Explanation: By expanding the refrigerant very close to the saturated liquid state refrigeration effect can be improved.And if the refrigerant is compressed very near to the saturated vapour line by using compression in more stages, overall work can be reduced. 3. 11. A Centrifugal pump is a rotary machine that converts mechanical energy or kinetic energy into pressure energy or pressure head by means of centrifugal force, is known as a centrifugal pump. 8. Rewriting it is the actual answer. 1. They are applied when higher pumping pressures are required for conveying pure or slightly contaminated liquids. Less than the vapour pressure of the liquid at that temperature B. This pressure increase can be anywhere from several dozen to several hundred psid across a centrifugal pump with a single stage impeller. Image 1. 15. Examveda In a centrifugal pump, the liquid enters the pump A. D 2 C. D 3 D. 1/D 3 E. 1/D 2 View Answer Your Comments 12. The centrifugal pump claims to have following advantages over positive displacement also called reciprocating pump. Standard centrifugal pumps based on ISO733 (DIN24255) Enquire. a. pressure energy b. kinetic energy The centrifugal pump casing is the component of the pump that converts all of the velocity created by the rotating impeller into a controlled and stable flow and directs it out of the pump through the discharge point. c) Air lift pump. Steady CENTRIFUGAL PUMPS. In this case, the bearing can belong to the wet end. Because of fewer parts centrifugal pump have less cost than reciprocating pump. Centrifugal pumps are the most economical and most common pumps used for pumping water in industrial applications. It delivered 1.2 m 3 /minute against a head of 25m. Turbines and compressors work with the gas, while centrifugal pump transfers energy. Centrifugal pumps are used for bilge pumping, fire fighting, water supply, and fuel transfer tasks. Turbomachines are machines that transfer energy between a rotor and a fluid, including both turbines and compressors. Answer: d. Clarification: There are 3 types of pumps on the basis of type of power. Search result of "Centrifugal pumps examveda" Search By Products. Environmental Engineering Multiple Choice Questions on "Centrifugal Pump". A centrifugal pump has an impeller of 30cm diameter and runs at 1000 rpm giving best efficiency. Centrifugal pump engineers are familiar with selecting pumps from a performance range using performance curves that map the operating range. maintenance, and troubleshooting of centrifugal pumps. KNOWLEDGE: K1.01 [3.3/3.5] QID: P21 . Answer (1 of 6): Actually, you have stated the question backwards. Which of the following centrifugal pumps has higher specific speed than the others? All work in a slightly different way, but ultimately they all do the same thing . Sometimes the first radial bearing can be water-filled. Q1. Their components are rotating components, an impeller coupled to a shaft, and stationary components, casing, casing cover, and bearings. Low flow rate with low discharge pressure. The efficiency of a pump is generally less than that of a turbine. Home / Chemical Engineering / Fluid Mechanics / Question Examveda A centrifugal pump designed for handling water ( = 1 cp) will deliver __________ when pumping a thicker oil ( = 30 cp). 4.1.1 Centrifugal Pumps. Centrifugal pumps are provided with packing rings or mechanical seal, which helps prevent the leakage of the pumped liquid. In centrifugal pumps, cavitation results from a reduction in suction pressure, an increase in suction temperature, or an increase in the flow rate above that for which the pump has been designed. Radial flow c. Mixed flow d. All have same specific speed Answer Explanation 2) Pump transfers the mechanical energy of a motor or of an engine into _________ of a fluid. The most common pump used for hydraulic fluid power application is _____ At the bottom C. At the canter D. From sides Answer: Option C Click here to read 1000+ Related Questions on Hydraulics and Fluid Mechanics in ME (Mechanical Engineering) A flow in which the quantity of liquid flowing per second is constant, is called __________ flow. A booster pump is based on _____________. Why is multistage compression used Mcq? 2. ; Related Documents . Discharge of a centrifugal pump is proportional to A. Impeller diameter (D) B. It is a mechanical device. Provided in the discharge line B. With the centrifugal pump operating at constant speed, when the head decreases the flow rate increases. ; Condensate Pumping - High temperatures and danger of impeller cavitation is the major challenge for condensate pumping in steam systems. A) The fire hose is replaced with a 6-inch diameter fire hose. A Centrifugal pump is a mechanical machine that pumps the fluids by converting the mechanical power (rotational energy) into the pressure energy of the fluid flow. Which one of the following will cause the pump to operate at shutoff head? Dimensionless pressure rise is not dependent on which of the following? Collecting Cheques/Drafts customers C. Facilitating import of goods D. Issuing Bank Drafts View Answer Which type of vanes is suitable for high speed runners? Can you explain this answer? Less head & capacity B. Answer: Centrifugal pump is a kinetic device. Turbomachines work under ________. This mechanical power generally supplies by the electric motor or engine. High discharge B. In addition, these pumps are often used to create a vacuum environment within a ship's hull during construction or repairs. Pumps -1- TOPIC: 191004 . Answer: a. Clarification: Centrifugal pump is a turbomachinery. A reciprocating pump's flow is determined by the volume of its cylinders and the rate at which the piston can move fluid through into the system. Enquire. Enquire. 2. The term PSID (Pounds Force Per Square Inch Differential) is equivalent to P. 250+ TOP MCQs on Pumps and Answers Dairy Engineering Multiple Choice Questions on "Pumps". The pump preferred to be used for pumping highly viscous fluids belongs to the category ofa)screw pumpb)turbine pumpc)plunger pumpd)centrifugal pumpCorrect answer is option 'C'. A. a) Low lift pump. There are at least 5 common types of bearing, each of which operates on different principles: Liquid enters the pump suction nozzle. Pump curves are plotted with head pressure as the ordinate (Y Axis) and the flow rate as th. Enquire. Check in a centrifugal pump is Home / Chemical Engineering / Fluid Mechanics / Question Examveda Check in a centrifugal pump is A. 1. Semi-centrifugal casting A. Centrifugal pumps. Centrifugal pumps can also be used to transfer sewage and other waste materials from one location to another. Also, these are belt driven to facilitate changes in the speed. It enters inside the rotating impeller vane through the eye. Bearings constrain the relative motion of the shaft (rotor) and reduce friction between the rotating shaft and the stator. The maximum pressure that could be achieved is usually sufficiently low such that a pressure relief valve is not required. Pumps - Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more. Solution(By Examveda Team) . The wet end parts of the pump include those that provide the hydraulic performance of the pump: the impeller and the casing. mcq on centrifugal pump, centrifugal pump mcq questions, hydraulic machines mcq in hindiRAC MCQ-https://youtube.com/playlist?list=PLbkIghvjQ7P_cHno9NE3eJ3uNQ. Any comments or queries are most welcome. Centrifugal pumps are a sub class of dynamic axisymmetric work absorbing turbomachinery. A variable-speed centrifugal fire water pump is taking a suction on an open storage tank and discharging through a 4-inch diameter fire hose and through a nozzle located 50 feet above the pump. Whereas reciprocating pumps are suitable for less discharge with a high head. a) Axial flow b) Radial flow c) Mixed flow d) All centrifugal pumps have same specific speed Answer: a The impeller in the volute pump is surrounded by _____________. Directly proportional to diameter of its impeller B. Inversely proportional to diameter of its impeller C. Directly proportional to (diameter) 2 of its impeller Bearings. The main parts of centrifugal pumps can be divided into the wet end and the mechanical end. Centrifugal pump has more weight due to a given discharge. a) To improve C.O.P. There are two basic types of pump cavitation: Suction Cavitation 9. Discharge of a centrifugal pump is Home / Mechanical Engineering / Hydraulics And Fluid Mechanics In ME / Question Examveda Discharge of a centrifugal pump is A. b) High lift pump. D. High motor amps with high discharge pressure. d) Steam engine pump. At the top B. Related Topics . 7. A Forward facing vanes B Radial vanes C Backward facing vanes D None of the above Q3. In simple understanding, A pump is required to transfer liquid from an area or a place to another place. A. a) Newtons first law. The most common type of casing is called a volute and it looks similar to a snail shell. a) Density of the fluid b) Speed of the blower 10. Home / Chemical Engineering / Fluid Mechanics / Question Examveda Cavitation occurs in a centrifugal pump when the suction pressure is A. Which one of the following contains indications of cavitation in an operating centrifugal pump? Casting objective questions (mcq) and answers - MechanicalTutorial Casting - Casting objective questions and answers 1. So the liquid entering the pump receives kinetic energy from the rotating impeller. Normally, a centrifugal pump produces a relatively low pressure increase in the fluid. The article has been written keeping in mind the level and interests of students and the beginners in operation. Also because of fewer parts installation and maintenance are easier and cheaper as compared to reciprocating pump. Clarification: Centrifugal pump action is characterized by the pump performance curve upper curve of the graph on the right. Process centrifugal pumps - single stage, based on ISO 5199, ISO 2858. Is used to cast symmetrical objects C. Is used to obtain high density and pure casting A centrifugal pump designed for handling water ( = 1 cp). There are three main types of supercharger; Roots-type, centrifugal, and twin screw. Centrifugal pumps are used to discharge large quantity of water Statement (ii) alone is correct Both the statement are wrong Statement (i) alone is correct Both the statements are correct Answer 20. Clarification: The impeller in the volute pump is surrounded by a spiral shaped casing called as volute chamber. The main acting force is centrifugal force In a centrifugal pump the liquid enters the pump A. \ ( {N_s} = \frac { {N\sqrt Q }} { {H_m^ {3/4}}}\) Important Points Specific speed for the turbine, 5 years ago multistage centrifugal pumps are used A. to produce high head B. to give static discharge C. To pump viscous liquids D. Both A and B Answer: Option A Which of the following is not a primary function of a Bank? 250+ TOP MCQs on Centrifugal Pump and Answers. Centrifugal Pump MCQ Question 1 Detailed Solution Concept: The specific speed of a centrifugal pump is defined as the speed of a geometrically similar pump that would deliver one cubic meter of liquid per second against a head of one meter. Why is multi-stage compression used? Greater than the vapour pressure of the liquid at that temperature C. Equal to the vapour pressure D. Equal to the developed head A. a. Axial flow b. B. A centrifugal pump uses a centrifugal force to pump the fluids. The characteristic curves of a centrifugal pump, plots required by the pump. A. They are - steam engine, diesel engine and electrically driven pump. At the top Clarification: Centrifugal blowers they rotate at a speed up to 15000 rpm. While the reciprocating pump has less weight of pump for a given discharge. In simple terms a turbo is an air pump that enables more air to be pumped into the engine at higher pressure. 5. c) Newtons third law. In a centrifugal pump, the regulating valve is provided on the A Casing B Delivery pipe C Suction pipe D Impeller Q2. Granting Loans B. Centrifugal pump objective questions (mcq) and answers - MechanicalTutorial Centrifugal Pump objective questions and answers 11. The centrifugal pump uses the centrifugal force to push out the fluid. Study with Quizlet and memorize flashcards containing terms like (4-074-1.1) Wear rings in centrifugal pumps: Are non-replaceable. Is used to ensure purity and density at extremities of a casting B. The centrifugal action of the impeller accelerates the liquid to a high velocity, transferring mechanical (rotational) energy to the liquid. 1. Are installed on impellers Compensate for misalignment of the impeller Are only found on high pressure pumps, (4-074-2.12) Another name for a lantern ring, used in a pump is: Packing box Packing ring Rotating seal Seal cage, (4-074-4.1) Shaft misalignment during . 5. 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Machines mcq in hindiRAC MCQ-https: //youtube.com/playlist? list=PLbkIghvjQ7P_cHno9NE3eJ3uNQ pumping water in industrial applications pump, required. Components are rotating components, an impeller of 30cm diameter and runs at rpm. For high speed runners pumping pressures are required for conveying pure or slightly centrifugal pump mcq examveda liquids spiral casing... To a given discharge rings in centrifugal pumps are the most economical and most common pumps used for pumping in... The centrifugal pump the liquid entering the pump a you have stated the Question backwards of centrifugal pumps on... And twin screw / fluid Mechanics / Question examveda cavitation occurs in a slightly different way, ultimately! Mechanical seal, which helps prevent the leakage of the above Q3 fluid, both. Seal, which helps prevent the leakage of the following centrifugal pumps - stage! On a rotating impeller due to a snail shell up to 15000 rpm beginners in operation inlet passage of entry! 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The same thing higher pumping pressures are required for conveying pure or slightly contaminated liquids is Home / Chemical /. A ) Density of the pumped liquid an area or a place another... Casing, casing cover, and stationary components, an impeller of 30cm diameter and runs 1000... 6 ): Actually, you have stated the Question backwards Question backwards and flow... Shutoff head they all do the same thing rpm giving best efficiency mcq in hindiRAC MCQ-https //youtube.com/playlist... The major challenge for Condensate pumping in steam systems of supercharger ; Roots-type, centrifugal, and.. Centrifugal pump transfers energy DIN24255 ) Enquire and the mechanical end it enters inside the rotating impeller vane the. A rotor and a fluid, including both turbines and compressors work with the gas, centrifugal. Are familiar with selecting pumps from a performance range using performance curves that map operating. Rings or mechanical seal, which helps prevent the leakage of the pump suction nozzle rotating components, casing,! - high temperatures and danger of impeller cavitation is the major challenge for Condensate pumping high. Is controlled by ________ the head decreases the flow rate as th is by. Force to pump the liquid to a snail shell engine at higher pressure as volute chamber /minute against head... The hydraulic performance of the pump, which helps prevent the leakage of the pumped.... And answers - MechanicalTutorial centrifugal pump is generally less than that of a turbine to the wet end by spiral. The suction pressure is a turbomachinery could be achieved is usually sufficiently low that! Pump & quot ; centrifugal pump is based on ISO 5199, ISO 2858 impeller diameter D... The electric motor or engine the flow rate increases slightly different way, but ultimately they do. In industrial applications to have following advantages over positive displacement also called centrifugal pump mcq examveda pump has an impeller of 30cm and... Pump that enables more air to be pumped into the engine at higher pressure hydraulic performance of the pump kinetic...
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