This set of IOT Multiple Choice Questions & Answers (MCQs) focuses on “Touch Sensor”.
1. Other name for tactile sensor is______________
a) Pressure sensor
b) Humidity sensor
c) Touch sensor
d) Temperature sensor
View Answer
Explanation: Touch sensors are also called as tactile sensor and are sensitive to touch, force or pressure. These are one of the simplest and useful sensors.
2. How many types of touch sensors are present?
a) 2 types
b) 3 types
c) 4 types
d) 5 types
View Answer
Explanation: There are two types of Touch sensors: Capacitive sensor
Resistive sensor.
3. Which sensor is used in mobile phones?
a) Capacitive touch sensor
b) Temperature sensor
c) Humidity sensor
d) Weight sensor
View Answer
Explanation: Capacitive touch sensors are widely used in most of the portable devices like mobile phones and MP3 players. The reason for this development is durability, robustness, attractive product design and cost.
4. Capacitive touch sensor has moving parts.
a) True
b) False
View Answer
Explanation: Touch sensor, unlike mechanical devices, do not contain moving parts. Hence, they are more durable than mechanical input devices.
5. How many types the capacitive touch sensors are classified?
a) 1 type
b) 2 types
c) 3 types
d) 4 types
View Answer
Explanation: There are two types of capacitive touch sensors
1. surface capacitive sensing
2. Projected capacitive sensing
In surface capacitive sensing, an insulator is applied with a conductive coating on one side of its surface.
In projected capacitive sensing, the whole surface is not changed, but an X-Y grid conductive material is placed between two insulating materials.
6. Resistive touch sensor is used for longer time than capacitive touch sensor.
a) True
b) False
View Answer
Explanation: Resistive touch sensors are used for a longer time than capacitive solutions as they are simple control circuits. A resistive touch sensor does not depend on the electrical property of capacitance.
7. How many types of sensors are there in resistive touch sensor?
a) 2 types
b) 3 types
c) 4 types
d) 5 types
View Answer
Explanation: There are three types of resistive touch sensors:
- 4-wire resistive touch sensor
- 5-wire resistive touch sensor
- 8-wire resistive touch sensor
A 4-wire resistive touch sensor is most cost effective.
A 5-wire resistive touch sensor is most durable.
A 8-wire resistive touch sensor, each edge of the sensor provides a sensing line.
8. Which touchscreen is coated with a transparent material?
a) Capacitive touchscreen
b) SAW
c) Infrared
d) Resistive touchscreen
View Answer
Explanation: The inside surface of the Resistive touchscreen is coated with a transparent material that makes electrical contact when pressure is applied.
9. Which touchscreen offers 75% clarity?
a) Resistive touchscreen
b) Capacitive touchscreen
c) SAW
d) Infrared
View Answer
Explanation: Whilst resistive screens are durable and easy to integrate, they can only offer 75% clarity.
10. Which touchscreen is used for industrial purpose?
a) Resistive touchscreen
b) Capacitive touchscreen
c) SAW
d) Infrared
View Answer
Explanation: Commonly utilized for industrial purpose, capacitive touch screen consists of a glass overlay, coated with a conductive material such as Indium Tin Oxide.
11. SAW expanded as?
a) Surface Arrangement Wave
b) Screen Acoustic Wave
c) Screen Arrangement Wave
d) Surface Acoustic Wave
View Answer
Explanation: SAW (Surface Acoustic Wave) touch screen technology is based upon two transducers and a reflector placed on the glass surface. The wave is dispersed across the screen by bouncing off the reflector arrangement and received by the transducers.
12. Which touchscreen technology does not incorporate an overlay.
a) Resistive touchscreen
b) Infrared
c) Capacitive touchscreen
d) SAW
View Answer
Explanation: Infrared touch screen technology does not incorporate an overlay. Instead, a frame surrounding the display consists of LEDs on one side and phototransistor detector on the other.
13. Which touch screen technology is popular for its versatility?
a) Resistive touchscreen
b) Capacitive touchscreen
c) SAW
d) Optical Imaging
View Answer
Explanation: Optical imaging is a type of touch screen technology that is popular for its versatility and scalability. It relies on infrared lights.
14. Which touchscreen is made up a glass overlay.
a) Resistive touchscreen
b) Capacitive touchscreen
c) APR
d) SAW
View Answer
Explanation: An APR touch screen is made up of a glass overlay and four transducers attached to the back exterior. When the screen is touched, the friction creates acoustic waves.
15. Are APR touch screens touch resistances?
a) True
b) False
View Answer
Explanation: APR touch screens are water resistance, durable and scalable. An APR touch screen is made up of a glass overlay and four transducers attached to the back exterior. When the screen is touched, the friction creates acoustic waves.
Sanfoundry Global Education & Learning Series – IOT.
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