Logic Gates

Q. Figure gives a system of logic gates. From the study of truth table it can be found that to produce a high output (1) at R, we must have

1. X = 0, Y = 1
2. X = 1, Y = 1
3. X = 1, Y = 0
4. X = 0, Y = 0

Q. To get an output Y = 1 from the circuit shown in figure the inputs A, B and C must be respectively

1. 1, 0, 1
2. 1, 1, 0
3. 1, 0, 0
4. 0, 1, 0

Q.

Given below are symbols for some logic gates (1) (2) (3) (4) The XOR gate and NOR gate respectively are [AFMC 1994]

Q. How many NAND gates are used in an OR gate?

1. Four
2. Two
3. Three
4. Five

Q.

The truth table shown in figure is for [Pb. CET 1998] \( \begin{array}{lllll}\text { A } & 0 & 0 & 1 & 1\end{array} \) \( \begin{array}{lllll}\text { B } & 0 & 1 & 0 & 1\end{array} \) \( \begin{array}{lllll} Y & 1 & 0 & 0 & 1\end{array} \)

Q.

Which of the following gates will have an output of 1

1. 
   

2. 
   

3. 
   

4. 
   

Q.

Which represents NAND gate

1. 
   

2. 
   

3. 
   

4. 
   

Q.

A logic gate is an electronic circuit which

1. Makes logic decisions

2. Works binary algebra

3. Allows electrons flow only in one direction

4. Alternates between 0 and 1 values

Q.

1. An AND gate

2. An OR gate

3. A NAND gate

4. An NOT gate

Q.

1. OR gate

2. AND gate

3. NOT gate

4. None of above