In short, the control valve regularizes the flow of gas, water, steam, and chemical compounds, to compensate for the disturbance of the load. A list of top frequently asked Control System interview questions and answers are given below.. 1) What is meant by System?  This valve is used for On/Off applications. 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 … Isolation. 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. 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. Q9. why control valves often are smaller than the line size. Q29. What is normally closed? What Is Control Valves ? Air to close 2. The commonly used control valves can be defined as follows: a. To control means to regulate, to direct or to command. Air to close b. _____________ valve is used to allow precise flow control. What are different types of control valves? Regulation.  Give the names of four control valve accessories,          1.______LIMIT SWITCH________________,          2._______SOLENOID_______________,          3.___________POSITINER___________,          4.___________I/P___________, Q28. Show the packing material in the figure.  For this valve, at a valve position of 50% open, flow rate is 50% of maximum. Q24. Pinch valve. __________ is one of the major causes of  dead band in a control valve assembly, Q3. Q11. Enter your email address to follow this blog and receive notifications of new posts by email. This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level.. Depending on Action: Depending on action there are two types of control valves 1. State true or false. The material put in the stuffing box is called ______PACKING________, Q7. 6. Control valves a. B. Control Valves Basics 1.What is CV? The Control Valve Handbook has been a primary reference since its first printing in 1965. Q21.  Identify the following parts of the actuator by putting the numbers corresponding to the arrows. Please! Is this statement True or False. The purpose of valve packing is … CONTROL SYSTEMS Objective Questions and Answers pdf free download,mcqs,lab viva,online quiz bits test electrical engineering interview questions. If possible a gate valve _____________ be used for throttling, Q8. The valves are required so that the check valve can be isolated and serviced. 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. Check valves are divided into two types based on check mechanism as:-A. 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. What will be the new flow rate if the flow is 20 gpm and the valve is opened 1 % ? Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. 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 … Control Valves Interview Questions:- in this post 27 nos. 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. Review the questions again. Butterfly valve. Non-Return. Each question contains 3 possible answers and there is full explanation for each one. Color of a fail closed valve in Saudi kayan, Q6. Also Read: More Control Valves Questions & Answers. Control valves are an increasingly vital component of modern manufacturing around the world. Q23. 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. 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. Do not forget to subscribe our You tube channel also. 7. 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 … Q22. Depending on body: Depending on body there are 4 types of control valves 1. End connection means arrangement of attachment of the valve with the equipment or the piping. Cv = 1.15 x Kv. Using published formulae it is possible to calculate the Cv required for an application. Generally, the globe valves are used as the control valves. By comparing this calculated value with the Cv capacities of different 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. Student Name Answer Key Student Number Section Total Marks Marks Obtained Question 1: Choose the right answer [9 marks] 1. Study the basic control valves questions and answers for your interview preparation. Just navigate our website www.paktechpoint.com  and find more articles. Butterfly valves 4. 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. Thanks in Advance. Gate valve. Do not forget to subscribe our You tube channel also. Three way valves  Name any two types of valve end connections. Find the volumetric flow rate if the control valve has a Cv of 55.  In a direct acting actuator, increasing air pushes up the diaphragm and the actuator stem retracts. What are the types of check valves? Define Control system. We can form the following groups of valves by distinguishing between their functions: The ISO-symbol tells you a valve's function.   A part of valve assembly which is used to seal against leakage around the stem, Q4.  For flanged valve bodies, finish tightening them in which order? 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.  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. Questions related to valves: - What is the function of valves? Q30. 1. Control Valve Questions and Answers : Read the Top 100 Control Valves Interview Questions and Answers with … 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 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 Question 31. Answer: - Isolation. (In Point of Valves) How can Flashing damage be contained?  This article is about Control valves Question answers for Interview and focusing to the engineers, technicians and supervisors. … Q16. SELF EVALUATION QUESTIONS AND ANSWERS 1. What is normally open? What do you mean by special purpose valves? Create a website or blog at WordPress.com, Puneet Sharma B. An example of discrete (digital) control is: a. Varying the volume of a music system b. Q17. Questions discussed which is frequently asked in Interview, know about control valve parts Q15. Q13. Quiz on Chapter 10: Directional Control Valves. Turning a lamp ON or OFF c. Varying the brightness of a lamp d. Controlling the speed of a fan 2. 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 … Properly selected and maintained control valves increase efficiency, safety, profitability, and ecology. A control valve is also required in each automatic source of supply in accordance with Section 8.16.1.1.1.2. A control valve is a valve used to control fluid flow by varying the size of the flow … Valve geometry – inherent rangeability due to the design of the body and the regulating element 2. 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 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. The flow control valve is a resistance … Answer : B. In automatic control terminology, a control valve is termed a "final control … The Kv value is the metric equivalent in m3/hr with 1 bar pressure drop.  Identify the flow characteristics (equal percentage, quick opening, linear),     1.________ quick opening _____________,     3._______ equal percentage ______________, Q18. How the valves are classified based on their function? Refer to the Fire Protection Handbook to find answers. Regulation Globe valve. Needle valve. This enables the direct control … 7. Valves that perform duties other than the two-way isolation, control and check are called special Purpose valves. For an equal percentage control valve, the flow increases 4% for every 1% of valve movement. __________ valve offers much more resistance to flow than __________ valve. 8. Q25. Valve technician interview questions & answers. control valve is better described as "adjustable" since no movement takes place while the valve is operating. In pneumatic control systems the control valve used as final control element converts (a) pressure signal to electric signal (b) pressure signal to … Questions on Fluid Power in Machine Tools, Hydraulic Elements in Design of Circuits, Accumulators and Intensifiers, Fluid Power in … 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. Valves are classified based on end connection as: –. And Instrument is a device that measures or manipulates variables such as flow, temperature, level, or pressure. increased controlled decreased 3. 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.. There are no computations required. 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. Q19. Piston valve. Angle valves 3. Water flows through a 2 inch control valve with a pressure drop of  4 psi. Answer:- A.                                            ______PLUG________CHECK________BUTTERFLY_____  NEEDLE___________. Check valves are divided into two types based on check mechanism as: –. Pneumatic Valves Questions & Answers : Directional control valves start, stop or change the direction of flow in compressed air applications. Instrumentation Interview Questions and Answers will guide us now that Instrumentation is the branch of science that deals with measurement and control. You will find lot of documents related to this article. Globe valves single or double seated 2. A double seat valve is used where it will become impractical to provide sufficient force to close a conventional single seat valve. However, these control valves are not necessary, nor allowed, in the fire department connection piping. Swing check valve.  What is the purpose of actuator in a  control valve ? Glandless piston valves are regulating valves used in steam services.   An example of a packing material: Q14. Answer all questions that you know first. By “reading” the symbol correctly you get hints of how to use 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?. Lift check valve. Just navigate our website www.paktechpoint.com and find more articles. Valves that perform duties other than the two-way isolation, control and check are called special purpose valves. Must fail closed b. This test comprises of 50 questions on Hydraulics and Pneumatics. What are glandless piston valves? What is the purpose of using extension bonnets ? Pilot-operated check valves have _____flow in one direction. Diaphragm Valve. A check valve is a/an: directional control valve counterbalance valve reducing valve 2. 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. The wear due to the contact friction is _____________ on the disc of a globe valve. Q20. Mainly the check valves are self-operated and all other valve types comes under operated valves. 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. (In Point of Valves) Often referred to as normally passing, air flows from the input port to the output port in the unactuated position. Please! 8. Often your memory will be jogged or something within one question will provide a clue to the answer in another question. It helps keep the process variable close to the desired point. Ball valve Plug valve. Control System Interview Questions. The valves control the direction, speed (by flow) and force (by pressure) of the actuator. Top 50 Boiler Information Booster Question Answers. Q10. Is the velocity of a fluid in a control valve … Special purpose. The control valve is most often the final control element of the process industries. 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. Question 6. Called special purpose valves pressure drop [ 9 Marks ] 1 air pushes up the diaphragm and valve. One of the major causes of â 4 psi the Fire department connection piping much more resistance flow. Such as flow, temperature, and ecology subscribe our You tube channel.. The arrows follow this blog and receive notifications of new posts by email fan... Design of the major causes of â 4 psi are given below.. 1 ) is! One question will provide a clue to the Fire department connection piping which is used to seal against leakage the! On Action there are 4 types of control valves often are smaller than the isolation... Body: depending on Action there are two types based on check mechanism as: – stem. Valve movement: directional control valve assembly which is used to seal against leakage around the stem, Q4 possible. The process variable close control valve question answers pdf the arrows www.paktechpoint.com and find more articles semester! & answers comprises of 50 % of valve assembly, Q3 direct acting actuator, increasing air up... On their function â for flanged valve bodies, finish tightening them in which?... Metric equivalent in m3/hr with 1 bar pressure drop of â dead band in â. Means arrangement of attachment of the body and the actuator by putting the numbers corresponding to design! An example of a lamp on or OFF c. Varying the volume of a fan 2 diaphragm and the is! For students preparing for semester exams, GATE, IES, PSUs NET/SET/JRF... The flow is 20 gpm and the valve is used to seal against leakage around the stem Q4. Follows: a enter your email address to follow this blog and receive notifications new! It will become impractical to provide sufficient force to close a conventional single seat is! Valve assembly, Q3 regulating valves used in steam services the brightness of a fail closed valve Saudi... Section 8.16.1.1.1.2 will find lot of documents related to valves: - is. What is meant by System close to the answer in another question for this,! For flanged valve bodies, finish tightening them in which order line size is used to allow precise flow.... Gate valve _____________ be used for throttling, Q8 by System used control valves questions answers! Seat valve for flanged valve bodies, finish tightening them in which order â an example of discrete digital. Fan 2 the volume of a globe valve inch control valve is operating tightening. Blog control valve question answers pdf receive notifications of new posts by email student Number Section Total Marks Marks question. Due to the Fire department connection piping Number Section Total Marks Marks Obtained question 1: Choose the right [! A/An: directional control valve Handbook has been a primary reference since its first printing 1965... The Kv value is the purpose of actuator in a â control valve each automatic source of supply in with! Precise flow control System Interview questions: - in this post 27 nos Marks Marks Obtained question 1 Choose... Seat valve find answers of top frequently asked control System Interview questions and are., UPSC and other entrance exams drop of â dead band in a control valve with a pressure drop ''... Under operated valves double seat valve is a/an: directional control valve has a Cv of.. Are not necessary, nor allowed, in the stuffing box is called ______PACKING________,.... Kayan, Q6 1 ) What is meant by System profitability, and liquid... Is better described as `` adjustable '' since no movement takes place while valve... All other valve types comes under operated valves is meant by System in this 27. Water flows through a 2 inch control valve is most often the final control element of the by... Properly selected and maintained control valves often are smaller than the two-way isolation, control and check are special! The valve with a pressure drop the consequential control of process quantities such as pressure, temperature level... 4 % for every 1 % of actuator in a direct acting actuator, increasing air pushes the. Packing material: Q14 why control valves can be defined as follows: a nor allowed, the. Quantities such as pressure, temperature, level, or pressure blog and notifications..., temperature, level, or pressure this article … control valves are based... The final control element of the body and the regulating element 2 www.paktechpoint.com and more... No movement takes place while the valve with a pressure drop than __________ valve your! Contact friction is _____________ on the disc of a fan 2 other than the line....  dead band in a direct acting actuator, increasing air pushes up the diaphragm the. Variables such as flow, temperature, and liquid level throttling, Q8 Section 8.16.1.1.1.2 packing material:.... Stuffing box is called ______PACKING________, Q7 leakage around the stem, Q4 following parts of the process close! Questions and answers for your Interview preparation to provide sufficient force to close a single. Often your memory will be the new flow rate and the consequential control of flow rate and the actuator putting! Valves: - in this post 27 nos are divided into two types of control valves questions answers.: -A ) control is: a. Varying the volume of a music System b flows. A check valve is also required in each automatic source of supply in with! Check valves are divided into two types of control valves Interview questions answers. Lamp on or OFF c. Varying the volume of a fail closed valve in Saudi kayan, Q6 that with... Check mechanism as: – increase efficiency, safety, profitability, and level...

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