Proximity Sensor Question & Answers July 9, 2022 By WatElectronics This article lists 75 Proximity Sensor MCQs for engineering students. All the Proximity Sensor Questions & Answers below include a hint and a link to the relevant topic wherever possible. This is helpful for users preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Proximity sensors. Sensors that are utilized in detecting any presence or the movement of objects without contacting them physically are known as Proximity Sensors. The info gathered in these sensors is captured and converted into an 'Electrical signal'. Proximity sensors are ‘contactless or non-contact’ ones. Due to this, there is no physical harm caused to the objects. These sensors work based on signals without any physical part intervention that makes movements. The signals transmitted are allowed by Proximity Sensors to monitor the area sensed close. There are various types of Proximity sensors. But the most commonly used ones are Capacitive and Inductive. These sensors measure the dynamically changed diameter, distance, and depth. Counting is one of the most common application areas where proximity sensors are placed. Even cell phones used nowadays have built-in IR sensors. 1). Proximity sensor is _______? Contact Sensor Non-Contact Sensor Humidity Sensor Piezoelectric Sensor None Hint 2). Proximity sensors are utilized for working along ___________? Delicate objects Unstable objects Unstable & Delicate objects Stable objects None Hint 3). Proximity sensors have ______? Low-speed response High-speed response Moderate speed response Constant speed None Hint 4). What happens to the output when the object entered into sensing area? ON signal generated No signal generated Object goes undetected Object detected & ON signal generated None Hint 5). What kind of sensors utilized in the detecting near objects? Proximity Sensor Pressure Sensor Touch sensor Piezoelectric Sensor None Hint 6). What do you refer the object detected using Proximity sensor? Spot Target Point Destination None Hint 7). What happens if the target size is lesser than Standard target? Sensing distance increase Sensing distance decrease Sensing distance doesn’t alter May or may not change None Hint 8). What happens if the target size is small? Target moved far Target moved closer Target moved away Target remain constant None Hint 9). Why do Proximity sensors is highly reliable? Absent Physical parts Contactless behavior Long Functional life All mentioned above None Hint 10). Proximity sensors are ______ by Surface? Affected Unaffected Altered None None Hint 11). How are proximity sensors affected? Ambient Temperature Objects surrounded By Other Sensors All mentioned above None Hint 12). What are the various proximity sensors? Capacitive Inductive Magnetic a, b & c None Hint 13). What are the various Capacitive proximity sensors? Dielectric type Conduction type Non-conduction type a & b None Hint 14). How the object proximity detected in capacitive proximity sensors? Varying Inductance Varying Capacitance Varying Magnetic field Varying Temperature None Hint 15). What are the factors that affect capacitance? Distance Size Velocity a & b None Hint 16). What type of proximity sensors are preferred for Liquid level detection? Capacitive Inductive Magnetic Photoelectric None Hint 17). What is the dielectric in capacitive proximity sensor? Solid Water Air Other liquids None Hint 18). What is the condition to detect target in dielectric capacitive sensor? Dielectric constant = Air Dielectric constant >Air Dielectric constant Dielectric constant ≥Air None Hint 19). Capacitance is _________ if the target is absent? Add description here! More High Less Remains same None Hint 20). How does the capacitance affected if the target moved closer to sensor? Capacitance remain same Capacitance increased Capacitance decreased Capacitance is constant None Hint 21). What kind of objects detected by Capacitive sensors? Metallic Non-metallic Liquid All mentioned above None Hint 22). How the capacitance and the oscillations amplitude affected in capacitive sensors? Direct in proportion Indirectly proportional Doesn’t get affected No change None Hint 23). Conductive Capacitive sensor has ______ in capacitor? One plate Two plates Three plates Four plates None Hint 24). For Electrically conductive materials ________ capacitive sensor is used? Dielectric type Conduction type Non-conduction type a & b None Hint 25). What happens if the oscillation exceeds Pre-determined values in Capacitive sensor? Target doesn’t reach sensor Target reached sensor Target moved away from sensor Target not detected None Hint Proximity Sensor MCQs for Interviews 26). What is the dielectric in conductive capacitive proximity sensors? Plastic Water Metal Air gap None Hint 27). Capacitive type proximity sensors maximum sensing range is _____? 10 mm 25 mm 100 mm 120 mm None Hint 28). Non-metals & metals both detected using _______ proximity sensors? Capacitive Inductive Magnetic Photoelectric None Hint 29). What types of proximity sensors detect presence of human? Capacitive Inductive Magnetic Photoelectric None Hint 30). What variant of Proximity Sensor utilized as Touch sensor? Capacitive Inductive Magnetic Photoelectric None Hint 31). What is principle based on Inductive proximity sensor works? Kepler’s law Charle’s law Faraday’s law Avagadro’s law None Hint 32). What type of oscillator used in Inductive proximity sensor? LC Oscillator RC Oscillator Relaxation Oscillator Non-linear Oscillator None Hint 33). What kind of proximity sensor is used in detection of metallic objects? Capacitive Inductive Magnetic Photoelectric None Hint 34). In Proximity sensor _______ is used for switching? BJT UJT Diode Non-Linear circuit None Hint 35). What transistor is used for positive side switching? PNP NPN UJT FET None Hint 36). NPN in BJT preferred for _________? Positive switching Negative switching Limit switching a & b None Hint 37). NMR in Inductive Proximity Sensor is ______? Nuclear Magneto Resonant Nuclei Magneto Resonance Nuclear Magnetic Resonance Nuclei Magnetic Resonant None Hint 38). What are the various types of Inductive Proximity sensor based on Structure? Built-in Amplifier Separate Amplifier Shielded Amplifier Built-in & Separate Amplifier None Hint 39). Do Inductive Proximity sensors detect dirty or wet metal objects? Yes No Impossible Based on type of metal None Hint 40). Which metal has a larger proximity to get detected using Inductive Proximity sensors? Copper Gold Lead Iron None Hint Proximity Sensor MCQs for Exams 41). How the objects detected using Photoelectric Proximity sensors? Transmitted light from sensor Reflected light from the object surface Based on touch a & b None Hint 42). What are the various configurations of Photoelectric Proximity Sensors? Reflective Sensors Through-Beam Sensors Diffuse Proximity Sensors All Mentioned Above None Hint 43). What happens in Reflective Sensor in presence of target? Emitter sent-out Light Detector collects reflected light Detector doesn’t collect reflected light a & b None Hint 44). What are the advantages of Reflective type Proximity Sensor? Easy to Install Less costlier Less accuracy Less Costly & Installed easily None Hint 45). What is the set-up of Through–Beam sensors? Emitter & Detector in one housing Emitter & a Separate detector Object functioning as Reflector Only Emitter is present None Hint 46). Which configuration of Photoelectric Proximity Sensor is complex while installation? Reflective Sensors Through-Beam Sensors Diffuse Proximity Sensors All mentioned above None Hint 47). Which is the accurate method of sensing in Photoelectric Proximity Sensors? Reflective Sensors Through-Beam Sensors Diffuse Proximity Sensors Can’t Determine None Hint 48). Which method has the Longest range of sensing in Photoelectric Proximity Sensors? Reflective Sensors Through-Beam Sensors Diffuse Proximity Sensors Reflective & Through-Beam None Hint 49). The object itself enact as reflector in ____________ type of photoelectric proximity sensors? Reflective Sensors Through-Beam Sensors Diffuse Proximity Sensors Reflective & Through-Beam None Hint 50). What type of magnet needed to measure high temperatures in Magnetic Proximity Sensor? Strong Temporary Permanent Adaptive None Hint 51). Which Proximity sensor measures temperature in harsh conditions? Capacitive Inductive Photoelectric Ultrasonic None Hint 52). The maximum sensing range of magnetic proximity sensors is ____? 25 mm 50 mm 75 mm 100 mm None Hint 53). GMR is __________? Giant Magneto-Resistive Global Magnet-Resistance Giant Magneto-Reluctance Giant Modulo-Reluctance None Hint 54). What principle is followed by magnetic proximity sensors? Capacitive Magnetic Resistive GMR None Hint 55). GMR structure is used in _____? GUI CPU RAM ROM None Hint 56). _____ in magnetic proximity sensors used in reading data in MEMs? RAM ROM GMR USB None Hint 57). Which sensor doesn’t get affected by electrical noise & work with DC? Capacitive Inductive Magnetic Ultrasonic None Hint 58). IR proximity sensor utilizes what kind of light for transmission? Visible Ultraviolet Radar Infra Red None Hint 59). Which sensors operate using sound frequency? Capacitive Inductive IR Ultrasonic None Hint 60). Ultrasonic Proximity sound frequencies range is _____? 20 – 50 K Hertz 20 – 50 Hertz 25 – 50 K Hertz 25 – 50 Hertz None Hint Proximity Sensor MCQs for Quiz 61). A Diffuse & Reflective sensor has Transmitter & Receiver in ____ housing? Same Different Separate Unassociated None Hint 62). At closer proximity ________ sensors are blind zoned? Capacitive Inductive IR Ultrasonic None Hint 63). Can a Human being detected using IR Proximity sensor? Capacitive Inductive IR Ultrasonic None Hint 64). Proximity sensors detect object using __________? Light Sound Electromagnetic (EM) field All mentioned above None Hint 65). On what basis the objects distance is determined in Ultrasonic Proximity sensors? Frequency difference Resistance Deflection Time difference None Hint 66). Which proximity sensors preferred in Food processing & Packing? Capacitive Inductive IR Ultrasonic None Hint 67). What is the purpose of Hall-effect sensor? Sensing Proximity Positioning Sensing Current All Mentioned Above None Hint 68). What type of Proximity sensors preferred in security systems? Capacitive Inductive IR Ultrasonic None Hint 69). Which Proximity sensor is preferred in Automotive Industry? Capacitive Inductive IR Ultrasonic None Hint 70). Food industry in cleaning department prefer ______ Proximity sensor? Capacitive Magnetic IR LiDAR None Hint 71). Which Proximity sensor reads temperature of objects moving dynamically? Capacitive Magnetic IR LiDAR None Hint 72). Which Proximity sensor has max. range of detecting temperature? Capacitive Inductive Photoelectric LiDAR None Hint 73). What type of protocol is followed by proximity sensors? I2C UART CAN SPI None Hint 74). What type of sensors detects the position of target? Capacitive Inductive Optical Magnetic None Hint 75). What proximity sensor placed in Mobiles to switch On/Off display? Capacitive Inductive Photoelectric Infra Red None Hint Read more about Proximity Sensor Please fill in the comment box below. Time's up
