CET Digital Logic & Microprocessors 2

Question 1

In a microprocessor-controlled euthanasia chamber, a sensor outputs a HIGH signal when CO2 concentration exceeds 70%. Which logic gate produces a HIGH output only when BOTH the concentration sensor AND the door-closed sensor are HIGH?

Accepted Answer

AND gate

Answer

An AND gate outputs HIGH only when all inputs are simultaneously HIGH, making it ideal for safety interlocks requiring multiple conditions to be met.

Question 2

A euthanasia equipment controller uses an 8-bit binary counter to track cycle duration. What is the maximum decimal count value this counter can represent?

Accepted Answer

255

Answer

An 8-bit counter can represent values from 0 to 255 (2^8 - 1 = 255), giving 256 total states.

Question 3

Which number system uses only the digits 0 and 1 and is the native language of digital microprocessors in euthanasia equipment controllers?

Accepted Answer

Binary

Answer

Binary (base-2) is the fundamental number system of all digital microprocessors because electronic components naturally represent two states: on (1) and off (0).

Question 4

A gas flow controller in a euthanasia system uses a truth table with inputs A (flow valve) and B (pressure OK). The output is HIGH only when A=1 and B=0, OR when A=0 and B=1. Which gate implements this logic?

Accepted Answer

XOR gate

Answer

An XOR (exclusive OR) gate outputs HIGH only when inputs differ, matching the condition A=1,B=0 or A=0,B=1.

Question 5

In a microprocessor-based euthanasia system, the program counter (PC) register serves what primary function?

Accepted Answer

Holds the address of the next instruction to execute

Answer

The program counter always holds the memory address of the next instruction the CPU will fetch and execute, controlling program flow.

(CET) Certified Euthanasia Technician Practice Test

(CET) Certified Euthanasia Technician Practice Test

CET Digital Logic & Microprocessors 2