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. With respect to time, ________is the rate of change
A. Amplitude
B. Time
C. Frequency
D. Voltage
2. A sine wave in the ______ domain can be represented by one single spike in the _____ domain.
A. time; frequency
B. frequency; time
C. time; phase
D. phase; time
3. 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
4. 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
5. Which one of the following is correct? Energy of a power signal is
A. finite
B. zero
C. infinite
D. Zero to Infinity
6. 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
7. 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
8. 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
9. A time invariant system is a system whose output
A. vanishes with a delay in input
B. remains same with a delay in input
C. decreases with a delay in input
D. increases with a delay in input
10. 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
11. As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes
A. division by s in the s domain
B. division by e-sT in the s domain
C. multiplication by s in the s domain
D. multiplication by e-sT in the s domain
12. 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
13. 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 ?
14. A system which is linear is said to obey the rules of
A. homogeneity
B. scaling
C. additivity
D. both scaling and additivity
15. 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
16. Which among the following operations is/are not involved /associated with the computation process of linear convolution?
A. Folding Operation
B. Shifting Operation
C. Multiplication Operation
D. Integration Operation
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. 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
19. 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
20. 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
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