Useful Signals MCQs : This section focuses on the "Useful Signals". These Multiple Choice Questions (MCQs) should be practiced to improve the Useful Signals skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Compute d[n]d[n-1] + d[n-1]d[n-2] for n = 0, 1, 2.
A. 2000, 1, 2
B. 0, 0, 1
C. 1, 0, 0
D. 0, 0, 0
Question 2
Defining u(t), r(t) and s(t) in their standard ways, are their derivatives defined at t = 0?
A. Yes, Yes, No
B. No, Yes, No
C. No, No, Yes
D. No, No, No
Question 3
Evaluate the following function in terms of t: {integral from 0 to t}{Integral from -inf to inf}d(t)
A. 1⁄t
B. 1⁄t2
C. t
D. t2
Question 4
Evaluate the following function in terms of t: {sum from -1 to infinity:d[n]}/{Integral from 0 to t: u(t)}
A. t
B. 1⁄t
C. t2
D. 1⁄t2
Question 5
Find the magnitude of exp(jwt). Find the boundness of sin(t) and cos(t).
A. 1, [-1,2], [-1,2]
B. 0.5, [-1,1], [-1,1]
C. 1, [-1,1], [-1,2]
D. 1, [-1,1], [-1,1]
Question 6
Find the value of {sum from -inf to inf} exp(jwn)*d[n].
A. 0
B. 1
C. 2
D. 3
Question 7
The fundamental period of exp(jwt) is
A. pi/w
B. 2pi/w
C. 3pi/w
D. 4pi/w
Question 8
Unit Impulse function is obtained by using the limiting process on which among the following functions?
A. Triangular Function
B. Rectangular Function
C. Signum Function
D. Sinc Function
Question 9
The range for unit step function for u(t – a), is ________
A. t < a
B. t ≤ a
C. t = a
D. t ≥ a
Question 10
What is the value of d[0], such that d[n] is the unit impulse function?
A. 0
B. 0.5
C. 1.5
D. 1
Question 11
What is the value of u[1], where u[n] is the unit step function?
A. 1
B. 0.5
C. 0
D. -1
Question 12
When is a complex exponential signal pure DC?
A. σ = 0 and Ω < 0
B. σ < 0 and Ω = 0
C. σ = 0 and Ω = 0
D. σ < 0 and Ω < 0
Question 13
Which is the correct Euler expression?
A. exp(2jt) = cos(2t) + jsin(t)
B. exp(2jt) = cos(2t) + jsin(2t)
C. exp(2jt) = cos(2t) + sin(t)
D. exp(2jt) = jcos(2t) + jsin(t)
Question 14
Which one of the following is not a ramp function?
A. r(t) = t when t ≥ 0
B. r(t) = 0 when t < 0
C. r(t) = ∫u(t)dt when t < 0
D. r(t) = du(t)⁄dt