1. The Laplace transformation of f (t) is
   

   F(s) =	ω	=
   	s2 + ω2

   
   the final value of f(t) is—
   

1. 1. infinity
      

   
   
   

   2. zero
      

   
   
   

   3. one
      

   
   
   

   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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2. Which one of the four signals flow graphs shown in (A), (B), (C) and (D) represents the block diagram shown in given figure?Kindle Edition.
   
   
   

1. 1. Fig :- A
      

   
   
   

   2. Fig :- B
      

   
   
   

   3. Fig :- C
      

   
   
   

   4. Fig :- D
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   On drawing the signal flow graph from the given block diagram, we get
   Hence alternative (A) is the correct answer.

   
   

   Correct Option: A

   On drawing the signal flow graph from the given block diagram, we get
   Hence alternative (A) is the correct answer.

   
   

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3. Sinusoidal oscillators are—
   

1. 1. stable
      

   
   
   

   2. unstable
      

   
   
   

   3. marginally stable
      

   
   
   

   4. conditionally stable

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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4. If the gain of the open-loop system is doubled, the gain margin—
   

1. 1. is not affected
      

   
   
   

   2. gets double
      

   
   
   

   3. becomes half
      

   
   
   

   4. becomes one-fourth

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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5. Consider the following properties attributed to state model of a system
   1. State model is unique
   2. State model can be derived from the system transfer function
   3. State model can be derived from time variant systems. Of these statements—
   

1. 1. 1, 2 and 3 are correct
      

   
   
   

   2. 1 and 2 are correct
      

   
   
   

   3. 2 and 3 are correct
      

   
   
   

   4. 1 and 3 are correct

   
   
   

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1. View Hint View Answer Discuss in Forum

   State model of a system is not unique.

   Correct Option: C

   State model of a system is not unique.

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