Logic Gates

The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B, and C are as shown below:

The logic circuit gate is:

1. AND gate

2. NAND gate

3. NOR gate

4. OR gate

In the following circuit, the output for all possible inputs and is expressed by the truth table: 
 

The circuit is equivalent to: 

1. AND gate
2. NAND gate
3. NOR gate
4. OR gate

The symbolic representation of four logic gates is as shown:

(i)		(ii)
(ii)		(iv)

The logic symbols for OR, NOT, and NAND gates are respectively:
1. (iii), (iv), (ii)
2. (iv), (i), (iii)
3. (iv), (ii), (i)
4. (i), (iii), (iv)

To get an output Y = 1 from the circuit shown below, the input must be:

1. A=0 B=1 C=0

2. A=0 B=0 C=1

3. A=1 B=0 C=1

4. A=1 B=0 C=0

The symbolic representation of four gates is shown as: 

Pick out which ones are for AND, NAND, and NOT gates, respectively.

The figure shows a logic circuit with two inputs and and the output . The voltage waveforms across , , and are as given. The logic circuit gate is:
 

1. gate
2. gate
3. gate
4. gate

The output of the logic circuit shown in the figure will be: 

1.
2.
3.
4. None of the above

What is the output in the following circuit, when all the three inputs , , and are first and then ? 

1.
2.
3.
4.

The given electrical network is equivalent to:

In the combination of the following gates, the output can be written in terms of inputs and as:

1.
2.
3.
4.

The correct Boolean operation represented by the circuit diagram given above is:

1.
2.
3.
4.

Which of the following gate is called the universal gate?
1. gate
2. gate
3. gate
4. gate

For the given circuit, the input digital signals are applied at the terminals , and . What would be the output at terminal ?

1.
2.
3.
4.