Here are the mostly asked sample technical interview questions for hardware design interviews. These are also relevant to written exam papers and placement papers about hardware designing.
What is the significance of set up time and hold time?

A circuit is provided to you and you have to draw the exact timing response for it.

How can you use Verilog or VHDL to draw any FSM?

Explain the method to find whether two 8-bit signals are same

Explain different types of adder circuits used in hardware design.

Draw the divide by 3 sequential circuit. The circuit should have 50% duty circle.

How does a binary counter work?

What is FSM?

How will you divide frequency of clock cycle by 2? Give a circuit to achieve this.

How can you derive an inverter from a two input NAND gate?

If you are given a singly linked list, how will you reverse the same?

Truth table for half adder circuit.

A combinational circuit with 2 registers run by a clock is provided to you. The delay of clock signal is less than that of combinational circuit. How will you manage it? You may be able to do this by breaking and pipelining the combinational circuit.

Design a Transmission Gate based D Latch.

How can you detect what sequence is arriving from a signal line.

How do we estimate the maximum clock frequency of a circuit?

Suppose you have to convert a Transmission Gate based XDR into a XNOR? How will you do it?

How does a RC circuit gets charged and discharged?