Digital System Projects Using HDL Questions with Answers | VHDL/Verilog MCQ | Page 3

The Digital System Projects Using HDL questions with answers section focuses on VHDL and Verilog-based digital design. These programming questions and answers are ideal for ECE students preparing for hardware design roles or competitive exams. You’ll learn about combinational and sequential circuits, FPGA implementation, and simulation testing through well-explained MCQs. Practicing these helps you understand how HDL languages model real hardware systems, a key skill for interviews at Intel, DRDO, and TCS Electronics divisions.

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Q21

Which is not a step in strategic planning for HDL development?

A There must be a way to test each piece.
B Each block must fit together to make up the whole system.
C The names of each input and output must be known.
D The exact operation of each block must be thoroughly defined and understood.

Answer: Option C

Q22

In the frequency counter, when is the new count stored in the display register?

A After disabling the counter
B When the count buffer is full
C After the sample interval is set
D When the timing and control block has put it there

Answer: Option A

Q23

What are two ways to remember the current state of a counter in VHDL?

A With FUNCTIONS and PROCESS
B With counters and timers
C With SIGNAL and VARIABLE
D With bit types

Answer: Option C

Q24

In the digital clock project, what type of counter is used to count to 59 seconds?

A MOD-60
B MOD-6
C BCD
D BCD followed by a MOD-6

Answer: Option D

Q25

In the keypad application, when all columns are HIGH, the ring counter is enabled and counting, and dav is LOW, what is the status of the d outputs?

A On
B Off
C Hi-Z
D 1011

Answer: Option C

Q26

In the frequency counter, what is the function of the Schmitt trigger circuit?

A To reduce input noise
B To condition the input signal
C To convert non-square waveforms
D To provide a usable signal to the display unit

Answer: Option C

Q27

List three basic blocks in the digital clock project.

A MOD-60, MOD-12 counters
B MOD-5, MOD-10, MOD-12 counters
C MOD-60, MOD-10 counters
D MOD-6, MOD-12, and MOD-10 counters

Answer: Option D

Q28

When designing an HDL digital system, which is the worst mistake one can make?

A Concluding that a fundamental block works perfectly
B Failing to provide proper documentation
C Adding blocks of code prior to testing them
D Overlooking a possible VARIABLE

Answer: Option A

Q29

In the keypad application, just after the 4 ms mark the simulation imitates the release of the key by changing the column value back to F hex, which causes the d output to go into its Hi-Z state. On the next rising clock edge, what happens to dav?

A It goes HIGH.
B It goes LOW.
C It goes to Hi-Z.
D It goes to 1111H.

Answer: Option B

Q30

For the frequency counter, which is not a control signal from the control and timing block?

A Clear
B Enable
C Reset
D Store

Answer: Option C

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Digital System Projects Using HDL Questions and Answers

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