Test Your Knowledge - Free MCQ PRACTICE
by Saksham Chaudhry : Paschim Vihar, New Delhi 110063 T: 1142316457, 9810570740
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. The integral of k u(t) is
A. K ?(t) 
B. A ramp of slope k 
C. A ramp of slope 1/k  
D. 1/k ?(t)  

2. The theoretical power of white noise is
A. Infninite  
B. Depend upon frequency of signal  
C. Finite  
D. Zero 

3. Damped sinusoids are _____
A. Sinusoid signals divided by decaying exponentials 
B. Sinusoid signals divided by growing exponentials  
C. Sinusoid signals multiplied by growing exponentials  
D. Sinusoid signals multiplied by decaying exponentials  

4. 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 contains only fundamental and third harmonic 
C. The wave does not contain even harmonics  
D. The wave does not contain odd harmonics  

5. A time invariant system is a system whose output
A. Decreases with a delay in input  
B. Remains same with a delay in input  
C. Increases with a delay in input 
D. Vanishes with a delay in input  

6. 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 

7. 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 

8. What does the spectral density function of any signal specify?
A. Conservation of energy or power  
B. Generation of energy or power 
C. Consumption of energy or power  
D. Distribution of energy or power  

9. Which one of the following is correct? Energy of a power signal is
A. Finite  
B. Zero 
C. Infinite  
D. Zero to Infinity 

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

11. 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 frequency domain  
B. Multiplication by est0 in the time domain  
C. Multiplication by est0 in the frequency domain 
D. Multiplication by e-st0 in the time domain 

12. 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 

13. As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes
A. Multiplication by e-sT in the s domain 
B. Multiplication by s in the s domain  
C. Division by s in the s domain  
D. Division by e-sT in the s domain  

14. Which of the following is/are not a property/properties power spectral density function Sx(?)?
A. Sx(?) is a odd function of ?  
B. Sx(?) is non-positive function of ?Sx(?) ? 0 for all ? 
C. Sx(?) is a even function of ?  
D. Sx(?) is real function of ?  

15. 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 shifted step function originating at t = a  
B. A step function  
C. A pulse function 
D. Unit step function 

16. FIR digital filter having __________ stability than FIR filter.
A. Good stability  
B. Poor stability  
C. Stability not guarnteed  
D. Poor stability 

17. What is the nature of Fourier representation of a discrete & aperiodic signal?
A. Discrete & periodic  
B. Continuous & aperiodic  
C. Continuous & periodic  
D. Discrete and aperiodic  

18. The inverse Laplace transform of 1/(s – a)2 is
A. Eat  
B. T eat  
C. T2 eat 
D. Eat/t 

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

20. For Ergodic Process
A. Ensemble Average equal to time Average  
B. Ensemble Average > Time Average  
C. Ensemble Average is not equal to time Average  
D. Ensemble Average < Time Average 

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