Electronics & Communication System - Signal Systems

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7.

The differentiation of a unit step signal is ?                        
A. ramp signal B. impulse signal
C. exponential signal D. parabolic signal



8.

Which of the following is a stable system ?                        
A. y(t)=t*x(t) B. y(t)=t^2*x(t)
C. y(t)=(e^t)*x(t) D. y(t)=(e^(-t))*x(t)



9.

If the function x(t) has odd and half wave symmetry, then the fourier series will have only                        
A. Odd harmonics of sine terms B. Even harmonics of cosine terms
C. Even harmonics of sine terms D. Odd harmonics of cosine terms




10.

The fourier transform of x(t)=e^(7t)*u(-t) is                        
A. 1/(7+jw) B. 7/(1+jw)
C. 7/(1-jw) D. 1/(7-jw)



11.

The functions sin nωot, and sin mωot are always                        
A. Orthogonal B. Parallel
C. Inclined D. None



12.

The sum of discrete exponentials with infinite amplitudes gives                        
A. Complex wave B. Periodic wave
C. Non periodic wave D. All of the above



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