Input Devices and Control Systems

This video tutorial by Yaser Ahmed covers Chapter 2.1 of the ICT ICC course, focusing on input devices and their uses. It explains various input devices like keyboards, numeric keypads, mice, touchpads, and trackballs, and their applications. The video also discusses output devices such as monitors, printers, and speakers. Additionally, it delves into the role of sensors in control systems, using a greenhouse as an example to illustrate how sensors and microprocessors work together to maintain optimal conditions.

Which of the following is a primary advantage of using a keyboard as an input device?

• It is more accurate than a mouse.

• It requires no physical contact.

• It is easy to use and allows quick data entry.

• It is faster than all other input devices.

What is a significant disadvantage of using a mouse as a pointing device?

• It is not compatible with laptops.

• It cannot be used for gaming.

• It requires a flat surface and can be easily damaged.

• It is more expensive than a tracker ball.

Why might a tracker ball be preferred over a mouse?

• It is less expensive.

• It is more familiar to users.

• It is more accurate and suitable for users with limited wrist mobility.

• It requires no surface to operate.

In what scenario is a joystick most effectively used?

• Navigating spreadsheets

• Playing video games

• Designing graphics

• Typing documents

What is a unique feature of touchscreens compared to other input devices?

• They are the most durable input devices.

• They are only used in gaming.

• They function as both input and output devices.

• They require a stylus to operate.

Which device is used to convert analog signals from sensors into digital signals?

• Microprocessor

• Converter

• Actuator

• Transmitter

What type of sensor would be used to monitor moisture levels in a greenhouse?

• Light sensor

• Temperature sensor

• Humidity sensor

• Pressure sensor

How does a microprocessor use sensor data in a control application?

• It stores the data for future use.

• It compares the data to preset values and adjusts conditions accordingly.

• It sends the data to a printer.

• It displays the data on a monitor.

What is a disadvantage of using automated systems in greenhouses?

• They cannot be used for temperature control.

• They require constant human supervision.

• They are less accurate than manual methods.

• They have high initial and maintenance costs.

What is the role of an actuator in a control system?

• To change physical conditions based on sensor data

• To measure physical variables

• To convert analog signals to digital

• To store sensor data