# Interview Q & A **URL:** https://forumautomation.com/c/interview-questions-and-answers/32.md?page=2 [Latest](https://forumautomation.com/latest.md) · [Categories](https://forumautomation.com/categories.md) · [Tags](https://forumautomation.com/tags.md) **Page:** 3 --- ## [Which communication networks can be used to transfer data between central host computer and field based RTU?](https://forumautomation.com/t/which-communication-networks-can-be-used-to-transfer-data-between-central-host-computer-and-field-based-rtu/1385)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 1\ **Last updated:** [November 15, 2016, 5:06pm UTC](https://forumautomation.com/t/which-communication-networks-can-be-used-to-transfer-data-between-central-host-computer-and-field-based-rtu/1385 "2016-11-15T17:06:00Z")
Communication networks used to transfer data between RTU and main computer are 1.Twisted Pair metallic cable 2.Coaxial metallic cable 3.Fiber optic cable 4.Power line carrier 5. Satellite 6.Leased telephone line 7.Very … --- ## [Automation engineer,DCS engineer Interview questions](https://forumautomation.com/t/automation-engineer-dcs-engineer-interview-questions/858)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [March 14, 2016, 1:08am UTC](https://forumautomation.com/t/automation-engineer-dcs-engineer-interview-questions/858 "2016-03-14T01:08:07Z")
1.Discuss the purpose and function of the four levels in a typical control system? 2.What are the functions and features of a typical dcs 3.Explain the operation and purpose of the processor in a typical programmable c… --- ## [Interview questions based on temperature measurement?](https://forumautomation.com/t/interview-questions-based-on-temperature-measurement/2458)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [October 16, 2017, 10:39am UTC](https://forumautomation.com/t/interview-questions-based-on-temperature-measurement/2458 "2017-10-16T10:39:36Z")
What are the instruments used to measure temperature? Thermometer, Thermocouple, Resistance temperature detector (RTD), Optical pyrometer, Bi-metallic temperature indicator. Choose an instrument from the following whic… --- ## [Control valve interview question and answers](https://forumautomation.com/t/control-valve-interview-question-and-answers/2540)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [October 30, 2017, 9:02pm UTC](https://forumautomation.com/t/control-valve-interview-question-and-answers/2540 "2017-10-30T21:02:49Z")
What is a valve? A valve is a device used to control the flow of fluid in a stream. What is a control valve ? A control valve changes the flow rate in the stream as a response to the controller output to change the ma… --- ## [A new software: AWA-Core](https://forumautomation.com/t/a-new-software-awa-core/12251)
**Author:** [@ForTiLab](https://forumautomation.com/u/ForTiLab)\ **Replies:** 0\ **Last updated:** [July 5, 2024, 7:23am UTC](https://forumautomation.com/t/a-new-software-awa-core/12251 "2024-07-05T07:23:12Z")
To all Automation Engineers, Instrument Specialists, Process Managers… An “historian”, a report generator, scripts, graphics, hypervision, data-loggers combined in a single Software. But also dynamic Excel tables, progr… --- ## [Electrical Interview Questions](https://forumautomation.com/t/electrical-interview-questions/929)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [March 29, 2016, 4:24am UTC](https://forumautomation.com/t/electrical-interview-questions/929 "2016-03-29T04:24:48Z")
Electrical Interview Questions 1.Transformers are used to change the value of ? Answer - Voltage 2.The path of the magnetic flux in a transformer has Answer - Low reluctance 3.The transformer is a Answer - Static d… --- ## [Industrial Automation interview questions](https://forumautomation.com/t/industrial-automation-interview-questions/748)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [January 31, 2016, 8:04pm UTC](https://forumautomation.com/t/industrial-automation-interview-questions/748 "2016-01-31T20:04:53Z")
Industrial Automation interview question 1.What are the functions and features of a typical DCS? 2.Explain the operation and purpose of the processor in a typical programmable logic controller system? 3.What are the m… --- ## [Comparison between PLC and Relay logic](https://forumautomation.com/t/comparison-between-plc-and-relay-logic/2659)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [November 16, 2017, 8:17pm UTC](https://forumautomation.com/t/comparison-between-plc-and-relay-logic/2659 "2017-11-16T20:17:42Z")
Relay logic uses relay control in electronic circuits. It is sometimes called a HARD-WIRED control system. When the control logic is installed it can only be changed manually. The relay system is still preferred in som… --- ## [Interview question - Proportional Integral Derivative controller Selection Advantages Disadvantages](https://forumautomation.com/t/interview-question-proportional-integral-derivative-controller-selection-advantages-disadvantages/431)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [May 24, 2015, 5:26pm UTC](https://forumautomation.com/t/interview-question-proportional-integral-derivative-controller-selection-advantages-disadvantages/431 "2015-05-24T17:26:56Z")
Proportional Controller Proportional controller means that the percent change in the output of the controller is some multiple of the controller of the percent change in the measurement . The multiple is called gain of … --- ## [Instrumentation Interview Question : Level Measurement](https://forumautomation.com/t/instrumentation-interview-question-level-measurement/351)
**Author:** [@automate](https://forumautomation.com/u/automate)\ **Replies:** 0\ **Last updated:** [March 24, 2015, 5:32am UTC](https://forumautomation.com/t/instrumentation-interview-question-level-measurement/351 "2015-03-24T05:32:24Z")
Q) What is level measurement ? Level measurement is the determination of the linear vertical distance between a reference point and the surface of a liquid Q)Reasons for level measurement ? Inventory Custody transfer … --- ## [What is eddy current sensor technology and its applications?](https://forumautomation.com/t/what-is-eddy-current-sensor-technology-and-its-applications/4668)
**Author:** [@rajeena](https://forumautomation.com/u/rajeena)\ **Replies:** 0\ **Last updated:** [September 17, 2018, 1:50pm UTC](https://forumautomation.com/t/what-is-eddy-current-sensor-technology-and-its-applications/4668 "2018-09-17T13:50:29Z")
What is an eddy current sensor technology and its applications? How is eddy current formed? The eddy current sensors are used to measure displacement to a nanometer. The eddy current technology uses non-contact displacem… --- ## [PID controller and tune tuning](https://forumautomation.com/t/pid-controller-and-tune-tuning/4765)
**Author:** [@cipher\_one](https://forumautomation.com/u/cipher_one)\ **Replies:** 0\ **Last updated:** [September 27, 2018, 7:38am UTC](https://forumautomation.com/t/pid-controller-and-tune-tuning/4765 "2018-09-27T07:38:31Z")
The gain of a PID controller is “1”. What is the proportional band? --- ## [Why we Measure Control Valve flow coefficient (Cv)?](https://forumautomation.com/t/why-we-measure-control-valve-flow-coefficient-cv/11957)
**Author:** [@Sundar\_Iyalunaidu](https://forumautomation.com/u/Sundar_Iyalunaidu)\ **Replies:** 1\ **Last updated:** [April 15, 2024, 12:54pm UTC](https://forumautomation.com/t/why-we-measure-control-valve-flow-coefficient-cv/11957 "2024-04-15T12:54:06Z")
Why we Measure Control Valve flow coefficient (Cv)? --- ## [HVAC interview questions](https://forumautomation.com/t/hvac-interview-questions/4363)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [August 10, 2018, 5:55pm UTC](https://forumautomation.com/t/hvac-interview-questions/4363 "2018-08-10T17:55:38Z")
1.What is HVAC system? Heating, Ventilation and Air Conditioning (HVAC) system work to maintain a controlled environment in a building. 2. What is VAV & CAV? VAV: Variable Air Volume & CAV: Constant Air Volume. 3. What… --- ## [Interview questions based on industrial automation - part 2](https://forumautomation.com/t/interview-questions-based-on-industrial-automation-part-2/2883)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [December 28, 2017, 6:16pm UTC](https://forumautomation.com/t/interview-questions-based-on-industrial-automation-part-2/2883 "2017-12-28T18:16:56Z")
For part 1: Interview questions based on industrial automation - part 1 What is a transmitter? A transmitter is a field mounted device, mounted close to the sensors. The sensor senses the physical variable in the pro… --- ## [Career prospects for an instrumentation engineer](https://forumautomation.com/t/career-prospects-for-an-instrumentation-engineer/5427)
**Author:** [@divyasree](https://forumautomation.com/u/divyasree)\ **Replies:** 0\ **Last updated:** [December 8, 2018, 1:55am UTC](https://forumautomation.com/t/career-prospects-for-an-instrumentation-engineer/5427 "2018-12-08T01:55:49Z")
After a bachelors in Instrumentation engineering there are various career options. 1. Certification courses Certificate courses are provided for a short term in PLC, SCADA Basics of Industrial automation Hydraulics and… --- ## [Why are control valves sometimes very noisy?](https://forumautomation.com/t/why-are-control-valves-sometimes-very-noisy/4569)
**Author:** [@rajeena](https://forumautomation.com/u/rajeena)\ **Replies:** 0\ **Last updated:** [September 6, 2018, 4:33pm UTC](https://forumautomation.com/t/why-are-control-valves-sometimes-very-noisy/4569 "2018-09-06T16:33:50Z")
Why are control valves sometimes very noisy? Control valves regulate flow by increasing or decreasing the fluid pressure drop across an element. These pressure drop adjustments are usually accompanied by noise generation… --- ## [Interview Questions - Instrumentation designer / instrumentation draftsman](https://forumautomation.com/t/interview-questions-instrumentation-designer-instrumentation-draftsman/664)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [December 13, 2015, 7:15am UTC](https://forumautomation.com/t/interview-questions-instrumentation-designer-instrumentation-draftsman/664 "2015-12-13T07:15:13Z")
These are the common interview question for instrumentation designer / draftsman Describe a process flow diagram and a process and instrument drawing. Draw the symbols for a gate, globe, and automatic valve. Draw the s… --- ## [Modbus RTU vs Modbus TCP](https://forumautomation.com/t/modbus-rtu-vs-modbus-tcp/12456)
**Author:** [@automation\_engineer6](https://forumautomation.com/u/automation_engineer6)\ **Replies:** 1\ **Last updated:** [September 12, 2024, 1:47pm UTC](https://forumautomation.com/t/modbus-rtu-vs-modbus-tcp/12456 "2024-09-12T13:47:58Z")
--- ## [Control valve interview questions and answers part2](https://forumautomation.com/t/control-valve-interview-questions-and-answers-part2/3446)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [April 18, 2018, 6:41pm UTC](https://forumautomation.com/t/control-valve-interview-questions-and-answers-part2/3446 "2018-04-18T18:41:03Z")
1. What are functions of valves? Isolation, regulation, non-return and special purposes 2. What are the steps in selection of valve? What to handle, liquid, gas or powder, fluid nature, function, construction materi… --- ## [What is encoder?](https://forumautomation.com/t/what-is-encoder/1357)
**Author:** [@Shaik\_Alishaheed](https://forumautomation.com/u/Shaik_Alishaheed)\ **Replies:** 1\ **Last updated:** [September 17, 2016, 2:59am UTC](https://forumautomation.com/t/what-is-encoder/1357 "2016-09-17T02:59:00Z")
Where is used encoder --- ## [Interview Questions : Process control Engineer](https://forumautomation.com/t/interview-questions-process-control-engineer/376)
**Author:** [@automate](https://forumautomation.com/u/automate)\ **Replies:** 0\ **Last updated:** [March 31, 2015, 5:21pm UTC](https://forumautomation.com/t/interview-questions-process-control-engineer/376 "2015-03-31T17:21:42Z")
Q)What does PID mean? (Be specific, don’t just define the Three Letter Acronym) Q)PID is normally used for three-mode control. What does this mean? Q)What is meant by the term setpoint? Q)What is a cascade loop? Q)What i… --- ## [What is the difference between mass flow meter and volumetric flow meter?](https://forumautomation.com/t/what-is-the-difference-between-mass-flow-meter-and-volumetric-flow-meter/8694)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [October 19, 2020, 5:05pm UTC](https://forumautomation.com/t/what-is-the-difference-between-mass-flow-meter-and-volumetric-flow-meter/8694 "2020-10-19T17:05:13Z")
Density will vary in all flow and we will not consider the variation in case of volumetric measurement. That means flow measured with static density. In mass flow measurement we will consider the density,temperature,pre… --- ## [What is the difference between single-point and multi-point calibration, and when is each appropriate to use?](https://forumautomation.com/t/what-is-the-difference-between-single-point-and-multi-point-calibration-and-when-is-each-appropriate-to-use/11304)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 0\ **Last updated:** [July 12, 2023, 8:10am UTC](https://forumautomation.com/t/what-is-the-difference-between-single-point-and-multi-point-calibration-and-when-is-each-appropriate-to-use/11304 "2023-07-12T08:10:08Z")
The two procedures used to calibrate measuring equipment and establish the relationship between measured values and instrument readings are single-point calibration and multi-point calibration. Understanding the disti… --- ## [Study guide question : viscosity](https://forumautomation.com/t/study-guide-question-viscosity/5481)
**Author:** [@ernestoec4](https://forumautomation.com/u/ernestoec4)\ **Replies:** 0\ **Last updated:** [December 13, 2018, 8:24pm UTC](https://forumautomation.com/t/study-guide-question-viscosity/5481 "2018-12-13T20:24:00Z")
viscosity is analyzed in all of the following ways? --- ## [Interview question based on PLC data communication](https://forumautomation.com/t/interview-question-based-on-plc-data-communication/2592)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [November 6, 2017, 5:45pm UTC](https://forumautomation.com/t/interview-question-based-on-plc-data-communication/2592 "2017-11-06T17:45:24Z")
What are the basic three communication levels of functionality? Device level: This level involves various sensor and actuator devices of machines and processes. Control Level: This level would be the networks industria… --- ## [Instrumentation Interview question : Vortex meters are used in which services?](https://forumautomation.com/t/instrumentation-interview-question-vortex-meters-are-used-in-which-services/267)
**Author:** [@automate](https://forumautomation.com/u/automate)\ **Replies:** 1\ **Last updated:** [November 27, 2025, 8:15am UTC](https://forumautomation.com/t/instrumentation-interview-question-vortex-meters-are-used-in-which-services/267 "2025-11-27T08:15:48Z")
Vortex meters are commonly used in following services 1.Steam 2.Cooling water 3.Process water 4.Light hydrocarbons where large turndown is required. 5.Gas flow where large turndown is required --- ## [Describe how to install electrical connections in Instrumentation and control loop systems?](https://forumautomation.com/t/describe-how-to-install-electrical-connections-in-instrumentation-and-control-loop-systems/2142)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [July 23, 2017, 11:03pm UTC](https://forumautomation.com/t/describe-how-to-install-electrical-connections-in-instrumentation-and-control-loop-systems/2142 "2017-07-23T23:03:44Z")
Process control depends on the integrity of communication between instruments,information travels through the loop and signals which represents the value of the process variable or the output of the controller. These sig… --- ## [Interview question based on Industrial automation - part1](https://forumautomation.com/t/interview-question-based-on-industrial-automation-part1/2872)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [December 25, 2017, 7:01pm UTC](https://forumautomation.com/t/interview-question-based-on-industrial-automation-part1/2872 "2017-12-25T19:01:52Z")
What is industrial automation? Industrial automation is the use of control system such as the computer to control industrial machinery and processes, replacing human operator. What are the most commonly used control… --- ## [What is a system in Process Control?](https://forumautomation.com/t/what-is-a-system-in-process-control/2742)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [November 28, 2017, 9:40pm UTC](https://forumautomation.com/t/what-is-a-system-in-process-control/2742 "2017-11-28T21:40:56Z")
The controlled system has an input variable and an output variable. Its response is described in terms of the dependence of the output variable on the input variable. These responses between one or several variables can … --- ## [What is Benchset and Stroking](https://forumautomation.com/t/what-is-benchset-and-stroking/3052)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [January 29, 2018, 7:25pm UTC](https://forumautomation.com/t/what-is-benchset-and-stroking/3052 "2018-01-29T19:25:47Z")
Benchset: Benchset are the actual pressure ranges for travel of the actuator with no friction. These are the actual maximum and minimum pressures that move the actuator from end to end of its range of operation. This i… --- ## [Flex feeder vibration for movement position and displacement](https://forumautomation.com/t/flex-feeder-vibration-for-movement-position-and-displacement/8965)
**Author:** [@ricardo1998](https://forumautomation.com/u/ricardo1998)\ **Replies:** 0\ **Last updated:** [December 15, 2020, 6:53pm UTC](https://forumautomation.com/t/flex-feeder-vibration-for-movement-position-and-displacement/8965 "2020-12-15T18:53:08Z")
How does the flex feeder vibration to move and control de position of differentes componentes or pieces is made? --- ## [What is the meaning of Explosion proof? What is the difference between explosion proof and intrinsic safety?](https://forumautomation.com/t/what-is-the-meaning-of-explosion-proof-what-is-the-difference-between-explosion-proof-and-intrinsic-safety/1691)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [January 21, 2017, 5:19pm UTC](https://forumautomation.com/t/what-is-the-meaning-of-explosion-proof-what-is-the-difference-between-explosion-proof-and-intrinsic-safety/1691 "2017-01-21T17:19:16Z")
Explosion Proof- Equipment with an explosion proof classification doesn’t mean the equipment will survive an explosion.Instead it means that the equipment is housed or has an enclosure which prevents an internal spark f… --- ## [What is maintenance?](https://forumautomation.com/t/what-is-maintenance/2694)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [November 21, 2017, 7:59pm UTC](https://forumautomation.com/t/what-is-maintenance/2694 "2017-11-21T19:59:11Z")
Maintenance refers to all measures regarding the preservation and re-establishing of the setpoint status and the determining and evaluation of the actual state of technical resources of the system. The process of mainte… --- ## [What is PID controller vs MPC controller?](https://forumautomation.com/t/what-is-pid-controller-vs-mpc-controller/12805)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [November 12, 2024, 1:56pm UTC](https://forumautomation.com/t/what-is-pid-controller-vs-mpc-controller/12805 "2024-11-12T13:56:31Z")
What is PID controller vs MPC controller? --- ## [Interview Question : Instrumentation - How to Categorize flow measurement](https://forumautomation.com/t/interview-question-instrumentation-how-to-categorize-flow-measurement/407)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [April 23, 2015, 9:06pm UTC](https://forumautomation.com/t/interview-question-instrumentation-how-to-categorize-flow-measurement/407 "2015-04-23T21:06:36Z")
Flow Measurement - Main Classification Displacement Constriction Type (Differential Head) 3.Velocity Flow Meters 4.Mass flow meters Different types of displacement type flow meters are a. Positive displacement meters… --- ## [Fundamentals of Multivariable Measurement?](https://forumautomation.com/t/fundamentals-of-multivariable-measurement/1612)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [January 1, 2017, 5:46pm UTC](https://forumautomation.com/t/fundamentals-of-multivariable-measurement/1612 "2017-01-01T17:46:55Z")
What is Multivariable measurement ? Measuring multiple process variable in one instrument in order to accurately measure volume as well as mass flow through appropriate flow compensation. Flow compensation is divided u… --- ## [What is Intrinsically safe?](https://forumautomation.com/t/what-is-intrinsically-safe/1690)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [January 21, 2017, 5:04pm UTC](https://forumautomation.com/t/what-is-intrinsically-safe/1690 "2017-01-21T17:04:45Z")
Intrinsically Safe A design technique to limit energy (electrical and/or thermal) below a level required to ignite a specific hazardous atmospheric mixture. Why intrinsic safe is important? This technique is important… --- ## [Industrial Network interview questions](https://forumautomation.com/t/industrial-network-interview-questions/3597)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [May 10, 2018, 5:20pm UTC](https://forumautomation.com/t/industrial-network-interview-questions/3597 "2018-05-10T17:20:20Z")
What is MAC Address? A unique48 Bit address assigned to each network card. Its also called as a physical address. What is meant by Hubs? A common connection point for devices in a network. Hubs are commonly used to conn… --- ## [Bharath Petroleum Hindustan Petroleum ONGC Indian Oil NTPC QUESTION PAPER FOR ELECTRICAL AND INSTRUMENTATION CANDIDATE](https://forumautomation.com/t/bharath-petroleum-hindustan-petroleum-ongc-indian-oil-ntpc-question-paper-for-electrical-and-instrumentation-candidate/252)
**Author:** [@automate](https://forumautomation.com/u/automate)\ **Replies:** 0\ **Last updated:** [February 20, 2015, 6:13am UTC](https://forumautomation.com/t/bharath-petroleum-hindustan-petroleum-ongc-indian-oil-ntpc-question-paper-for-electrical-and-instrumentation-candidate/252 "2015-02-20T06:13:21Z")
QUESTION PAPER PAER FOR THE ELECTRICAL AND INSTRUMENTATION CANDIDATE What is the supply frequency in India? a) 60HZ b) 55HZ c) 50HZ e) 40HZ What will be the total resistance in a parallel circuit? a) Higher than … --- ## [Emergency stop, solenoid automation, looking for advise](https://forumautomation.com/t/emergency-stop-solenoid-automation-looking-for-advise/1513)
**Author:** [@Viking](https://forumautomation.com/u/Viking)\ **Replies:** 0\ **Last updated:** [November 20, 2016, 3:44pm UTC](https://forumautomation.com/t/emergency-stop-solenoid-automation-looking-for-advise/1513 "2016-11-20T15:44:22Z")
Trying to find solution to a challenge connected to a remote emergency stop of marine diesel engines; I need to activate the stop solenoid for long enough time to stop the engine, but immediately after the engine stop, … --- ## [Safety realys for use in high altitudes](https://forumautomation.com/t/safety-realys-for-use-in-high-altitudes/2275)
**Author:** [@Okal](https://forumautomation.com/u/Okal)\ **Replies:** 0\ **Last updated:** [September 5, 2017, 6:44pm UTC](https://forumautomation.com/t/safety-realys-for-use-in-high-altitudes/2275 "2017-09-05T18:44:18Z")
Does anybody know any Safety relay (for connection of Emergency stop), taht is certified for use in high altitude, for example 4.000m.? --- ## [How to adjust 20 psi air supply to a transmitter?](https://forumautomation.com/t/how-to-adjust-20-psi-air-supply-to-a-transmitter/11183)
**Author:** [@Sudha\_m](https://forumautomation.com/u/Sudha_m)\ **Replies:** 0\ **Last updated:** [May 22, 2023, 3:52pm UTC](https://forumautomation.com/t/how-to-adjust-20-psi-air-supply-to-a-transmitter/11183 "2023-05-22T15:52:51Z")
The general stages of adjusting a 20 psi (pounds per square inch) air supply to a transmitter are as follows: Determine the pressure adjustment mechanism: A pressure regulator or control valve are common pressure adju… --- ## [What is an Imperial System of UNITS?](https://forumautomation.com/t/what-is-an-imperial-system-of-units/2226)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [August 20, 2017, 6:07pm UTC](https://forumautomation.com/t/what-is-an-imperial-system-of-units/2226 "2017-08-20T18:07:01Z")
Imperial System of UNITS In the imperial system the base quantities are length with units in inches,feet,yards and miles,time with units same as in SI in seconds (s),hours (hr), days (d),weeks and year. Weight with unit… --- ## [What is RS-485, and why is it commonly used in industrial applications?](https://forumautomation.com/t/what-is-rs-485-and-why-is-it-commonly-used-in-industrial-applications/12721)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [October 25, 2024, 4:36am UTC](https://forumautomation.com/t/what-is-rs-485-and-why-is-it-commonly-used-in-industrial-applications/12721 "2024-10-25T04:36:27Z")
What is RS-485, and why is it commonly used in industrial applications? --- ## [What is the function of starter in tube light circuit?](https://forumautomation.com/t/what-is-the-function-of-starter-in-tube-light-circuit/12152)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 1\ **Last updated:** [July 9, 2024, 3:40am UTC](https://forumautomation.com/t/what-is-the-function-of-starter-in-tube-light-circuit/12152 "2024-07-09T03:40:50Z")
Function of Starter in Tube Light Circuit In a tube light circuit, the starter is an important component that helps the fluorescent lamp start up. It has the following functions: Heat the Filaments When you turn on … --- ## [Transformer Interview Questions](https://forumautomation.com/t/transformer-interview-questions/13074)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [March 11, 2025, 5:24am UTC](https://forumautomation.com/t/transformer-interview-questions/13074 "2025-03-11T05:24:06Z")
Collection of Top 10 Transformer Interview Questions In electrical engineering job interviews, transformer interview questions are frequently asked, particularly for positions that involve the operation, testing, and m… --- ## [What is the difference between zero trim and sensor trim?](https://forumautomation.com/t/what-is-the-difference-between-zero-trim-and-sensor-trim/13362)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [July 19, 2025, 5:37am UTC](https://forumautomation.com/t/what-is-the-difference-between-zero-trim-and-sensor-trim/13362 "2025-07-19T05:37:00Z")
What is the difference between zero trim and sensor trim? --- ## [Instrumentation Interview Question : Indicative range of pressure measuring Instruments?](https://forumautomation.com/t/instrumentation-interview-question-indicative-range-of-pressure-measuring-instruments/437)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [May 31, 2015, 8:57am UTC](https://forumautomation.com/t/instrumentation-interview-question-indicative-range-of-pressure-measuring-instruments/437 "2015-05-31T08:57:13Z")
Below 1 mm of Hg Manometer and low pressure gauges Between 1 mm of Hg to 1000 atm Bordon tube -Diaphragm gages -Bellows 3)High Vaccum -McLeod Gage -Thermal Conductivity gage -Ionization gage 4)High pressure (1… --- ## [What are the IEE Regulations for Electrical Installation?](https://forumautomation.com/t/what-are-the-iee-regulations-for-electrical-installation/12154)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [June 11, 2024, 1:37pm UTC](https://forumautomation.com/t/what-are-the-iee-regulations-for-electrical-installation/12154 "2024-06-11T13:37:57Z")
IEE Regulations for Electrical Installation The IEE (Institution of Electrical Engineers) Wiring Regulations, commonly known as BS 7671, are the UK’s electrical installation standards, which are maintained by the Institu… [Previous page](https://forumautomation.com/c/interview-questions-and-answers/32.md?page=1&per_page=50) [Next page](https://forumautomation.com/c/interview-questions-and-answers/32.md?page=3&per_page=50)