Test Your Knowledge - Free MCQ PRACTICE
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DRIVINGTEST
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. According to Rayleigh’s theorem, it becomes possible to determine the energy of a signal by________
A. Estimating the area under the square root of its amplitude spectrum
B. Estimating the area under the square of its amplitude spectrum
C. Estimating the area under the one-fourth power of its amplitude spectrum
D. Estimating the area exactly half as that of its amplitude spectrum

2. Where is the ROC defined or specified for the signals containing causal as well as anti-causal terms?
A. Greater than the largest pole
B. Less than the smallest pole
C. Between two poles
D. Cannot be defined

3. For a second order system, damping ratio ? is such that 0 < ? <. Then the roots of characteristic equation are
A. real but not equal
B. imaginary
C. complex conjugate
D. real and equal

4. A system is said to be defined as non causal, when
A. the output at the present depends on the input at an earlier time
B. the output at the present does not depend on the factor of time at all
C. the output at the present depends on the input at the current time
D. the output at the present depends on the input at a time instant in the future

5. The discrete time system describes by y(n) = x(n)is
A. non-casual, non-linear, time variant
B. non-casual, Linear, time invariant
C. casual, non-linear, timevari
D. casual, Linear, time varying

6. 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

7. The theoretical power of white noise is
A. infninite
B. depend upon frequency of signal
C. finite
D. zero

8. 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

9. Double integration of a unit step function would lead to
A. an impulse
B. a parabola
C. a ramp
D. a doublet

10. 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

11. Auto correlation function
A. is an even function of t
B. is an odd function of t
C. may be an even or odd function of t
D. is both an odd and even function of t

12. For a ______ channel,the Nyquist bit rate formula defines the theoretical maximum bit rate.
A. noisy
B. noiseless
C. bandpass
D. low-pass rate

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. 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

15. The inverse Laplace transform of 1/(s – a)2 is
A. eat
B. t eat
C. t2 eat
D. eat/t

16. 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

17. 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

18. The signal defined by the equations f(t) = 0 for t < 0, f(t) = E for 0 ? t ? a and f(t) = 0 for t > a is
A. a step function
B. a pulse function
C. a shifted step function originating at t = a
D. unit step function

19. 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

20. Duality Theorem / Property of Fourier Transform states that _________
A. Shape of signal in time domain & shape of spectrum can be interchangeable
B. Shape of signal in frequency domain & shape of spectrum can be interchangeable
C. Shape of signal in time domain & shape of spectrum can never be interchangeable
D. Shape of signal in time domain & shape of spectrum can never be interchangeable

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