Which of the following valves will incur maximum pressure drop for
the same discharge of water?
(A) Globe valve
(B) Gate valve
(C) Needle valve
(D) Butterfly valve

1 Answer

Answer :

(C) Needle valve

Related questions

Description : Remote control valve is a __________ valve. (A) Gate (B) Butterfly (C) Needle (D) Globe

Last Answer : (B) Butterfly

Description : The valve used for very remote and accurate control of fluid is a __________ valve. (A) Needle (B) Globe (C) Gate (D) Butterfly

Last Answer : (A) Needle

Description : A 2" gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is (A) Δp (B) < Δp (C) > Δp (D) Δp

Last Answer : (C) > Δp

Description : The most economical flow control valve for use with large diameter pipes is a (A) Butterfly valve (B) Globe valve (C) Needle valve (D) None of these

Last Answer : (A) Butterfly valve

Description : For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is (A) More (B) Less (C) Equal (D) Either (A) or (B); depends on the viscosity of the fluid

Last Answer : (A) More

Description : Main gas valve in a gaseous fuel burner is a __________ valve. (A) Gate (B) Butterfly (C) Globe (D) None of these

Last Answer : (A) Gate

Description : Which of the following facilitates close control of flow of fluids? (A) Gate valve (B) Globe valve (C) Butterfly valve (D) Check valve

Last Answer : (B) Globe valve

Description : The valve commonly used in pipes larger than 2" dia is a (A) Globe valve (B) Plug-cock (C) Gate valve (D) Check valve

Last Answer : (C) Gate valve

Description : Check in a centrifugal pump is (A) Provided in the discharge line (B) Generally a globe valve (C) Provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Description : For A Washout Valve Why Are Two Gate Valves Required In Normal Practice?

Last Answer : Answer : The washout valves are primarily used for normal maintenance works such as that of water main. This can be like to allow water to flow out during the cleaning of the water ... main contains water under normal operation. With two gate valves installed a leakage can be detected immediately

Description : For a given fluid flow rate, which of the following incurs maximum head loss? (A) Orificemeter (B) Venturimeter (C) Flow nozzle (D) All of them incur the same head loss

Last Answer : (A) Orificemeter

Description : how can I pin point my location on the opposite side of the world without sticking a needle through a globe?

Last Answer : answer:From Wikipedia: The antipodes of any place on the Earth is the place which is diametrically opposite it - so situated that a line drawn from the one to the other passes through the ... antipodes, this being a consequence of most land being in the northern hemisphere. Find your antipode here

Description : Where can I learn about dispensing needle valves?

Last Answer : Dispensing Needle Valves provide precise fluid dispensing. You can get more information by visiting http://process-equipment.globalspec.com and entering "Dispensing Needle Valves" in the search box.

Description : What is the use of butterfly valves ?

Last Answer : Butterfly valves are used only in systems where a small pressure drop across the valve is allowed. The butterfly is fully open when the disc rotates by 90. A drawback of this valve is that even a very small angular displacement produces a big change in flow.

Description : A globe valve is the most suitable for applications, in which (A) Fluid flow control is required (B) Fluid contains dispersed solid particles (C) Valve is required to be either fully open or fully closed (D) One way flow is required

Last Answer : (A) Fluid flow control is required

Description : Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the (A) Back flow of fluid in the event of stoppage of pump (B) Discharge pressure (C) Flow of liquid during operation of the pump (D) All (A), (B) and (C)

Last Answer : (A) Back flow of fluid in the event of stoppage of pump

Description : Purpose of relief valve in a reciprocating pump is to (A) Protect the pump against developing excessive pressure (B) Facilitate unidirectional flow of liquid (C) Reduce the discharge pressure (D) Control the rate of discharge

Last Answer : (A) Protect the pump against developing excessive pressure

Description : The vent valve provided in a liquid handling centrifugal pump is (A) Generally a needle valve (B) Used to release any gases that might be vapour locking the pump (C) Helpful in easy removal of samples (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Description : Foot valves are provided in the suction line of a centrifugal pump to (A) Avoid priming, every time we start the pump (B) Remove the contaminant present in the liquid (C) Minimise the fluctuation in discharge (D) Control the liquid discharge

Last Answer : (A) Avoid priming, every time we start the pump

Description : What are types of gate valves?

Last Answer : Answer: Solid plane wedge, solid flexible wedge, split wedge, double disc parallels seats, double disc wedge, single disc single seat gate or slide, single disc parallel seats, plug gate valve.

Description : What are port types for gate valves?

Last Answer : Answer: Full port and reduced port. Default is reduced bore. Full port has to be specified in bom.

Description : Pick up the correct statement from the following: (A) At a particular speed of operation, the head produced decreases with the increase of discharge (B) At zero discharge, discharge valve remaining closed ... which efficiency of a pump is maximum, is known as normal discharge (D) All the above

Last Answer : (D) All the above

Description : Centrifugal pumps as compared to reciprocating pumps (A) Run at a lower speed for the same discharge (B) Do not need priming (C) Deliver fluid with pulsating/fluctuating discharge (D) Can be run with discharge line valve closed for a short interval

Last Answer : (D) Can be run with discharge line valve closed for a short interval

Description : What is double disc globe valve?

Last Answer : Answer: Has two discs bearing on separate seats spaced apart, on a single shaft, for low torque, used for control valves.

Description : Where WYE body globe valve is used?

Last Answer : Answer: In line ports with stem emerging at 45 degree, for erosive fluids due to smoother flow pattern.

Description : Where plug type disc globe valve is used?

Last Answer : Answer: For severe regulating service with gritty liquids such as boiler feedwater and for blow off service.

Description : What are types of globe valve?

Last Answer : Answer: Angle globe valve, plug type disc globe valve, WYE-body globe valve, composite disc globe valve, double disc globe valve.

Description : What are characteristics of globe valve stem?

Last Answer : Answer: Always rising design, with disk nut at the lower end and handwheel at upper end.

Description : What are globe valve disk types?

Last Answer : Answer: Flat faced type for positive shutoff, loose plug type for plug renewal or needle type for finer control.

Description : What are globe valve port types?

Last Answer : Answer: Full port: More than 85% of bore size, Reducer port: One size less than the connected pipe.

Description : How to install a globe valve?

Last Answer : Answer: Globe valve should be installed such that the flow is from the underside of the disk, Usually flow direction is marked on the globe valve.

Description : Assertion `:` The opening between the right atrium and the right ventricle is guarded by a bicuspid or mitral valve. Reason `:` The valves in the hear

Last Answer : Assertion `:` The opening between the right atrium and the right ventricle is guarded by a bicuspid or ... . D. If both Assertion & Reason are false.

Description : The heart sound ‘dup’ is produced when (a) mitral valve is closed (b) semi-lunar valves at the base of aorta get closed (c) tricuspid valve is opened (d) mitral valve is opened.

Last Answer : b) semi-lunar valves at the base of aorta get closed

Description : Which of the following procedures most specifically describes splitting or separating fused cardiac valve leaflets? a) Commisurotomy Commisurotomy is frequently used for mitral stenosis. b) ... or regurgitant cardiac valve by commisurotomy, annuloplasty, leaflet repair, and/or chordoplasty.

Last Answer : a) Commisurotomy Commisurotomy is frequently used for mitral stenosis.

Description : An engine is called I or valve in head engine when a) Valve are immediately above the cylinder b) Both valves are on one side c) Both valves are on opposite direction d) None of the above

Last Answer : d) None of the above

Description : The discharge through a Venturimeter depends upon (A) Pressure drop only (B) Its orientation (C) Co-efficient of contraction only (D) None of these

Last Answer : (A) Pressure drop only

Description : Pick out the correct statement pertaining to Venturimeter. (A) A Venturimeter with a fixed pressure drop discharges more, when the flow is vertically downward, than when the flow is vertically upward (B ... , when compressibility is taken into account, than when it is neglected (D) None of these

Last Answer : (D) None of these

Description : Discharge in laminar flow through a pipe varies (A) As the square of the radius (B) Inversely as the pressure drop (C) Inversely as the viscosity (D) As the square of the diameter

Last Answer : (A) As the square of the radius

Description : In laminar flow through a round tube, the discharge varies (A) Linearly as the viscosity (B) Inversely as the pressure drop (C) Inversely as the viscosity (D) As the square of the radius

Last Answer : (C) Inversely as the viscosity

Description : What is needle valve?

Last Answer : Answer: Full pyramid disc, same design as globe valve, smaller sizes, sw or threaded, flow control, disc can be integral with stem, inside screw, borged or barstock body and bonnet, manufacturers standard.

Description : What are the advantages of butterfly valve?

Last Answer : a. Less holdup. b. No support needed. c. Any actuator can be used. d. Quick opening and closing. e. Less space required. f. Used for low-pressure low temperature and large pipelines. 

Description : What are butterfly valve types?

Last Answer : Answer: Double flange type, wafer lug type and wafer type.

Description : Which of the following pipe bends will incur the largest head loss? (A) U-bend (B) 30° bend (C) 45° bend (D) 90° bend

Last Answer : (A) U-bend

Description : How do I fix/identify a leaky brass gate valve?

Last Answer : answer:You didn't say where the leak is occurring, but I'm guessing it's in the stem under the valve handle. That's the most common place for leaking to be a problem, unless the valve itself is ... need if you show them your photo - and advise them if your system is for anything more than water.

Description : In centrifugal pump installation,  (A) Pump is properly primed before starting  (B) The diameter of the pipe at inlet as well as at outlet, is kept smaller than the delivery pipe  (C) The ... out if it is started with empty delivery pipe and with open gate valve  (D) All the above 

Last Answer : (D) All the above 

Description : How to close a gate valve?

Last Answer : Answer: Turn the hand-wheel in clockwise direction.

Description : What causes a water heaters relief valve to discharge water?

Last Answer : The relief valves are installed on every water heater for your safety. If the tank builds up too much pressure inside it can explode. The relief valve is there to relieve the pressure in the ... the tank exceeds this limit the pressure valve is activated and will relieve the pressure in the tank.

Description : One of the purposes of sub-cooling the liquid refrigerant is to (a) reduce compressor overheating (b) reduce compressor discharge temperature (c) increase cooling effect (d) ensure that only liquid and not the vapour enters the expansion (throttling) valve

Last Answer : Ans: d

Description : The higher temperature in vapour compression cycle occurs at (a) compressor discharge. (b) expansion valve (c) evaporator (d) condenser discharge

Last Answer : Ans: a

Description : Brought to mind by the flood quesion, why would anyone cancel their flood insurance to save the $800 a year cost, incur $40,000 of damage from a flood, and then not get flood insurance?

Last Answer : answer:Maybe they’re hoping that lightening won’t strike twice? You should probably tell them the same statistics do not apply to flooding and living by a river.