A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. Which of the following is/are not a property/properties power spectral density function Sx(?)?
A. Sx(?) is real function of ?
B. Sx(?) is a even function of ?
C. Sx(?) is a odd function of ?
D. Sx(?) is non-positive function of ?Sx(?) ? 0 for all ?
2. The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal
A. frequency
B. period
C. bandwidth
D. amplitude
3. Where does the maximum value of auto-correlation function of a power signal occur?
A. At origin
B. At extremities
C. At unity
D. At infinity
4. Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform?
A. Triangular
B. Trapezoidal
C. Rectangular
D. Semi-circular
5. In a complex wave, the negative half of the wave is a reproduction of the positive half wave. Then
A. the wave does not contain triple harmonics
B. the wave does not contain odd harmonics
C. the wave does not contain even harmonics
D. the wave contains only fundamental and third harmonic
6. The integral of k u(t) is
A. 1/k ?(t)
B. k ?(t)
C. a ramp of slope 1/k
D. a ramp of slope k
7. For Ergodic Process
A. ensemble Average equal to time Average
B. ensemble Average is not equal to time Average
C. ensemble Average > Time Average
D. ensemble Average < Time Average
8. What does the spectral density function of any signal specify?
A. Distribution of energy or power
B. Consumption of energy or power
C. Conservation of energy or power
D. Generation of energy or power
9. The Fourier series of an odd periodic function contains
A. odd harmonics only
B. even harmonics only
C. cosine harmonics only
D. sine harmonics only
10. According to the time-shifting property of Laplace Transform, shifting the signal in time domain corresponds to the ______
A. Multiplication by e-st0 in the time domain
B. Multiplication by e-st0 in the frequency domain
C. Multiplication by est0 in the time domain
D. Multiplication by est0 in the frequency domain
11. A system which is linear is said to obey the rules of
A. homogeneity
B. scaling
C. additivity
D. both scaling and additivity
12. Which result is generated/ obtained by the addition of a step to a ramp function ?
A. Step function of zero slope
B. Ramp function of zero slope
C. Ramp Function shifted by an amount equal to step
D. Step Function shifted by an amount equal to ramp
13. Baseband transmission of a digital signal is possible only if we have a ____ channel.
A. low-pass
B. bandpass
C. low rate
D. high rate
14. Which among the following belongs to the category of non-recursive systems?
A. Non-causal IIR Systems
B. Causal IIR Systems
C. Non-causal FIR Systems
D. Causal FIR Systems
15. The tree selected for the formation of state equations contains
A. all voltage sources
B. all capacitors
C. all inductors and current sources
D. all voltage sources and maximum number of capacitors
16. What is the value of an area under the conditional PDF ?
A. Greater than 0 but less than 1
B. Greater than 1
C. Equal to 1
D. Infinite
17. If f(t) is an even function, the coefficients Fn in the exponential form of Fourier series
A. are real
B. are imaginary
C. are complex
D. may be real or imaginary
18. What is the nature of Fourier representation of a discrete & aperiodic signal?
A. Continuous & periodic
B. Discrete and aperiodic
C. Continuous & aperiodic
D. Discrete & periodic
19. What would happen if the value of term [(m-x) / (? ? 2)] increases in the expression of Guassian CDF?
A. Complementary error function also goes on increasing
B. Complementary error function goes on decreasing
C. Complementary error function remains constant or unchanged
D. Cannot predict
20. With respect to time, ________is the rate of change
A. Amplitude
B. Time
C. Frequency
D. Voltage
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