COMBINATIONAL DIGITAL CIRCUITS

Which of the circuits in figure (a to d) is the sum-of-products implementation of figure (e)?

• a

• b

• c

• d

Which of the following logic expressions represents the logic diagram shown?

• X=AB’+A’B

• X=(AB)’+AB

• X=(AB)’+A’B’

• X=A’B’+AB

The device shown here is most likely a ________

• Comparator

• Demultiplexer

• Inverter

• Multiplexer

What type of logic circuit is represented by the figure shown below?

• EX-NOR

• EX-OR

• NAND

• AND

For the device shown here, assume the D input is LOW, both S inputs are LOW and the input is LOW. What is the status of the Y’ outputs?

• All are HIGH

• All are LOW

• All but Y0 are LOW

• All but Y0 are HIGH

3 bits full adder contains ________

• 3 combinational inputs

• 4 combinational inputs

• 6 combinational inputs

• 8 combinational inputs

Represent a decimal number 39 in BCD

The BCD number 101011 has _______ priority.

• Even

• Odd

• Both even and odd

• Undefined

Which gates are ideal for checking the parity bits?

• AND

• EX-NOR

• EX-OR

• NAND

What is the radix of hexadecimal number?

• 15

• 10

• 16

• 2