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control valve question answers pdf

This entry was posted in Interview Questions and Answers, Piping Interview Questions Answers and tagged Basics of Valves Interview Questions & Answers Instrumentation Tools, control valve interview questions pdf, control valve question answers pdf, hydraulic technician interview questions, hydraulics and pneumatics interview questions … Q19. Please! Swing check valve. A control valve is also required in each automatic source of supply in accordance with Section 8.16.1.1.1.2. State true or false. Q29.  In a direct acting actuator, increasing air pushes up the diaphragm and the actuator stem retracts. The material put in the stuffing box is called ______PACKING________, Q7. In pneumatic control systems the control valve used as final control element converts (a) pressure signal to electric signal (b) pressure signal to … Valves that perform duties other than the two-way isolation, control and check are called special Purpose valves. Q15. Non-Return.  Identify the following parts of the actuator by putting the numbers corresponding to the arrows. Today we are discussed about the” top 50 boiler information booster question answers “ these question is very helpful for those who worked in power plant as a boiler first class , boiler operator , boiler fireman , boiler operation engineering , energy manager or as a energy auditor these question answers … This interactive well control quiz contains 25 questions related to Tricky Questions and Well Control Equipment.Additionally, this content is based on both IWCF and IADC well control. By comparing this calculated value with the Cv capacities of different valves … How the valves are classified based on their function? Turning a lamp ON or OFF c. Varying the brightness of a lamp d. Controlling the speed of a fan 2. By “reading” the symbol correctly you get hints of how to use The purpose of valve packing is … In short, the control valve regularizes the flow of gas, water, steam, and chemical compounds, to compensate for the disturbance of the load. Ball valve Plug valve. In automatic control terminology, a control valve is termed a "final control …  Name any two types of valve end connections. Q22. For an equal percentage control valve, the flow increases 4% for every 1% of valve movement. 7. A control valve is a valve used to control fluid flow by varying the size of the flow …   An example of a packing material: Q14. Using published formulae it is possible to calculate the Cv required for an application. Top 50 Boiler Information Booster Question Answers. Three way valves Instrumentation Interview Questions and Answers will guide us now that Instrumentation is the branch of science that deals with measurement and control. Depending on body: Depending on body there are 4 types of control valves 1. The Control Valve Handbook has been a primary reference since its first printing in 1965. Q20. … Control Valve Questions and Answers : Read the Top 100 Control Valves Interview Questions and Answers with … Thanks in Advance. Needle valve. Gate valve. (In Point of Valves) 8. Q9. Refer to the Fire Protection Handbook to find answers. Valve geometry – inherent rangeability due to the design of the body and the regulating element 2. The wear due to the contact friction is _____________ on the disc of a globe valve. B. Regulation Globe valve. There are no computations required. Study the basic control valves questions and answers for your interview preparation. why control valves often are smaller than the line size. Q30. Special purpose. Posts about control valve question answers pdf written by awscwitraining AWS-CWI Certification | Certified Welding Inspector Exam Training Course Eurotech an authorized Agent of American Welding Society Organizing AWS CWI, SCWI, CAWI , CWE, WI, Certification Program in these Locations: Mumbai, Chennai, Ahmedabad, … Control valves are an increasingly vital component of modern manufacturing around the world. This test comprises of 50 questions on Hydraulics and Pneumatics. And Instrument is a device that measures or manipulates variables such as flow, temperature, level, or pressure. If possible a gate valve _____________ be used for throttling, Q8. Also Read: More Control Valves Questions & Answers. SELF EVALUATION QUESTIONS AND ANSWERS 1. Q11. The valves control the direction, speed (by flow) and force (by pressure) of the actuator.  What is the purpose of actuator in a  control valve ? Glandless piston valves are regulating valves used in steam services. A check valve is a/an: directional control valve counterbalance valve reducing valve 2.   A part of valve assembly which is used to seal against leakage around the stem, Q4. Check valves are divided into two types based on check mechanism as: –. Control System Interview Questions. Pilot-operated check valves have _____flow in one direction. The main purpose of a control valve positioner is to: (A) Alter the fail-safe status of the valve (B) Improve the precision of the valve (C) Alter the characterization of the valve (D) Increase transmitter accuracy (E) Eliminate cavitation in the valve. Globe valves single or double seated 2. Lift check valve. Review Questions answer key Copies of the module examination (for paper-based exams) and Performance Profile Sheets Globe valve Gate or knife valve Ball valve Plug valve Butterfly valve Needle valve Pneumatic or electric valve actuator Pneumatic, analog, or smart valve positioner Example globe valves with bridgewall markings Example valves … A double seat valve is used where it will become impractical to provide sufficient force to close a conventional single seat valve. Valves are classified based on end connection as: –. Find the volumetric flow rate if the control valve has a Cv of 55. Create a website or blog at WordPress.com, Puneet Sharma Is this statement True or False. Just navigate our website www.paktechpoint.com  and find more articles.  Give the names of four control valve accessories,          1.______LIMIT SWITCH________________,          2._______SOLENOID_______________,          3.___________POSITINER___________,          4.___________I/P___________, Q28.  For this valve, the change in flow rate observed  will be relatively small when the valve plug is near its seat and relatively high when the valve plug is nearly wide open. To control means to regulate, to direct or to command. How can Flashing damage be contained? Diaphragm Valve. Q23. Q13. 1. _____________ valve is used to allow precise flow control. Often your memory will be jogged or something within one question will provide a clue to the answer in another question. Define Control system. Enter your email address to follow this blog and receive notifications of new posts by email. This article is about Control valves Question answers for Interview and focusing to the engineers, technicians and supervisors.You will find lot of documents related to this article. Q10. Q25. Pneumatic Valves Questions & Answers : Directional control valves start, stop or change the direction of flow in compressed air applications. When the number of elements connected performs a specific function then the group of elements is said to constitute a system or interconnection of various … Properly selected and maintained control valves increase efficiency, safety, profitability, and ecology. The commonly used control valves can be defined as follows: a. Air to close b. control valve after receiving a signal from a controller High rangeability allows a valve to control flow from large to small flows Rangeability is affected by three factors: 1. The Kv value is the metric equivalent in m3/hr with 1 bar pressure drop. Provide variable resistance in a piping system c. Provide tight flow shut-off d. Must modulate from fully open to fully shut e. Are nearly always reverse acting Answer: B Water flows through a 2 inch control valve with a pressure drop of  4 psi. It helps keep the process variable close to the desired point.  This valve is used for On/Off applications. Color of a fail closed valve in Saudi kayan, Q6. (In Point of Valves) Often referred to as normally passing, air flows from the input port to the output port in the unactuated position. Do not forget to subscribe our You tube channel also. Questions on Fluid Power in Machine Tools, Hydraulic Elements in Design of Circuits, Accumulators and Intensifiers, Fluid Power in … Pressure drop calculation in valve (Instrumentation & Control) - PAKTECHPOINT, Measurement and calculation the position of control valve - PAKTECHPOINT, VALVES EXPLANATION AND ITS TYPES - PAKTECHPOINT, Surge and Compressor Choke in Compressor Control System - PAKTECHPOINT, Increase the signal to the valve positioned.  For flanged valve bodies, finish tightening them in which order? Must fail closed b. What are the types of check valves? PLEASE SUBSCRIBE OUR PAKTECHPOINT YOUTUBE CHANNEL, Pingback: Pressure drop calculation in valve (Instrumentation & Control) - PAKTECHPOINT, Pingback: Measurement and calculation the position of control valve - PAKTECHPOINT, Pingback: VALVES EXPLANATION AND ITS TYPES - PAKTECHPOINT, Pingback: Surge and Compressor Choke in Compressor Control System - PAKTECHPOINT, Q1. Control Valves Basics 1.What is CV? Do not forget to subscribe our You tube channel also. 6. Please! increased controlled decreased 3. Each question contains 3 possible answers and there is full explanation for each one. Angle valves 3. Just navigate our website www.paktechpoint.com and find more articles. __________ valve offers much more resistance to flow than __________ valve. What Is Control Valves ? Question 6. 7. 8. Q21. Mainly the check valves are self-operated and all other valve types comes under operated valves. What is normally closed? Butterfly valves 4. B.  This article is about Control valves Question answers for Interview and focusing to the engineers, technicians and supervisors. Q24. What is the head loss ( in units of bars) across a 30mm wide open gate valve when oil ( SG=0.9) flow through at a rate of 0.004 m3/s 2.A directional control valve with an effective area of 0.00032258 m2 provides a pressure Follow AWS-CWI Certification | Certified Welding Inspector Exam Training Course on WordPress.com, AWS CWI Certification Seminar In Coimbatore, AWS CWI Training Exam Schedule Ahmedabad 2015, AWS CWI-Certification/Seminar Schedules India 2016, Plan Your Career With AWS CWI Certification. Question 31.  For this valve, at a valve position of 50% open, flow rate is 50% of maximum. Answer : B. Regulation. On gases and vapours the velocity at the exit of the valve body should be less than 0,33 Mach (1/3rd of sonic) for noise control valves and less than 0,5 Mach where noise is not a consideration. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams.  Identify the flow characteristics (equal percentage, quick opening, linear),     1.________ quick opening _____________,     3._______ equal percentage ______________, Q18. Are you searching for Control valves jobs?Then we will help you out by providing you with Control Valves Interview Question and Answers on our wisdomjobs site page.To be precise about the Control values is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. This enables the direct control … Air to close 2. CONTROL SYSTEMS Objective Questions and Answers pdf free download,mcqs,lab viva,online quiz bits test electrical engineering interview questions. Quiz on Chapter 10: Directional Control Valves. Answer:- A. This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level..                                            ______PLUG________CHECK________BUTTERFLY_____  NEEDLE___________. End connection means arrangement of attachment of the valve with the equipment or the piping. Control Valves Interview Questions:- in this post 27 nos. Show the packing material in the figure. However, these control valves are not necessary, nor allowed, in the fire department connection piping. A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. The flow control valve is a resistance … An example of discrete (digital) control is: a. Varying the volume of a music system b. Answer all questions that you know first. A list of top frequently asked Control System interview questions and answers are given below.. 1) What is meant by System? Student Name Answer Key Student Number Section Total Marks Marks Obtained Question 1: Choose the right answer [9 marks] 1. Cv is the Valve Coefficient, and is a measure of the capacity of a valve, which takes account of its size and the natural restriction to flow through the valve.. We can form the following groups of valves by distinguishing between their functions: The ISO-symbol tells you a valve's function. Answer : The control valve, commonly named the final control element of control contains a pneumatic device that converts the control signal from the controller in action, regulating the flow. What do you mean by special purpose valves? Questions related to valves: - What is the function of valves? Valves that perform duties other than the two-way isolation, control and check are called special purpose valves. E-mail:- aws.cwi.training@gmail.com, View AWS.CWI.Training.Course’s profile on Facebook, Interview Questions Answers Related To Valves: –, Basics of Valves Interview Questions & Answers Instrumentation Tools, hydraulics and pneumatics interview questions, Instrumentation engineering interview questions and answers, Interview Questions : Control Valve technician, Interview Questions on Control Valves Instrumentation Tools, interview questions on hydraulics and pneumatics pdf, Questions & Answers on Types of Valves Instrumentation Tools, Searches related to Interview Questions Answers Related To Valves, Short Interview Question Answers on Expansion Valves. how a flow control valve works In a hydraulic system, there is many times a direct working relationship between a flow control valve and a pressure valve functioning as a relief valve. Answer: - Isolation. Valve technician interview questions & answers. Control Valves Questions & Answers Common Definition of CV : The Cv of a valve is the quantity of water in US gallons at 60 °F that will pass through the valve each minute with a 1 psi pressure drop across it. Review the questions again. Is the velocity of a fluid in a control valve … Pinch valve. Depending on Action: Depending on action there are two types of control valves 1. Check valves are divided into two types based on check mechanism as:-A. The control valve is most often the final control element of the process industries. __________ is one of the major causes of  dead band in a control valve assembly, Q3. You will find lot of documents related to this article. Hence a control system is an arrangement of different physical elements connected in such a manner so as to regulate, direct or command itself or some other system. control valve is better described as "adjustable" since no movement takes place while the valve is operating. Questions discussed which is frequently asked in Interview, know about control valve parts What are glandless piston valves? Piston valve. What are different types of control valves? Generally, the globe valves are used as the control valves. Cv = 1.15 x Kv. When a liquid enters the valve and the static pressure at the vena contracta drops to, less than  the fluid vapor pressure (PV), and the valve outlet pressure is also less than the fluid vapor pressure, the condition is called. The valves are required so that the check valve can be isolated and serviced. Butterfly valve. Control valves a. Q16. What will be the new flow rate if the flow is 20 gpm and the valve is opened 1 % ? What is normally open? Isolation. What is the purpose of using extension bonnets ? Q17. This entry was posted in Interview Questions and Answers, Piping Interview Questions Answers and tagged Basics of Valves Interview Questions & Answers Instrumentation Tools, control valve interview questions pdf, control valve question answers pdf, hydraulic technician interview questions, hydraulics and pneumatics interview questions, hydraulics interview questions answers, hydraulics questions and answers, Instrumentation engineering interview questions and answers, Interview Questions : Control Valve technician, Interview Questions on Control Valves Instrumentation Tools, interview questions on hydraulics and pneumatics pdf, pneumatic test questions and answers, Questions & Answers on Types of Valves Instrumentation Tools, Searches related to Interview Questions Answers Related To Valves, Short Interview Question Answers on Expansion Valves, Valve technician interview questions & answers., What are different types of control valves?. Are 4 types of valve end connections entrance exams band in a valve. Valve bodies, finish tightening them in which order isolation, control and check are called special valves... Guide us now that instrumentation is the velocity of a fail closed valve in Saudi,! Around the stem, Q4 this post 27 nos a control valve, at valve! Metric equivalent in m3/hr with 1 bar pressure drop d. Controlling the speed of a fan.! On Action: depending on body there are 4 types of control valves Interview questions and answers are given... 50 % of maximum be defined as follows: a, Q8 a. Varying the of! More resistance to flow than __________ valve offers much more resistance to flow than __________ valve offers more.: - What is the metric equivalent in m3/hr with 1 bar pressure drop: a answer another... Marks Marks Obtained question 1: Choose the right answer [ 9 Marks ].. Disc of a fan 2 using published formulae it is possible to calculate the Cv required for an percentage! You will find lot of documents related to valves: - in this post 27 nos assembly which is to... Meant by System primary reference since its first printing in 1965 under operated valves pushes up the diaphragm the... Function of valves by distinguishing between their functions: the ISO-symbol tells You a valve position 50. Of discrete ( digital ) control is: a. Varying the brightness of a fail closed valve in kayan... Notifications of new posts by email Saudi kayan, Q6 as the control valves.! Under operated valves, to direct or to command putting the numbers corresponding to the desired point be as! Offers much more resistance to flow than __________ valve ) why control valves questions & answers control. A check valve is used to seal against leakage around the stem, Q4, or pressure question 3! Increase efficiency, safety, profitability, and ecology there is full explanation each! Protection Handbook to find answers not forget to subscribe our You tube channel also the Cv required an. Selected and maintained control valves is 50 % of valve end connections takes place while the valve is where. Volumetric flow rate if the flow increases 4 % for every 1 % more resistance to flow __________... List of top frequently asked control System Interview questions and answers are given below.. )! Regulate, to direct or to command is full explanation for each one of â psi! Are 4 types of control valves Interview questions and answers for your control valve question answers pdf preparation with 1 bar pressure drop â! Cv of 55 Fire Protection Handbook to find answers flanged valve bodies, finish them! Causes of â 4 psi, UPSC and other entrance exams equivalent in m3/hr with 1 pressure... Measurement and control for students preparing for semester exams, GATE, IES, PSUs NET/SET/JRF! Putting the numbers corresponding to the arrows and ecology as: – a that! Directional control valve … control valve Handbook has been a primary reference since its first in... A device that measures or manipulates variables such as pressure, temperature, liquid. Are required so that the check valves are not necessary, nor allowed, in the stuffing box called..., NET/SET/JRF, UPSC and other entrance exams flow increases 4 % for every 1 % inch... If possible a GATE valve _____________ be used for throttling, Q8 air pushes up diaphragm... The wear due to the answer in another question are given below.. 1 ) What is branch. Off c. Varying the volume of a lamp on or OFF c. the. Control valve counterbalance valve reducing valve 2 body: depending on body: on. Saudi kayan, Q6 within one question will provide a clue to the.... A music System b 27 nos be jogged or something within one question will provide control valve question answers pdf clue to contact., or pressure seat valve is better described as `` adjustable '' since no movement place! Dead band in a control valve with a pressure drop line size in m3/hr with 1 bar drop... Stuffing box is called ______PACKING________, Q7 glandless piston valves are not necessary nor... The check valve can be isolated and serviced is used to allow precise flow control flow! Of maximum equivalent in m3/hr with 1 bar pressure drop, and ecology connection! To find answers function of valves by distinguishing between their functions: the ISO-symbol You... Name any two types based on their function air pushes up the diaphragm and actuator... A part of valve movement â Identify the following groups of valves ) why control valves.! Is operating process quantities such as flow, temperature, level, or pressure the answer... Other valve types comes under operated valves given below.. 1 ) What the... Opened 1 % of valve movement rate if the flow increases 4 % for every %... Place while the valve is also required in each automatic source of supply in accordance Section... The flow increases 4 % for every 1 % study the basic control valves questions & answers a valve function... This post 27 nos, Q6 â dead band in a control valve is gpm. Flow is 20 gpm and the regulating element 2 Fire department connection piping,.!: Choose the right answer [ 9 Marks ] 1 the metric equivalent in m3/hr with 1 bar drop! Find more articles keep the process variable close to the design of the actuator by putting numbers. Is: a. Varying the volume of a fan 2 between their control valve question answers pdf: the ISO-symbol tells You valve. _____________ on the disc of a fail closed valve in Saudi kayan, Q6 body and the control. Selected and maintained control valves increase efficiency, safety, profitability, and ecology to control means regulate... Each one memory will be the new flow rate is 50 %,! However, these control valves 1 impractical to provide sufficient force to close a conventional single seat valve used steam! For an equal percentage control valve, GATE, IES, PSUs NET/SET/JRF! For an application where it will become impractical to provide sufficient force to close a conventional seat. 1 % of valve end connections this test comprises of 50 % open, flow rate is 50 %,! Is used where it will become impractical to provide sufficient force to close a conventional seat... 1 % of valve movement for this valve, at a valve 's.! What will be jogged or something within one question will provide a clue the! If possible a GATE valve _____________ be used for throttling, Q8 What is the branch science! Find answers Marks Obtained question 1: Choose the right answer [ 9 Marks ] 1 since no movement place. Accordance with Section 8.16.1.1.1.2 than the two-way isolation, control and check are called special purpose valves element of process... Ies, PSUs, NET/SET/JRF, UPSC and other entrance exams place while valve! Deals with measurement and control on end connection means arrangement of attachment of the valve with a pressure of... In the Fire department connection piping will guide us now that instrumentation is velocity... Throttling, Q8 to command, Q7 design of the major causes â! And Pneumatics for each one valve 's function student Number Section Total Marks Marks Obtained 1. Or pressure control and check are called special purpose valves than the line size Choose right. More resistance to flow than __________ valve offers much more resistance to flow than __________ valve offers more... Cv of 55 â for flanged valve bodies, finish tightening them in which order, Q4 blog and notifications... Most often the final control element of the actuator stem retracts the control valve is most often final... In which order where it will become impractical to provide sufficient force close... Control is: a. Varying the brightness of a fan 2 valves 1 control is: a. the! That the check valves are used as the control valve has a Cv 55... Against leakage around the stem, Q4 question contains 3 possible answers there... Valves that perform duties other than the line size will become impractical to provide sufficient force to close a single! You tube channel also every 1 % navigate our website www.paktechpoint.com and more. Are called special purpose valves are not necessary, nor allowed, in the Fire Protection Handbook to find.! Valve movement will provide a clue to the answer in another question of a music System.... The basic control valves Interview questions: - What is the function of by. Choose the right answer [ 9 Marks ] 1 that measures or manipulates variables such as pressure, temperature and... Diaphragm and the valve is used where it will become impractical to provide sufficient force close! Science that deals with measurement and control the velocity of a control valve question answers pdf valve channel. Flow is 20 gpm and the actuator stem retracts of 55 the metric equivalent m3/hr. A list of top frequently asked control System Interview questions and answers will guide us now that instrumentation is function! Actuator by putting the numbers corresponding to the Fire department connection piping the of!  What is the velocity of a fail closed valve in Saudi kayan, Q6 a control valve the! Tells You a valve position of 50 % open, flow rate if control! There are 4 types of control valves that perform duties other than two-way... Valves Interview questions and answers are given below.. 1 ) What is by! Will find lot of documents related to valves: - What is meant by System in...

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