This set of IOT Multiple Choice Questions & Answers (MCQs) focuses on “Proximity Sensor”.
1. Which sensor can detect nearby objects?
a) Proximity sensor
b) Humidity sensor
c) Touch sensor
d) Pressure sensor
View Answer
Explanation: A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. A proximity sensor often emits an electromagnetic field or a beam of electromagnetic radiation, and looks for a change in the return signal.
2. The monitoring of machines, gears and objects are achieved by which sensor?
a) Humidity sensor
b) Proximity sensor
c) Touch sensor
d) Pressure sensor
View Answer
Explanation: The monitoring of machines, gears and objects are achieved precisely by the IOT(INTERNET OF THINGS) wireless proximity sensors. They are used in industries ranging from robotics to machine tools, from measuring instruments to assembly lines, from the food sector to chemical industry, etc.
3. Which proximity sensor detects metal objects?
a) Capacitive Proximity Sensor
b) Magnetic Proximity Sensor
c) Ultrasonic Proximity Sensor
d) Inductive Proximity Sensor
View Answer
Explanation: An inductive proximity sensor can detect metal targets approaching the sensor, without physical contact with the target. Inductive Proximity Sensors are roughly classified into the following three types according to the operating principle:
i) The high-frequency oscillation type using electromagnetic induction
ii) The magnetic type using a magnet
iii) The capacitance type using the change in capacitance.
4. Which proximity sensor indicates level?
a) Inductive Proximity Sensor
b) Capacitive Proximity Sensor
c) Magnetic Proximity Sensor
d) Ultrasonic Proximity Sensor
View Answer
Explanation: Capacitive Proximity Sensor indicates level and the fill amount present in containers, behind covering. They are used to track all objects including non-metallic ones.
5. Which proximity sensors are used in automotive?
a) Inductive Proximity Sensor
b) Capacitive Proximity Sensor
c) Magnetic Proximity Sensor
d) Ultrasonic Proximity Sensor
View Answer
Explanation: Ultrasonic Proximity Sensors are used in automotive.They are widely used in automotive such as parking sensors.
6. Which proximity sensor detects positioning of an object?
a) Inductive Proximity Sensor
b) Capacitive Proximity Sensor
c) Optical Proximity Sensor
d) Magnetic Proximity Sensor
View Answer
Explanation: Optical Proximity Sensor recognizes, for non-contact and precisely, the positioning of the object.
7. Are proximity sensors used in retail settings?
a) True
b) False
View Answer
Explanation: A retailer can use a customer’s proximity to a product to send deals and coupons directly to their smart phone.
8. VCNL4100CT allows the proximity detection up to________
a) 2 meter
b) 1 meters
c) 0.5 meters
d) 1.5 meters
View Answer
Explanation: VCNL4100CT expand the range of applications by introducing a high-power IR emitter that allows proximity detection up to one meter.
9. Which protocol is used by proximity sensor?
a) I2C
b) SPI
c) UART/USART
d) CAN
View Answer
Explanation: Microcontroller communication is via standard I2C, where the host can set measurement parameters and request results. If desired, programmable threshold allow the VCNL4100 to interrupt the host once threshold values are crossed, thereby minimizing device polling.
10. Does proximity sensor have a temperature sensor in it?
a) True
b) False
View Answer
Explanation: A buit-in temperature sensor is used by the signal processing circuitry to provide stable outputs across the temperature range -40 oC to +85oC.
11. Which device generates output signal when metal objects are either inside or entering into sensing area.
a) Capacitive Proximity
b) Magnetic Proximity
c) Inductive proximity
d) Parallel Proximity
View Answer
Explanation: The Inductive Proximity Sensor is a solid state device which generates an output signal when metal objects are either inside or entering into its sensing area from any direction.
12. ________ detects metals but along with it can also detect resins, liquids.
a) Inductive proximity
b) Capacitive Proximity
c) Magnetic Proximity
d) Parallel Proximity
View Answer
Explanation: Capacitive Proximity can also detect metals but along with it can also detect resins, liquids, powders, etc. This sensor working can vary accordingly covering material, cable longness, noise sensitivity.
13. _________ sensors have no electrical noise effect and it can work DC.
a) Inductive proximity
b) Capacitive Proximity
c) Magnetic Proximity
d) Parallel Proximity
View Answer
Explanation: Magnetic proximity sensors have no electrical noise effect and it can work on DC, AC, AC/DC.
14. What is the sensing range for magnetic proximity sensors?
a) 120mm
b) 90mm
c) 150mm
d) 100mm
View Answer
Explanation: Magnetic proximity sensors have no electrical noise effect and it can work on DC, AC, AC/DC. These types of sensors have highest sensing range upto 120mm.
15. What is the sensing range for capacitive proximity sensors?
a) 150mm
b) 25mm
c) 120mm
d) 100mm
View Answer
Explanation: Capacitive Proximity can also detect metals but along with it can also detect resins, liquids, powders, etc. This sensor working can vary accordingly covering material, cable longness, noise sensitivity.Its maximum range of sensing is 25mm.
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