1. Which sensor is used in mobile phones?
a) Capacitive touch sensor
b) Temperature sensor
c) Humidity sensor
d) Weight sensor
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.
2. How many types the capacitive touch sensors are classified?
a) 1 type
b) 2 types
c) 3 types
d) 4 types
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.
3. Resistive touch sensor is used for longer time than capacitive touch sensor.
a) True
b) False
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.
4. How many types of sensors are there in resistive touch sensor?
a) 2 types
b) 3 types
c) 4 types
d) 5 types
Explanation: There are three types of resistive touch sensors: 4-wire, 5-wire, 8-wire.
4-wire resistive touch sensor is most cost effective. 5-wire resistive touch sensors are most durable. 8-wire resistive touch sensor, each edge of the sensor provides a sensing line.
5. Which touchscreen is coated with a transparent material?
a) Capacitive touchscreen
b) SAW
c) Infrared
d) Resistive touchscreen
Explanation: The inside surface is coated with a transparent material that makes electrical contact when pressure is applied. Whilst resistive screens are durable and easy to integrate, they can only offer 75% clarity.
6. Which touchscreen is used for industrial purpose?
a) Resistive touchscreen
b) Capacitive touchscreen
c) SAW
d) Infrared
Explanation: Commonly utilized for industrial purpose, capacitive touch screen consists of a glass overlay, coated with a conductive material such as Indium Tin Oxide.
7. SAW expanded as?
a) Surface Arrangement Wave
b) Screen Acoustic Wave
c) Screen Arrangement Wave
d) Surface Acoustic Wave
Explanation: SAW 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.
8. Which touchscreen technology does not incorporate an overlay.
a) Resistive touchscreen
b) Infrared
c) Capacitive touchscreen
d) SAW
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.
9. Which touch screen technology is popular for its versatility?
a) Resistive touchscreen
b) Capacitive touchscreen
c) SAW
d) Optical Imaging
Explanation: This touch screen technology is popular for its versatility and scalability. Optical imaging relies on infrared lights.
10. Which touchscreen is made up a glass overlay.
a) Resistive touchscreen
b) Capacitive touchscreen
c) APR
d) SAW
Explanation: An APR touch screen is made up a glass overlay and four transducers attached to the back exterior. When the screen is touched, the friction creates acoustic waves.