delay system is a system whose output is same as the input, but after a delay.

QUESTION: 14

x[n] as shown in fig.

Solution:

At any discrete time, n = n0 the response depends only on the excitation at that discrete time and not on any future excitation. (Causal)

If the excitation is bounded, the response is bounded. (Stable).

QUESTION: 15

x[n] as shown in fig

Solution:

At any discrete time n no the response depends only on the excitation at that discrete time and previous discrete time. (Causal)

If the excitation is constant, the response increase without bound. (Unstable)

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