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