MCQOPTIONS
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MCQOPTIONS
This section includes 76 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
A signal is a physical quantity which does not vary with |
| A. | time |
| B. | space |
| C. | independent variables |
| D. | dependent variables |
| Answer» E. | |
| 52. |
Determine the nature of the signal: x(t) = e-0.2t [cosΩt + jsinΩt]. |
| A. | exponentially decaying sinusoidal signal |
| B. | exponentially growing sinusoidal signal |
| C. | sinusoidal signal |
| D. | exponential signal |
| Answer» B. exponentially growing sinusoidal signal | |
| 53. |
An exponentially growing sinusoidal signal is: |
| A. | σ = 0 and Ω = 0 |
| B. | σ > 0 and Ω ≠0 |
| C. | σ < 0 and Ω ≠0 |
| D. | σ = 0 and Ω ≠0 |
| Answer» C. σ < 0 and Ω ≠0 | |
| 54. |
When is a complex exponential signal sinusoidal? |
| A. | σ =0 and Ω = 0 |
| B. | σ < 0 and Ω = 0 |
| C. | σ = 0 and Ω ≠0 |
| D. | σ ≠0 and Ω ≠0 |
| Answer» D. σ ≠0 and Ω ≠0 | |
| 55. |
A complex exponential signal is a decaying exponential signal when |
| A. | Ω = 0 and σ > 0 |
| B. | Ω = 0 and σ = 0 |
| C. | Ω ≠0 and σ < 0 |
| D. | Ω = 0 and σ < 0 |
| Answer» E. | |
| 56. |
The most general form of complex exponential function is: |
| A. | eσt |
| B. | eΩt |
| C. | est |
| D. | eat |
| Answer» D. eat | |
| 57. |
exp[jwn] is periodic |
| A. | for any w |
| B. | for any t |
| C. | for w=2pi*m/n |
| D. | for t = 1/w |
| Answer» D. for t = 1/w | |
| 58. |
Define the fundamental period of the following signal x[n] = exp(2pi*j*n/3) + exp(3*pi*j*n/4)? |
| A. | 8 |
| B. | 12 |
| C. | 18 |
| D. | 24 |
| Answer» E. | |
| 59. |
exp(jwt) is periodic |
| A. | for any w |
| B. | for any t |
| C. | for no w |
| D. | for no t |
| Answer» B. for any t | |
| 60. |
What is the period of exp(2+pi*j/4)t? |
| A. | 4 |
| B. | 8 |
| C. | 16 |
| D. | 20 |
| Answer» C. 16 | |
| 61. |
Sinusoidal signals multiplied by decaying exponentials are referred to as |
| A. | amplified sinusoids |
| B. | neutralized sinusoids |
| C. | buffered sinusoids |
| D. | damped sinusoids |
| Answer» E. | |
| 62. |
Total energy possessed by a signal exp(jwt) is? |
| A. | 2pi/w |
| B. | pi/w |
| C. | pi/2w |
| D. | 2pi/3w |
| Answer» B. pi/w | |
| 63. |
What is the fundamental frequency of exp(2pi*w*j)? |
| A. | 1pi*w |
| B. | 2pi*w |
| C. | w |
| D. | 2w |
| Answer» D. 2w | |
| 64. |
What is the magnitude of exp(2+3j)? |
| A. | exp(2.3) |
| B. | exp(3) |
| C. | exp(2) |
| D. | exp(3/2) |
| Answer» D. exp(3/2) | |
| 65. |
What is exp(ja) equal to, where j is the square root of unity? |
| A. | cos ja + jsin a |
| B. | sin a + jcos a |
| C. | cos j + a sin j |
| D. | cos a + jsin a |
| Answer» E. | |
| 66. |
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 |
| Answer» C. signum function | |
| 67. |
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 |
| Answer» D. σ < 0 and Ω < 0 | |
| 68. |
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)â„dt |
| Answer» E. | |
| 69. |
The range for unit step function for u(t – a), is |
| A. | t < a |
| B. | t ≤ a |
| C. | t = a |
| D. | t ≥ a |
| Answer» E. | |
| 70. |
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) |
| Answer» C. exp(2jt) = cos(2t) + sin(t) | |
| 71. |
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 |
| Answer» E. | |
| 72. |
Find the value of {sum from -inf to inf} exp(jwn)*d[n]. |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 73. |
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] |
| Answer» E. | |
| 74. |
The fundamental period of exp(jwt) is |
| A. | pi/w |
| B. | 2pi/w |
| C. | 3pi/w |
| D. | 4pi/w |
| Answer» C. 3pi/w | |
| 75. |
Compute d[n]d[n-1] + d[n-1]d[n-2] for n = 0, 1, 2. |
| A. | 0, 1, 2 |
| B. | 0, 0, 1 |
| C. | 1, 0, 0 |
| D. | 0, 0, 0 |
| Answer» E. | |
| 76. |
Evaluate the following function in terms of t: {integral from 0 to t}{Integral from -inf to inf}d(t) |
| A. | 1â„t |
| B. | 1â„t2 |
| C. | t |
| D. | t2 |
| Answer» D. t2 | |