Signals and Systems

Which of the following is not an example of signal

• Blood Pressure

• temperatre

• aircraft

• speech

The signal which is defined only at origin i.e only at t=0 is

• unit step signal

• impulse signal

• exponential signal

• ramp signal

Graphical representation of a signal in time domain is called

• Frequency Spectrum

• Frequency

• Waveform

• None of the above

An example of a discrete set of information/system is

• the trajectory of the Sun

• data on a CD

• universe time scale

• movement of water through a pipe

Under which conditions does an initially relaxed system become unstable?

• only if bounded input generates unbounded output

• only if bounded input generates bounded output

• only if unbounded input generates unbounded output

• only if unbounded input generates bounded output

Which of this is not a type of analog modulation

• amplitude modulation

• frequency modulation

• phase modulation

• frequency shift keying

Unit Step function is defined by

• u(n) = 1, n ≥ 0

  = 0, n < 0

• u(n) = 1, n = 0

  = 0, n ≠ 1

• u(n) = 1, n ≤ 0

  = 0, n ≠ 1

• u(n) = 1, n ≤ 0

  = 0, n ≥ 1

Is music playing from a record an analog or digital signal?

• Analog
• Digital

Numbers in a digital code can have _____ values.

• any
• only high
• only low
• only set

Numbers in an analog code can have _____ values.

• any
• only high
• only low
• only set