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

Why I/O terminals in a system are normally latched while address terminals are not?

  1. I/O needs to hold the output status even after the clock address does not.

  2. Address needs to hold status after the clock I/O does not.

  3. I/O terminals are not latched.

  4. Address terminals are latched.

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

Devices connected to I/O terminals are normally slower in access compared to the processor. So, data on the terminals may be available before the device accesses them. This data must remain on the terminal till device accesses it. This is possible only when the data is latched on the terminal. So, I/O are latched.

Multiple choice

In which, a latching circuit timed with the clock signal would most likely have to be connected to the IGFET gate to ensure full discharge of the capacitor when the comparator's output goes high?

  1. R-2R Ladder DAC

  2. Flash Type ADC

  3. Single Slope Integrating ADC

  4. Tracking Converter

  5. Half Subtractor
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Here, a latching circuit timed with the clock signal would most likely have to be connected to the IGFET gate to ensure full discharge of the capacitor when the comparator's output goes high.

Multiple choice

In which circuit, if any of the input resistor is different, the input voltages would have different degrees of effect on the output and the output voltage would not be a true sum?

  1. R-2R Ladder ADC

  2. Binary Weighted Input ADC

  3. Flash Type ADC

  4. Half Adder

  5. Resolution
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Here, if any of the input resistor is different, the input voltages would have different degrees of effect on the input and the output voltage would not be a true sum.

Multiple choice

Which of the following instructions perform a logical AND function between the specified byte, either in a register or in the address contained in the H and L registers, and the contents of the accumulator?

  1. AND Immediates

  2. ADD Instructions

  3. ADD Immediates

  4. AND Instructions

  5. MVI Group
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

These instructions perform a logical AND function between the specified byte, either in a register or in the address contained in the H&L registers, and the contents of the accumulator in 8085 processor.