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