BEE Digital Logic and Microprocessors 3

Question 1

Which of the following is a universal gate?

Accepted Answer

NAND

Answer

NAND is a universal gate because any Boolean function can be implemented using only NAND gates.

Question 2

What is the decimal equivalent of the 2's complement binary number 11110000?

Accepted Answer

-16

Answer

11110000 in 2's complement: invert to 00001111 = 15, add 1 = 16, so the value is -16.

Question 3

In a D flip-flop, what is the relationship between output Q and input D at the clock edge?

Accepted Answer

Q becomes D

Answer

A D flip-flop captures the value of D at the active clock edge and transfers it to Q.

Question 4

A multiplexer (MUX) with 3 select lines has how many data inputs?

Accepted Answer

8

Answer

A MUX with n select lines has 2^n data inputs; 2^3 = 8 data inputs.

Question 5

Which interrupt type cannot be disabled by software in most microprocessors?

Accepted Answer

Non-maskable interrupt (NMI)

Answer

Non-maskable interrupts (NMI) cannot be disabled by the programmer and are used for critical hardware events.

BEE - Bachelor of Electrical Engineering Practice Test