ઔદ્યોગિક સેન્સરો અંગે નીચેનાં વિધાનો ધ્યાનમાં લો:
1. ઇન્ડક્ટિવ પ્રોક્સિમિટી સેન્સર (Inductive proximity sensors) ભૌતિક સંપર્ક વિના ધાતુની વસ્તુઓ શોધવા વપરાય છે.
2. કેપેસિટિવ સેન્સર (Capacitive sensors) ધાતુ અને બિનધાતુ (પ્રવાહી, પ્લાસ્ટિક) બંને પદાર્થો શોધી શકે છે.
3. ઊંચી ચોકસાઈના માપન માટે RTD થર્મોકપલ કરતાં ઓછા ચોક્કસ છે.
ઉપર આપેલાં વિધાનોમાંથી કયું/કયાં સાચું/સાચાં છે?
જવાબ અને પગલાવાર ઉકેલ
A — ફક્ત 1 અને 2. ઇન્ડક્ટિવ સેન્સર વિદ્યુતચુંબકીય ક્ષેત્રના ફેરફારથી ધાતુ શોધે છે; કેપેસિટિવ સેન્સર ડાઇઇલેક્ટ્રિક ફેરફારથી ધાતુ, પ્લાસ્ટિક, પાઉડર અને પ્રવાહી ઓળખે છે. RTD (જેમ કે Pt100) ચોકસાઈભર્યા માપનમાં થર્મોકપલ કરતાં વધુ ચોક્કસ છે.
વિગતવાર ઉકેલ (મૂળ ભાષામાં)
Statement-wise Verification
- Statement 1 - Correct.
Inductive proximity sensors are used to detect metallic objects without physical contact.
Inductive proximity sensors detect conductive/metal targets through electromagnetic field changes. - Statement 2 - Correct.
Capacitive sensors can detect both metallic and non-metallic (liquid, plastic) materials.
Capacitive proximity sensors respond to dielectric changes and can detect metals, plastics, powders and liquids. - Statement 3 - Incorrect.
RTDs (Resistance Temperature Detectors) are less accurate than thermocouples for high-precision measurements.
The correct principle is: RTDs are valued for accuracy and stability over moderate temperature ranges, whereas thermocouples cover much higher ranges and rugged conditions.
Core Concept
Inductive proximity sensors detect conductive/metal targets through electromagnetic field changes. Capacitive proximity sensors respond to dielectric changes and can detect metals, plastics, powders and liquids. RTDs are valued for accuracy and stability over moderate temperature ranges, whereas thermocouples cover much higher ranges and rugged conditions.
Formula / Key Relationship
Pt100: ~100 Ω at 0°C (standard platinum RTD).
Why the Other Options Are Wrong
Option B is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 1. Option C is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 2. Option D is incorrect because it includes incorrect statement(s) 3.
Exam Shortcut / Approach
Accuracy/stability → RTD; very high temperature/rugged → thermocouple.
Common Mistake
RTDs are not generally less accurate than thermocouples for precision measurement.
Quick Revision
Inductive Capacitive Sensors and RTD is linked with Proximity and Temperature Sensors, Sensors and Industrial Automation. Accuracy/stability → RTD; very high temperature/rugged → thermocouple.
Consider the following statements regarding industrial sensors:
1. Inductive proximity sensors are used to detect metallic objects without physical contact.
2. Capacitive sensors can detect both metallic and non-metallic (liquid, plastic) materials.
3. RTDs (Resistance Temperature Detectors) are less accurate than thermocouples for high-precision measurements.
Which of the statements given above is/are correct?
Answer & step-by-step solution
Inductive proximity sensors detect conductive/metal targets through electromagnetic field changes. Capacitive proximity sensors respond to dielectric changes and can detect metals, plastics, powders and liquids. Key relation: Pt100: ~100 Ω at 0°C (standard platinum RTD).
Exam focus: Accuracy/stability → RTD; very high temperature/rugged → thermocouple. Common trap: RTDs are not generally less accurate than thermocouples for precision measurement.
Statement-wise Verification
- Statement 1 - Correct.
Inductive proximity sensors are used to detect metallic objects without physical contact.
Inductive proximity sensors detect conductive/metal targets through electromagnetic field changes. - Statement 2 - Correct.
Capacitive sensors can detect both metallic and non-metallic (liquid, plastic) materials.
Capacitive proximity sensors respond to dielectric changes and can detect metals, plastics, powders and liquids. - Statement 3 - Incorrect.
RTDs (Resistance Temperature Detectors) are less accurate than thermocouples for high-precision measurements.
The correct principle is: RTDs are valued for accuracy and stability over moderate temperature ranges, whereas thermocouples cover much higher ranges and rugged conditions.
Core Concept
Inductive proximity sensors detect conductive/metal targets through electromagnetic field changes. Capacitive proximity sensors respond to dielectric changes and can detect metals, plastics, powders and liquids. RTDs are valued for accuracy and stability over moderate temperature ranges, whereas thermocouples cover much higher ranges and rugged conditions.
Formula / Key Relationship
Pt100: ~100 Ω at 0°C (standard platinum RTD).
Why the Other Options Are Wrong
Option B is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 1. Option C is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 2. Option D is incorrect because it includes incorrect statement(s) 3.
Exam Shortcut / Approach
Accuracy/stability → RTD; very high temperature/rugged → thermocouple.
Common Mistake
RTDs are not generally less accurate than thermocouples for precision measurement.
Quick Revision
Inductive Capacitive Sensors and RTD is linked with Proximity and Temperature Sensors, Sensors and Industrial Automation. Accuracy/stability → RTD; very high temperature/rugged → thermocouple.
औद्योगिक सेंसरों के संबंध में निम्नलिखित कथनों पर विचार कीजिए:
1. प्रेरणिक प्रॉक्सिमिटी सेंसर (Inductive proximity sensors) बिना भौतिक संपर्क के धात्विक वस्तुओं का पता लगाने में उपयोग होते हैं।
2. धारितीय सेंसर (Capacitive sensors) धात्विक और अधात्विक (द्रव, प्लास्टिक) दोनों पदार्थों का पता लगा सकते हैं।
3. उच्च-परिशुद्धता मापन के लिए RTD, थर्मोकपल से कम सटीक होते हैं।
ऊपर दिए गए कथनों में से कौन-सा/से सही है/हैं?
उत्तर और चरणबद्ध हल
A — केवल 1 और 2। प्रेरणिक सेंसर विद्युतचुंबकीय क्षेत्र परिवर्तन से धातु का पता लगाते हैं; धारितीय सेंसर परावैद्युत परिवर्तन से धातु, प्लास्टिक, पाउडर और द्रव पहचानते हैं। RTD (जैसे Pt100) परिशुद्ध मापन में थर्मोकपल से अधिक सटीक होते हैं।
विस्तृत हल (मूल भाषा में)
Statement-wise Verification
- Statement 1 - Correct.
Inductive proximity sensors are used to detect metallic objects without physical contact.
Inductive proximity sensors detect conductive/metal targets through electromagnetic field changes. - Statement 2 - Correct.
Capacitive sensors can detect both metallic and non-metallic (liquid, plastic) materials.
Capacitive proximity sensors respond to dielectric changes and can detect metals, plastics, powders and liquids. - Statement 3 - Incorrect.
RTDs (Resistance Temperature Detectors) are less accurate than thermocouples for high-precision measurements.
The correct principle is: RTDs are valued for accuracy and stability over moderate temperature ranges, whereas thermocouples cover much higher ranges and rugged conditions.
Core Concept
Inductive proximity sensors detect conductive/metal targets through electromagnetic field changes. Capacitive proximity sensors respond to dielectric changes and can detect metals, plastics, powders and liquids. RTDs are valued for accuracy and stability over moderate temperature ranges, whereas thermocouples cover much higher ranges and rugged conditions.
Formula / Key Relationship
Pt100: ~100 Ω at 0°C (standard platinum RTD).
Why the Other Options Are Wrong
Option B is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 1. Option C is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 2. Option D is incorrect because it includes incorrect statement(s) 3.
Exam Shortcut / Approach
Accuracy/stability → RTD; very high temperature/rugged → thermocouple.
Common Mistake
RTDs are not generally less accurate than thermocouples for precision measurement.
Quick Revision
Inductive Capacitive Sensors and RTD is linked with Proximity and Temperature Sensors, Sensors and Industrial Automation. Accuracy/stability → RTD; very high temperature/rugged → thermocouple.
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