WJEC GCSE ICT Unit 3 - Data Logging and Control

The input device in a control system is called a ...

• Sensor

• Sizer

• Starter

• Printer

What sensor could be used to control a security light that turns on when it gets dark?

• Light

• Heat

• Humidity

• Proximity

What sensor could be used to control a security light that turns on when someone walks past?

• Motion

• Heat

• Humidity

• Proximity

A sensor used to measure moisture in the air is called a ...

• Humidity

• Heat

• Infared

• Light

Collecting readings at specific intervals is called ...

• Automation

• Data logging

• Blogging

Which of these is not an output device used in control systems?

• LED

• Motor

• Motion sensor

• Speaker

When the output of a system is used to influence input it is known as...

• Feedback
• Processing
• Automation
• Measuring

Advantages of computer control are

• The computer does not require paying

• Robots cannot think for themselves

• They can work in dangerous conditions

• They are expensive

Advantages of data logging are

• Data collection is automatic

• Recordings can be taken over a long period without someone forgetting

• If there is a fault it will take a long time to be noticed

• It is smarter than humans

Which is the missing step in this control sequence for an automatic door?

Start

Person approaches door

?

Actuator opens door

Actuator closes door

• Person presses button

• Sensor detects person

• Receptionist pushes button