Combinational Logic Circuits

The basic logic gate whose output is the complement of the input is the

• AND gate 
• NAND gate
• OR gate
• Inverter (Not gate)

How many NAND gates are available   in a 2 inputs7400 NAND IC:

• 2
• 3
• 4
• 1

Which of the following logical operation is represented by the (+) sign in Boolean algebra?:

• AND gate
• OR gate
• NOT gate
• NAND gate

The output of a NAND gate is Low (0) if?

• all inputs are HIGH (1)
• any input is HIGH(1)
• any input is LOW (0)
• all inputs are LOW (0)

The output of a NOR gate is HIGH (1) if?

• All inputs are HIGH (1) 
• Any input is HIGH(1)
• Any input is LOW (0)
• All inputs are LOW (0)

If the input to a NOT gate is A and the output is X, then?

• X = A 
• X = 0
• X = Ᾱ
• X = 1

Which Logic gate represents the symbol shown in  Figure 1

• NOR
• AND
• OR
• NOT

Which Logic gate represents the symbol shown in  Figure 2

• NOR
• AND
• NAND
• NOT

Which Logic gate represents the symbol shown in  Figure 3

• NOR
• AND
• NAND
• NOT

Which Logic gate represents the symbol shown in  Figure 4

• AND gate
• X-OR gate
• NOT gate
• NAND gate