The GATE Grind

GATE Digital Circuits: Computer Organization – Previous Year Questions

7 GATE previous year questions on Computer Organization (Digital Circuits, Electronics and Communication Engineering) with answers and explanations, from every paper.

  1. GATE 2017 EC Q26 (1 mark, Multiple choice) – The clock frequency of an 8085 microprocessor is 5 MHz. If the time required to execute an instruction is 1.4 s, then the number of T-states needed…
  2. GATE 2017 EC Q55 (2 marks, Multiple choice) – The following FIVE instructions were executed on an 8085 microprocessor. The Accumulator value immediately after the execution of the fifth…
  3. GATE 2015 EC Q24 (1 mark, Multiple choice) – In an 8085 microprocessor, the shift registers which store the result of an addition and the overflow bit, respectively
  4. GATE 2016 EC Q54 (2 marks, Multiple choice) – In an 8085 system, a PUSH operation requires more clock cycles than a POP operation. Which one of the following options is the correct reason for…
  5. GATE 2020 EC Q29 (1 mark, Numerical answer) – In an 8085 microprocessor, the number of address lines required to access a 16 K byte memory bank is .
  6. GATE 2021 EC Q42 (2 marks, Multiple choice) – The content of the registers are R 1=25H, R 2=30H and R 3=40H. The following machine instructions are executed. PUSHR1 PUSHR2 PUSHR3 POPR1 POPR2 POPR3…
  7. GATE 2024 EC Q27 (1 mark, Numerical answer) – A machine has a 32-bit architecture with 1-word long instructions. It has 24 registers and supports an instruction set of size 40. Each instruction…