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