# Interview Q & A **URL:** https://forumautomation.com/c/interview-questions-and-answers/32.md?page=3 [Latest](https://forumautomation.com/latest.md) · [Categories](https://forumautomation.com/categories.md) · [Tags](https://forumautomation.com/tags.md) **Page:** 4 --- ## [What is difference between IR sensor and ultrasonic sensor?](https://forumautomation.com/t/what-is-difference-between-ir-sensor-and-ultrasonic-sensor/12520)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [September 4, 2024, 2:33pm UTC](https://forumautomation.com/t/what-is-difference-between-ir-sensor-and-ultrasonic-sensor/12520 "2024-09-04T14:33:48Z")
What is difference between IR sensor and ultrasonic sensor? --- ## [What appliances have indutcion motors please tell me](https://forumautomation.com/t/what-appliances-have-indutcion-motors-please-tell-me/4706)
**Author:** [@eletricthrillz](https://forumautomation.com/u/eletricthrillz)\ **Replies:** 0\ **Last updated:** [September 20, 2018, 3:58pm UTC](https://forumautomation.com/t/what-appliances-have-indutcion-motors-please-tell-me/4706 "2018-09-20T15:58:08Z")
what appliances have inductyion motors and where can i find those appliances as cheap as possible/ --- ## [What is a Fire Alarm Cable?](https://forumautomation.com/t/what-is-a-fire-alarm-cable/13247)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [May 17, 2025, 3:54am UTC](https://forumautomation.com/t/what-is-a-fire-alarm-cable/13247 "2025-05-17T03:54:20Z")
What is a Fire Alarm Cable? --- ## [What is a Historian in SCADA?](https://forumautomation.com/t/what-is-a-historian-in-scada/12879)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 0\ **Last updated:** [December 4, 2024, 7:26am UTC](https://forumautomation.com/t/what-is-a-historian-in-scada/12879 "2024-12-04T07:26:22Z")
What is a Historian in SCADA? A SCADA historian is a specialized software program made to gather, store, and handle historical process data from many SCADA system sources. It allows users to access and examine past d… --- ## [What are the best testing and measuring instruments for accurate readings in the manufacturing industry?](https://forumautomation.com/t/what-are-the-best-testing-and-measuring-instruments-for-accurate-readings-in-the-manufacturing-industry/12778)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [November 6, 2024, 4:22pm UTC](https://forumautomation.com/t/what-are-the-best-testing-and-measuring-instruments-for-accurate-readings-in-the-manufacturing-industry/12778 "2024-11-06T16:22:48Z")
What are the best testing and measuring instruments for accurate readings in the manufacturing industry? --- ## [Can we use the electric wire for data transmission?](https://forumautomation.com/t/can-we-use-the-electric-wire-for-data-transmission/11215)
**Author:** [@Sudha\_m](https://forumautomation.com/u/Sudha_m)\ **Replies:** 0\ **Last updated:** [June 4, 2023, 5:11pm UTC](https://forumautomation.com/t/can-we-use-the-electric-wire-for-data-transmission/11215 "2023-06-04T17:11:30Z")
Yes, electric lines can be used to send information in some situations. But it’s important to remember that electric lines are mostly made to carry electricity and might not be the best way to send data. Copper Conduct… --- ## [Why feedwater to boilers is maintained to 0ppm pure ? while we drink 80ppm impure water](https://forumautomation.com/t/why-feedwater-to-boilers-is-maintained-to-0ppm-pure-while-we-drink-80ppm-impure-water/2349)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [September 26, 2017, 12:24pm UTC](https://forumautomation.com/t/why-feedwater-to-boilers-is-maintained-to-0ppm-pure-while-we-drink-80ppm-impure-water/2349 "2017-09-26T12:24:33Z")
If someone ask you this question, while drinkable water for human being ‘needed’ 80ppm of impurity. You have to know that it is because of osmosis that we should drink 80ppm impure water, so that water can enter into our… --- ## [What is control valve timing with the advantages and disadvantages?](https://forumautomation.com/t/what-is-control-valve-timing-with-the-advantages-and-disadvantages/12822)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [November 18, 2024, 2:13pm UTC](https://forumautomation.com/t/what-is-control-valve-timing-with-the-advantages-and-disadvantages/12822 "2024-11-18T14:13:23Z")
What is control valve timing with the advantages and disadvantages? --- ## [What does LoRaWAN stand for? What is the principle of LoRaWAN?](https://forumautomation.com/t/what-does-lorawan-stand-for-what-is-the-principle-of-lorawan/12677)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [October 14, 2024, 12:50pm UTC](https://forumautomation.com/t/what-does-lorawan-stand-for-what-is-the-principle-of-lorawan/12677 "2024-10-14T12:50:46Z")
What does LoRaWAN stand for? What is the principle of LoRaWAN? --- ## [What are the benefits of tracking maintenance KPIs?](https://forumautomation.com/t/what-are-the-benefits-of-tracking-maintenance-kpis/13283)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [June 1, 2025, 11:34am UTC](https://forumautomation.com/t/what-are-the-benefits-of-tracking-maintenance-kpis/13283 "2025-06-01T11:34:44Z")
What are the benefits of tracking maintenance KPIs? --- ## [What is Protocol?](https://forumautomation.com/t/what-is-protocol/12602)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [September 20, 2024, 12:20pm UTC](https://forumautomation.com/t/what-is-protocol/12602 "2024-09-20T12:20:10Z")
What is Protocol? --- ## [What are the challenges of working in a hazardous environment?](https://forumautomation.com/t/what-are-the-challenges-of-working-in-a-hazardous-environment/11229)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 0\ **Last updated:** [June 13, 2023, 2:24pm UTC](https://forumautomation.com/t/what-are-the-challenges-of-working-in-a-hazardous-environment/11229 "2023-06-13T14:24:11Z")
Working in a hazardous environment can be challenging for a number of reasons. The following are some of the most frequently encountered challenges: Safety Risks Hazardous environments are characterized by the prese… --- ## [How to Solve Cable Tray Sagging?](https://forumautomation.com/t/how-to-solve-cable-tray-sagging/13311)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [June 20, 2025, 7:47am UTC](https://forumautomation.com/t/how-to-solve-cable-tray-sagging/13311 "2025-06-20T07:47:15Z")
How to Solve Cable Tray Sagging ? --- ## [Top 10 Temperature Measurement Interview Questions](https://forumautomation.com/t/top-10-temperature-measurement-interview-questions/12007)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [April 25, 2024, 2:50pm UTC](https://forumautomation.com/t/top-10-temperature-measurement-interview-questions/12007 "2024-04-25T14:50:45Z")
1). What is PRT? PRT is expressed as Platinum Resistance Thermometer. 2). What is the most precise type of thermocouple? Type T thermocouples have an accuracy of ±1C, followed by types J and K (±1.7C) and type N (±2.… --- ## [How do you use maintenance KPIs to improve decision-making?](https://forumautomation.com/t/how-do-you-use-maintenance-kpis-to-improve-decision-making/13284)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [June 11, 2025, 10:01am UTC](https://forumautomation.com/t/how-do-you-use-maintenance-kpis-to-improve-decision-making/13284 "2025-06-11T10:01:46Z")
How do you use maintenance KPIs to improve decision-making? --- ## [How often should a burner controller be inspected or calibrated?](https://forumautomation.com/t/how-often-should-a-burner-controller-be-inspected-or-calibrated/12340)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [August 6, 2024, 5:17pm UTC](https://forumautomation.com/t/how-often-should-a-burner-controller-be-inspected-or-calibrated/12340 "2024-08-06T17:17:51Z")
How often should a burner controller be inspected or calibrated? --- ## [What are Risk Factors? Why Risk Factors are important?](https://forumautomation.com/t/what-are-risk-factors-why-risk-factors-are-important/13333)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [June 19, 2025, 12:31pm UTC](https://forumautomation.com/t/what-are-risk-factors-why-risk-factors-are-important/13333 "2025-06-19T12:31:18Z")
What are Risk Factors? Risk factors determine the likelihood (probability) and impact of a risk. Risk factors include both Positive risks and Negative risks. Why Risk Factors are Important? Facilitate complete risk… --- ## [What is the difference between ISO 13849 and IEC 61511?](https://forumautomation.com/t/what-is-the-difference-between-iso-13849-and-iec-61511/13956)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [March 20, 2026, 4:01pm UTC](https://forumautomation.com/t/what-is-the-difference-between-iso-13849-and-iec-61511/13956 "2026-03-20T16:01:40Z")
What is the difference between ISO 13849 and IEC 61511? --- ## [Advantages and Limitations of Magnetic Flow Meters for Water and Wastewater Treatment Applications](https://forumautomation.com/t/advantages-and-limitations-of-magnetic-flow-meters-for-water-and-wastewater-treatment-applications/13168)
**Author:** [@ARTang](https://forumautomation.com/u/ARTang)\ **Replies:** 0\ **Last updated:** [April 18, 2025, 1:03am UTC](https://forumautomation.com/t/advantages-and-limitations-of-magnetic-flow-meters-for-water-and-wastewater-treatment-applications/13168 "2025-04-18T01:03:08Z")
Advantages in Water & Wastewater High Accuracy & Reliability ±0.5% accuracy for conductive liquids like drinking water, sewage, and industrial effluent. Unaffected by changes in density, viscosity, or temperature (as l… --- ## [Selection Principle of Electromagnetic Flowmeter?](https://forumautomation.com/t/selection-principle-of-electromagnetic-flowmeter/13167)
**Author:** [@ARTang](https://forumautomation.com/u/ARTang)\ **Replies:** 0\ **Last updated:** [April 18, 2025, 1:02am UTC](https://forumautomation.com/t/selection-principle-of-electromagnetic-flowmeter/13167 "2025-04-18T01:02:54Z")
Selecting an Electromagnetic Flowmeter (EMF) requires considering several factors to ensure accurate measurement, long-term reliability, and cost-effectiveness. Here are the key selection principles: Medium Characteris… --- ## [What is the purpose of an instrument index?](https://forumautomation.com/t/what-is-the-purpose-of-an-instrument-index/14282)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [July 30, 2026, 4:37am UTC](https://forumautomation.com/t/what-is-the-purpose-of-an-instrument-index/14282 "2026-07-30T04:37:39Z")
What is the purpose of an instrument index? --- ## [What Is The Difference Between Float Charger And Boost Charger In Industrial Battery Systems?](https://forumautomation.com/t/what-is-the-difference-between-float-charger-and-boost-charger-in-industrial-battery-systems/14162)
**Author:** [@ANUSHRI\_SYSTECH](https://forumautomation.com/u/ANUSHRI_SYSTECH)\ **Replies:** 0\ **Last updated:** [June 6, 2026, 5:50am UTC](https://forumautomation.com/t/what-is-the-difference-between-float-charger-and-boost-charger-in-industrial-battery-systems/14162 "2026-06-06T05:50:36Z")
Float chargers and boost chargers are both used in industrial battery charging systems, but their functions are different based on battery condition and operational requirement. A float charger is mainly used to maintai… [Previous page](https://forumautomation.com/c/interview-questions-and-answers/32.md?page=2&per_page=50)