logic gates

• A=1 B=1 Q=0

• A=0 B=1 Q=1

• A=1 B=1 Q=1

• A=0 B=0 Q=1

Write out the Boolean expression.

• Q=NOT(A AND B)

  AND C

• Q=NOT(C AND B)

  AND C

• Q=OR(A)

  AND C

• Q=NOT(B)

  OR Cd

Write out the boolean expression.

• Q=(A AND B)

  AND (C NOT D)

• Q=(A OR B)

  NOT (B OR D)

• Q=(A NOT B) OR (C OR D)

• Q=(A OR B)

  AND (C OR D)

• 
• 
• 

What does Boolean logic use?

(a)  

• 1,1,1,0

• 0,0,01

• 1,0,0,1

• 1,1,1,1

• 
• 

With four signal inputs, how many possible outputs are there?

• 8

• 4

• 16

• 32

How do OR and XOR logic gates differ?

• An OR gate always outputs 0 no matter what the inputs whereas an XOR outputs a 1 if one or more of the inputs is a 1

• There is no difference

• An OR gate outputs a 1 if one or more of the inputs is a 1 whilst an XOR outputs a 1 if only one (not both) of the inputs is a 1

Which of the following are logic gates?

• OR, NOT, AND

• OR, AND, XOR

• OR, AND, XOR, NOT