Signals and Systems – Multiple Choice Questions (MCQs)

1. 85. The Fourier Series is applicable only for ________ signals.

   • A. Aperiodic
   • B. Periodic
   • C. Energy
   • D. Power

2. 86. The Laplace Transform of the unit impulse response is the:

   • A. Transfer function
   • B. Frequency response
   • C. Input signal
   • D. Output signal

3. 87. The Z-transform of the impulse response is the:

   • A. Transfer function
   • B. Frequency response
   • C. Input signal
   • D. Output signal

4. 88. An unstable system can be made stable by:

   • A. Increasing the gain
   • B. Adding poles to the right half plane
   • C. Using feedback
   • D. Removing all zeros

5. 89. The output y(t) of an LTI system with impulse response h(t) and input x(t) is given by:

   • A. x(t) + h(t)
   • B. x(t) * h(t) (convolution)
   • C. x(t) . h(t) (multiplication)
   • D. x(t) - h(t)

6. 90. The magnitude spectrum of a real signal is always:

   • A. Even
   • B. Odd
   • C. Complex
   • D. Zero

7. 91. The phase spectrum of a real signal is always:

   • A. Even
   • B. Odd
   • C. Complex
   • D. Zero