BEE Digital Logic and Systems 3

Question 1

Which number system uses base 16 and includes digits 0-9 and letters A-F?

Accepted Answer

Hexadecimal

Answer

Hexadecimal (base-16) uses digits 0–9 and letters A–F to represent values 0–15 in a single digit, commonly used in digital systems.

Question 2

A D flip-flop is triggered on the rising edge of the clock. If D=1 at the rising edge, the next state Q+ is:

Accepted Answer

1

Answer

A D flip-flop copies the input D to the output Q on the active clock edge, so Q+ = D = 1.

Question 3

What is the 2's complement representation of -6 using 4 bits?

Accepted Answer

1010

Answer

+6 in 4 bits is 0110; inverting gives 1001, adding 1 yields 1010, which is the 2's complement of -6.

Question 4

Which combinational circuit converts a binary code to a one-hot encoded output?

Accepted Answer

Decoder

Answer

A decoder takes an n-bit binary input and activates exactly one of 2ⁿ output lines, producing a one-hot (active-high) output.

Question 5

In digital logic, glitches (hazards) in combinational circuits are caused by:

Accepted Answer

Unequal propagation delays through different paths

Answer

Glitches occur when signal transitions take different amounts of time through alternate paths, causing momentary incorrect output values.

BEE - Bachelor of Electrical Engineering Practice Test