Computer Knowledge

Digital Logic and Microprocessors

735 Questions

Digital logic and microprocessors form the core of computer science, covering logic gates, combinational and sequential circuits, and CPU architecture. These topics are crucial for computer knowledge sections in technical exams. Test your digital electronics basics here.

Logic gates and circuitsCombinational vs sequential circuitsMicroprocessor instructionsTruth tables and boolean functions

Digital Logic and Microprocessors Questions

Multiple choice

The recognizing capabilities of NDFSM and DFSM where NDFSM - non deterministic finite state machine and DFSM - deterministic finite state machine

  1. may be different

  2. must be different

  3. must be same

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Non-deterministic finite state machines (NDFSM) and deterministic finite state machines (DFSM) are equivalent in terms of the class of languages they can recognize, which is the class of regular languages.

Multiple choice

Which of the following is/are Universal Logic Gates?

  1. NAND

  2. NOT

  3. NOR

  4. Both (1) and (3)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

NAND and NOR are Universal Logic Gates because these gates have the properties of combinations in them which can be used to accomplish any of the basic operations and can thus produce an inverter, OR / AND gate.

Multiple choice

Which of the following is the indicator of flags in status register in ALU?

  1. Carry

  2. Zero

  3. Sign

  4. All of the above

  5. Parity

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Flags hold a single bit to indicate certain conditions that arise during arithmetic and logical operations. The imporatant flag indicators are Carry , Zero , Sign and Parity .  Flags hold a single bit to indicate certain conditions that arise during arithmetic and logical operations. The imporatant flag indicators are Carry , Zero , Sign and Parity . 

Multiple choice

How can we implement DRAM cells?

  1. By using capacitors

  2. By using flags

  3. By using flip flops

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

DRAM cells are implemented by using capacitors, because they periodically refreshed, in a very short time.

Multiple choice

Which type of flip - flop racing problem does not exist?

  1. D flip fop

  2. Master slave J K flip flop

  3. S R fip flop

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Master slave J K flip flop prevents the data from racing through chain, at every clock pulse, the pattern is shifted only exactly one position.

Multiple choice

Full Adder has

  1. 4 inputs

  2. 8 inputs

  3. 3 inputs

  4. 2 inputs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A full adder circuit takes three inputs: two bits to be added (A and B) and a carry-in bit (Cin). It produces two outputs: a sum and a carry-out.