# Instrumentation **URL:** https://forumautomation.com/c/interview-questions-and-answers/instrumentation/35.md?page=2 [Latest](https://forumautomation.com/latest.md) · [Categories](https://forumautomation.com/categories.md) · [Tags](https://forumautomation.com/tags.md) **Page:** 3 --- ## [What are the advantages and disadvantages of Cascade control?](https://forumautomation.com/t/what-are-the-advantages-and-disadvantages-of-cascade-control/1376)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [September 19, 2016, 4:00am UTC](https://forumautomation.com/t/what-are-the-advantages-and-disadvantages-of-cascade-control/1376 "2016-09-19T04:00:33Z")
Advantages of Cascade control Loop- -Isolating the slow outer loop from valve problems and some disturbances. Fast inner loop take care of these. Disadvantages of cascade control loop. -Additional measurement require… --- ## [What is Instrumentation Current loop and What are the advantages of Instrument current loop?](https://forumautomation.com/t/what-is-instrumentation-current-loop-and-what-are-the-advantages-of-instrument-current-loop/1349)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [September 14, 2016, 12:35am UTC](https://forumautomation.com/t/what-is-instrumentation-current-loop-and-what-are-the-advantages-of-instrument-current-loop/1349 "2016-09-14T00:35:24Z")
Instrumentation Current Loop (4-20 ma loops) Why to use 4-20 ma loops ? What are the advantages of 4-20 ma? The DC current loop is used extensively in the instrumentation field to transmit process variable to indica… --- ## [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 … --- ## [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… --- ## [Interview Question - What are the different types of temperature units?](https://forumautomation.com/t/interview-question-what-are-the-different-types-of-temperature-units/1295)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [August 31, 2016, 1:05am UTC](https://forumautomation.com/t/interview-question-what-are-the-different-types-of-temperature-units/1295 "2016-08-31T01:05:42Z")
Different Temperature Scales Are- Celsius - Celsius scale is developed by a Swedish astronomer Anders Celsius. By international agreement the unit degree Celsius and the Celsius scale are currently defined by two diff… --- ## [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… --- ## [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 … --- ## [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… --- ## [Interview question : Different types of calibration measurement?](https://forumautomation.com/t/interview-question-different-types-of-calibration-measurement/304)
**Author:** [@automate](https://forumautomation.com/u/automate)\ **Replies:** 0\ **Last updated:** [March 10, 2015, 7:29pm UTC](https://forumautomation.com/t/interview-question-different-types-of-calibration-measurement/304 "2015-03-10T19:29:05Z")
Different types of calibration measurement. There are three types of calibration measurement 1.Verify the performance of the test instrument 2.Adjust the response of the test instrument 3.Obtain the correction factors … --- ## [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 … --- ## [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… --- ## [Interview Question : Hazardous Area Zoning](https://forumautomation.com/t/interview-question-hazardous-area-zoning/260)
**Author:** [@automate](https://forumautomation.com/u/automate)\ **Replies:** 1\ **Last updated:** [August 4, 2016, 5:12am UTC](https://forumautomation.com/t/interview-question-hazardous-area-zoning/260 "2016-08-04T05:12:58Z")
Two types of standards are there For Europe CENELEC – in process of being transferred to IEC/EN (European Committee for Electrical Standardization) IEC (International Electrotechnical Commission) North America NEC 500… --- ## [Power Plant Instrumentation engineer Interview Question](https://forumautomation.com/t/power-plant-instrumentation-engineer-interview-question/666)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 2\ **Last updated:** [December 14, 2015, 1:39am UTC](https://forumautomation.com/t/power-plant-instrumentation-engineer-interview-question/666 "2015-12-14T01:39:47Z")
Interview Questions and Answers : Power Plant Instrumentation and Electrical Engineers Name the four major circuits in steam power plant. • Coal and ash circuit • Air and flue gas circuit • Feed water and steam circui… --- ## [Interview questions and answers - Instrumentation /Automation /Process control engineers](https://forumautomation.com/t/interview-questions-and-answers-instrumentation-automation-process-control-engineers/609)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 2\ **Last updated:** [November 27, 2015, 9:59pm UTC](https://forumautomation.com/t/interview-questions-and-answers-instrumentation-automation-process-control-engineers/609 "2015-11-27T21:59:58Z")
What does PID mean? (Be specific, don’t just define the Three Letter Acronym) Acronym: P=Proportion or gain applied to error to assist in overcoming the deviation. I= Proportion or gain over time applied to error to a… --- ## [Instrumentation Interview question : What is the difference between Transducer and Transmitter?](https://forumautomation.com/t/instrumentation-interview-question-what-is-the-difference-between-transducer-and-transmitter/248)
**Author:** [@automate](https://forumautomation.com/u/automate)\ **Replies:** 1\ **Last updated:** [March 9, 2015, 7:22pm UTC](https://forumautomation.com/t/instrumentation-interview-question-what-is-the-difference-between-transducer-and-transmitter/248 "2015-03-09T19:22:39Z")
Transducer - Transducer converts one form of energy into another form. For example : Converts mechanical energy into electrical energy. Thermocouple. Converts temperature into electrical form. Transmitter : Transmitter … [Previous page](https://forumautomation.com/c/interview-questions-and-answers/instrumentation/35.md?page=1)