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