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Junior Cycle Engineering: Control systems & logic gates

How often Control systems & logic gates comes up on the Engineering papers, every year it was asked, and questions to try.

CL Asked on 5 of the last 5 Common Level papers, most recently in 2026. banker

Control systems & logic gates, Common Level(6 marks)

Quick ones on Control systems & logic gates.

(a)Which logic gate gives an output of 1 only when both of its inputs are 1?
  1. OR
  2. AND
  3. NOT
(b)Which logic gate gives an output of 1 if either input, or both, is 1?
  1. NAND
  2. AND
  3. OR
(c)Which logic gate has one input and always gives the opposite at its output?
  1. NOT
  2. NOR
  3. AND
Show the answers

(a) AND

(b) OR

(c) NOT

Your turn: Common Level questions on Control systems & logic gates.

Common Level

Asked on 5 of the last 5 Common Level papers, most recently in 2026. banker

Every paper, year by year

YearWhere it came up
2026Q3a, Q3d, Q4b
2025Q3d, Q3g
2024Q2a, Q3d
2023Q4b, Q4c
2022Q3b

Links open the State Examinations Commission’s paper for that year.

More Control systems & logic gates questions

Control systems & logic gates, 2 marks

What are the three main parts of a control system, in order?

  1. Output, input, process
  2. Process, output, input
  3. Input, process, output
Show the answer

Input, process, output

The input, such as a sensor or switch, detects something; the process, such as a microcontroller or logic gate, decides; the output, such as a motor, LED or buzzer, acts.

Control systems & logic gates, 2 marks

Which of these is an input device?

  1. Light-emitting diode
  2. Push-to-make switch
  3. Piezo buzzer
Show the answer

Push-to-make switch

Input devices sense or detect: switches, keypads, sensors and microphones. Output devices act: buzzers make sound, LEDs give light and motors give movement.

Control systems & logic gates, 2 marks

Mechatronics combines which fields of engineering?

  1. Mechanical, electronic and computing
  2. Civil, chemical and structural
  3. Marine, mining and agricultural
Show the answer

Mechanical, electronic and computing

Mechatronics joins mechanical parts (gears, levers), electronics (sensors, circuits) and computing (programs, microcontrollers) into one system, such as a robot or a car-park barrier.

Other Engineering topics

All of Junior Cycle Engineering