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Topic Question Set

Q 1 :    

The output (Y) of the given logic implementation is similar to the output of an/a _______ gate.             [2025]

  • OR

     

  • NOR

     

  • AND

     

  • NAND

     

(2)

 

Q 2 :    

The output Y for the inputs A and B of the given logic circuit is          [2024]

  • A·B

     

  • A¯·B¯

     

  • A+B

     

  • A¯+B¯

     

(3)

 

Q 3 :    

When the output of an OR gate is applied as input to a NOT gate, then the combination acts as a           [2024]

  • NAND gate

     

  • NOR gate

     

  • AND gate

     

  • OR gate

     

(2)

For OR gate, Y = A + B

NOT gate is applied to Y,

So, when output of OR gate is applied as input to a NOT gate, then the combination acts as a NOR gate.

 

Q 4 :    

A logic circuit provides the output Y as per the following truth table:                   [2024]

The expression for the output Y is

  • A.B+A¯

     

  • A.B¯+A¯

     

  • B¯

     

  • B

     

(3)

Given truth table:

A B Y
0 0 1
0 1 0
1 0 1
1 1 0

 

The given truth table is satisfied by, the expression, Y=B¯

Q 5 :    

The output (Y) of the given logic gate is similar to the output of an/a            [2024]

  • NAND gate

     

  • NOR gate

     

  • OR gate

     

  • AND gate

     

(4)

So, the output Y represents AND gate.

 

Q 6 :    

For the following logic circuit, the truth table is                 [2023]

  •  

  •  

  •  

  •  

(4)

Here, NAND gate is followed by two NOT gates.

By using A = 0, B = 0, we get Y = 0

A = 0, B = 1, Y = 1

A = 1, B = 0, Y = 1

A = 1, B = 1, Y = 1

This corresponds to OR gate.

Q 7 :    

The truth table for the given logic circuit is                    [2022]

  •  

  •  

  •  

  •  

(3)

Output of the given circuit is

Therefore, the correct truth table corresponding to C=B¯ is

A B C = B¯
0 0 1
0 1 0
1 0 1
1 1 0

 

Q 8 :    

For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at the terminal y?             [2021]

  •  

  •  

  •  

  •  

(3)

Output of combination of logic gates is given as y=AB+BC¯

The output (y) can be represented as above.

 

Q 9 :    

For the logic circuit shown, the truth table is             [2020]
  • A B Y
    0 0 0
    0 1 0
    1 0 0
    1 1 1

     

  • A B Y
    0 0 0
    0 1 1
    1 0 1
    1 1 1

     

  • A B Y
    0 0 1
    0 1 1
    1 0 1
    1 1 0

     

  • A B Y
    0 0 1
    0 1 0
    1 0 0
    1 1 0

     

(1)

This AND Gate. So, the truth table is

 

Q 10 :    

The correct Boolean operation represented by the circuit diagram drawn is                    [2019]

  • NOR

     

  • AND

     

  • OR

     

  • NAND

     

(4)

LED bulb will light up if switch(s) A or B or both A and B is/are open. Hence it represents a NAND gate.