161. In an all NOR gate realization of a combinational circuit all EVEN and ODD level gate behaves like—

1. 1. OR and AND

   
   
   

   2. AND and OR

   
   
   

   3. OR and NOT

   
   
   

   4. NOR and AND

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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162. Simplified form of ZX + Z XY is—

1. 1. Z ( X + Y)

   
   
   

   2. Z + Y

   
   
   

   3. Z (X + Y)

   
   
   

   4. ZY + X

   
   
   

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1. View Hint View Answer Discuss in Forum

   Given expression,
   F = ZX + Z XY
   or F = Z (X + XY)
   or F = Z (X + Y) (Since X + XY = X + Y)

   Correct Option: C

   Given expression,
   F = ZX + Z XY
   or F = Z (X + XY)
   or F = Z (X + Y) (Since X + XY = X + Y)

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163. The parity bit is added for.........purposes.

1. 1. Coding

   
   
   

   2. Indexing

   
   
   

   3. Error correction

   
   
   

   4. Controlling

   
   
   

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1. View Hint View Answer Discuss in Forum

   Parity bit is added for error correction purposes.

   Correct Option: C

   Parity bit is added for error correction purposes.

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164. If m is the number of bits required to code N items in the binary form, then—

1. 1. m = log₁₀ N

   
   
   

   2. m > log_e N

   
   
   

   3. m ≥ log₂ N

   
   
   

   4. m = 2 log₁₀ N

   
   
   

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1. View Hint View Answer Discuss in Forum

   m ≥ log₂ N
   where,
   m = No. of bits
   N = Coded items

   Correct Option: C

   m ≥ log₂ N
   where,
   m = No. of bits
   N = Coded items

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165. Which of the following are universal gates?
     1. NAND
     2. NOR
     3. XOR
     Select the correct answer from the codes given below—

1. 1. 1 and 2 only

   
   
   

   2. 1 and 3 only

   
   
   

   3. 2 and 3 only

   
   
   

   4. 1, 2, and 3

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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