Signal Processing Quiz

Compute the amplitude scaled signal 3x[n], if x[n]={1,-1, 2,-2}.

• {3, -3, 6, -6}

• {1, 2}

• {1, -1}

• {2, 4}

• {2, 2, 1}

Identify the signal having an amplitude of one only at the time 't'=0

• Impulse Signal

• Step Signal

• Ramp Signal

• Sinusoidal Signal

• Rectangular Signal

Identify the signal having an amplitude equal to time 'n' for n>=0

• Ramp Signal

• Impulse Signal

• Step Signal

• Sinusoidal Signal

• Rectangular Signal

Select the relevant signal that best represents the response of a system to an ideal shock input:

• Impulse signal

• Ramp signal

• Step signal

• Sinusoidal signal

Recognize the correct statement regarding the behaviour of the unit step signal u(t):

• u(t)=0 for t<0and u(t)=1 for t≥0

• u(t)=1for all t

• u(t)=∞ at t=0

• u(t)is undefined for t<0

To obtain x(- 4n) from the given signal x(n), choose the operation precedence (or priority) rule used on the independent variable 'n'.

• Time reversal->Time scaling

• Time shifting ->Time Reflection

• Time reflection -> Time shifting

• Time scaling-> Time shifting

• Time reversal-> Amplitude scaling

To obtain x(-n+9) from the given signal x(n), choose the operation precedence (or priority) rule used on the independent variable 'n'.

• Time reflection -> Time shifting

• Time reversal->Time scaling

• Time shifting ->Time Reflection

• Time scaling-> Time shifting

• Time reversal-> Amplitude scaling

To obtain u(t-6), identify the operation performed on the independent variable 't':

• Time shifting

• Time reversal

• Time reflection

• Time scaling

• Amplitude scaling

A robotic arm receives a control signal x(t) for smooth movement. The engineer modifies it to x(4t) before applying it. Predict the effect of this change on the signal behavior.

• compressed

• expanded

• shifted

• reversed

• increased in amplitude

Name the signal x(t) = e-at.

• exponentially decreasing

• exponentially increasing

• constant DC

• sinusoidal

• step