146. What is the laplace transform of a delayed unit impulse function δ(t – 1) is

1. 1. η

   
   
   

   2. δ

   
   
   

   3. π

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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147. The discretetime system described by y(n) = x(n²) is

1. 1. causal, linear and time-varying

   
   
   

   2. causal, non-lnear and time-varying

   
   
   

   3. non-causal, linear and time-invariant

   
   
   

   4. non-causal, non-linear and time-variant

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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148. Which one of the following systems is a cuasual system ?
     [y(t) is output and u(t) is a input step function].

1. 1. y(t) = sin [u(t + 3)]

   
   
   

   2. y(t) = 5u(t) + 3u(t – 1)

   
   
   

   3. y(t) = 5u(t) + 3u(t + 1)

   
   
   

   4. y(t) = sin [u(t – 3) + sin [u(t + 3)]

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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149. A continuous-time system is governed by the equation 3y² (t) + 2y² (t) + y(t) = x² (t) + x(t){y(t) and x(t) respectively are output and input}. The system is

1. 1. linear and dynamic

   
   
   

   2. linear are non-dynamic

   
   
   

   3. non-linear and dynamic

   
   
   

   4. non-linear and non-dynamic

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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150. The discrete-time equation y(n + 1) + 0.5n y(n) = 0.5x(x + 1) is not attributable to a

1. 1. memoryless system

   
   
   

   2. time-variying system

   
   
   

   3. linear system

   
   
   

   4. causal system

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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