Computer Control And Data Logging

Question 1

Computer control systems use … as an input device to…

Answer 1

sensors, measure a physical quantity (e.g. Light or temperature)

Question 2

Light and temperature are analogue quantities, because they…

Answer 2

continuously vary

Question 3

An ….. is used to convert physical quantities into digital signals.

Answer 3

Analogue-Digital Converter (ADC)

Question 4

Data logging is…

Answer 4

the use of sensors to collect data automatically over a period of time

Question 5

Data logging can occur in…

Answer 5

hazardous locations

Question 6

Data logging can occur…

Answer 6

24/7

Question 7

Data logging is more precise than…

Answer 7

human beings

Question 8

Data collected by data logging is analysed using…

Answer 8

software

Question 9

What do computer control systems have which is when outputs of a system are routed back as inputs?

Answer 9

A feedback loop

Question 10

An actuator is an output device that…

Answer 10

moves or controls a mechanism

Question 11

Explain how a greenhouse retains temperature using a computer control system.
(Sensors, actuator, low)

Answer 11

1. Temperature sensors may detect the temperature as too high
2. An actuator will then open a window to cool the greenhouse
3. When the temperature becomes low enough again, the actuator will close the window

Question 12

Explain how traffic lights adjust their timings depending on the quantity of the cars detected passing on the road using a computer control system.
(Sensors, sent)

Answer 12

1. Motion or pressure sensors on the road detect the number of cars that pass by
2. The more cars that pass compared to how many are passing other sensors on other roads leading to the same lights system, the longer the light remains green for the majority