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. 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
2. Under which conditions does an initially relaxed system become unstable ?
A. only if bounded input generates unbounded output
B. only if bounded input generates bounded output
C. only if unbounded input generates unbounded output
D. only if unbounded input generates bounded output
3. 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 ?
4. Which one of the following is correct? Energy of a power signal is
A. finite
B. zero
C. infinite
D. Zero to Infinity
5. 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
6. 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
7. Damped sinusoids are _____
A. sinusoid signals multiplied by growing exponentials
B. sinusoid signals divided by growing exponentials
C. sinusoid signals multiplied by decaying exponentials
D. sinusoid signals divided by decaying exponentials
8. 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
9. 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
10. With respect to time, ________is the rate of change
A. Amplitude
B. Time
C. Frequency
D. Voltage
11. Generally, the convolution process associated with the Laplace Transform in time domain results into________
A. Simple multiplication in complex frequency domain
B. Simple division in complex frequency domain
C. Simple multiplication in complex time domain
D. Simple division in complex time domain
12. The ESD of a real valued energy signal is always ________
A. An even (symmetric) function of frequency
B. An odd (non-symmetric) function of frequency
C. A function that is odd and half-wave symmetric
D. None of the above
13. For a ______ channel,the Nyquist bit rate formula defines the theoretical maximum bit rate.
A. noisy
B. noiseless
C. bandpass
D. low-pass rate
14. 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
15. All causal systems must have the component of
A. memory
B. time invariance
C. stability
D. linearity
16. Double integration of a unit step function would lead to
A. an impulse
B. a parabola
C. a ramp
D. a doublet
17. 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
18. A system which is linear is said to obey the rules of
A. homogeneity
B. scaling
C. additivity
D. both scaling and additivity
19. In RLC circuits the state variables generally selected are
A. voltages across capacitors
B. currents through resistances and voltages across capacitors
C. currents through resistances and capacitances
D. currents through inductances and voltages across capacitances
20. 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
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