146. Output Y is equal to—
     

1. 1. (A + B) C + DE

   
   
   

   2. ABC (D + E)

   
   
   

   3. (A + B) C + D + E

   
   
   

   4. (AB + C) DE

   
   
   

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1. View Hint View Answer Discuss in Forum

   
   From above figure
   F₁ = A + B, F₂ = A + B.C
   and F₃ = DE
   and, Y = F₂F₃ = (A + B) C + DE

   Correct Option: A

   
   From above figure
   F₁ = A + B, F₂ = A + B.C
   and F₃ = DE
   and, Y = F₂F₃ = (A + B) C + DE

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147. In sequential circuit, output at any instant of time depends on—

1. 1. only input present at that instant of time

   
   
   

   2. past output as well as present input

   
   
   

   3. only on past output

   
   
   

   4. only on past input

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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148. A combinational circuit is one in which the output depends on the—

1. 1. input

   
   
   

   2. input combination at that time

   
   
   

   3. input combination at that time and previous input combination

   
   
   

   4. present output and previous output
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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149. The number of switching function of 3 variables is—

1. 1. 8

   
   
   

   2. 64

   
   
   

   3. 128

   
   
   

   4. 256

   
   
   

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1. View Hint View Answer Discuss in Forum

   The number of switching function of 3 variables.
   
   Also 2³ = 8 States

   Correct Option: A

   The number of switching function of 3 variables.
   
   Also 2³ = 8 States

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150. A carry look ahead adder is frequently used for addition because it—

1. 1. is faster

   
   
   

   2. is more accurate

   
   
   

   3. uses fewer gates

   
   
   

   4. costs less

   
   
   

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1. View Hint View Answer Discuss in Forum

   It is faster as carry is generated in parallel at all stages of addition rather than sequentially as in ripple adders.

   Correct Option: A

   It is faster as carry is generated in parallel at all stages of addition rather than sequentially as in ripple adders.

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