Electronics (ECE) - MCQ Practice Questions

What is the fundamental difference between combinational and sequential circuits?

In a synchronous counter with n flip-flops, what is the maximum frequency at which the counter can operate?

Which of the following is a characteristic of asynchronous counters?

A BCD counter counts from 0 to 9 and then resets. How many flip-flops are minimum required?

In a Johnson counter with 4 flip-flops, what is the maximum count sequence length?

Which logic gate is used in a full adder to generate the carry output?

What is the setup time of a flip-flop?

In a multiplexer (MUX) with 3 select lines, how many input lines can it handle?

A demultiplexer (DEMUX) with 4 select lines has how many output lines?

In a 3-to-8 decoder, if the enable pin is active low and all select lines are 0, what will be the output?

Which type of flip-flop has the simplest truth table and is used for frequency division?

In Gray code, how many bits change when transitioning from 5 (0101) to 6 (0110)?

A 32×8 ROM has how many address lines and data lines respectively?

Which of the following is a volatile memory?

A 4-bit Ripple Carry Adder has a total propagation delay of 12 ns. If each full adder stage has a propagation delay of 3 ns, what is the delay for carry propagation?

Which of the following is a sequential circuit?

In Hamming code for single error correction, if the total number of data bits is 16, how many parity bits are required?

What is the main advantage of a Carry Lookahead Adder (CLA) over a Ripple Carry Adder (RCA)?

A SRAM cell requires how many transistors for a 1-bit storage?

In state machine design, if a machine has 15 different states, the minimum number of flip-flops needed is?