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The volumetric efficiency is affected by mcq

The volumetric efficiency is affected by _____ a) the exhaust gas in the clearance volume b) the design of intake and exhaust valve c) valve timing d) all of the mentioned; Mean effective pressure at a given compression ratio is maximum when the air fuel ratio is a) higher than stoichiometric b) lower than stoichiometric c) equal to stoichiometri 49. The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor,is called..... A. Compressor efficiency B. Volumetric efficiency C. Isentropic efficiency C. Mechanical efficiency

Clarification: The volumetric efficiency of the Kaplan turbine is given by Q - ΔQ/ Q. In this problem, ΔQ = 0.1Q. Thus, Q - ΔQ = 0.9Q. Hence, we get volumetric efficiency as 90%. The problem can be solved with the available information. 7. A student reports the volumetric efficiency of a Kaplan turbine to be 95% The volumetric efficiency is maximum 1.00 (or 100%). At this value, the engine is capable of drawing all of the theoretical volume of air available into the engine. There are special cases in which the engine is specifically designed for one operating point, for which the volumetric efficiency can be slightly higher than 100 % a. Thermal efficiency b. Mechanical efficiency c. Volumetric efficiency Ans: b. 12. The percentage of the energy in the petrol burnt in the engine which is actually utilized in propelling the car is as little as a. 25% b. 60% b. 35% d. 15% Ans: a. 13. In the diesel engine, the compression ratio is as high as a. 10:1 b. 15:1 c. 5:1 Ans: b. 14

The actual quantity of air pumped divided by the perfect quantity equals the volumetric efficiency (VE). VE is measured in percent. Factors that affect an engine's volumetric efficiency are intake and exhaust restrictions, valve timing, cylinder sealing, gas inertia, runner design and rpm, among others (c) low volumetric efficiency (d) minimum turbulence (e) high power output and high thermal efficiency. 226. Deposition of carbon in petrol engine cylinder would result in increase of (a) clearance volume (b) swept volume (c) compression ratio (d) volumetric efficiency (e) mean effective pressure. 227 Automobile Engineering Objective Type Questions & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries Volumetric efficiency (VE) in internal combustion engine engineering is defined as the ratio of the mass density of the air-fuel mixture drawn into the cylinder at atmospheric pressure (during the intake stroke) to the mass density of the same volume of air in the intake manifold. The term is also used in other engineering contexts, such as hydraulic pumps and electronic components Learn Compressors, Gas Turbines And Jet Engines MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Compressors, Gas Turbines And Jet Engines MCQ question is the important chapter for a Mechanical Engineering and GATE students

MCQ ON INTERNAL COMBUSTION ENGINE - Amit Maht

  1. ation, and another entrance exam. Internal Combustion Engines (I.C. Engines): MCQ question is the important chapter for a Mechanical Engineering and GATE students
  2. The volumetric efficiency significantly varied with the engine speed, and appeared to be slightly affected by the diesel replacement rate (Fig. 12). Fig. 12 . Volumetric efficiency measured by Mahgoub et al. [98] with the use of composition A ( Table 4 )
  3. volumetric efficiency depends on inlet pressure and temperature. So increase in any one of them will lead to enhance the combustion efficiency or combustion temperature

following factors effect the volumetric efficiency of air compressor:- clearance between the piston at t.d.c and cylinder cover. larger the clearance, lesser the air discharged per stroke and lesser will be the volumetric efficiency of air compressor. sluggish operation of valves. leaky piston rings. ineffective cooling due to choking of inter and after cooler o Compressors, Gas Turbines & Jet Engines MCQ with detailed explanation for interview, entrance and competitive exams. B It greatly affects volumetric efficiency . C It results in minimum work . Volumetric efficiency of a compressor with clearance volume 1. Better volumetric efficiency (VE) over the engine speed range (VE is a measure of the 'breathability' of the engine or the extent to which the cylinder of an engine is completely filled by the incoming charge following an exhaust stroke. It is also important to understand that the VE is a ratio of masses, not of volumes.) 2. Low sensitivity to pressure losses in the exhaust syste May 02,2021 - SI And CI Engines - MCQ Test 2 | 30 Questions MCQ Test has questions of Mechanical Engineering preparation. This test is Rated positive by 86% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature. 67) greatly affected by clearance volume. More Questions on Pressure Vessels and Engines Objective Questions with Answers MCQ

May 01,2021 - Refrigerant Compressors - MCQ Test 1 | 20 Questions MCQ Test has questions of Mechanical Engineering preparation. This test is Rated positive by 93% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers 10) The volumetric efficiency of an air compressor is the ratio of a) Displacement volume to clearance volume. b) Volume of air before compression to the volume of air after compression. c) Displacement volume to volume of air sucked inside the cylinder. d) Actual free air delivered to the displacement volume. View Answer / Hide Answe Hydraulics & Fluid Machineries MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding

Learn About Volumetric Efficiency and How it Affects

Home Mechanical Engineering Mcqs As the value of index '«' is decreased, the volumetric efficiency will_____? Posted By: Faisal Wahab on: November 18, 2020 In: Mechanical Engineering Mcqs Print Emai Home Mechanical Engineering Mcqs Volumetric efficiency of a compressor with clearance volume _____? Posted By: Faisal Wahab on: November 17, 2020 In: Mechanical Engineering Mcqs Print Emai Factors that affect an engine's volumetric efficiency are intake and exhaust restrictions, valve timing, cylinder sealing, gas inertia, runner design and rpm, among others. Among the external factors affecting VE are, barometric pressure, air temperature and humidity

(PDF) VOLUMETRIC EFFICIENCY - PROBLEMS IN EXPERIMENTAL

Volumetric efficiency (VE) is the actual amount of air flowing through an engine, compared to its theoretical maximum. Basically, it is a measure of how full the cylinders are. VE is expressed as a percentage. An engine operating at 100% VE is using all of its volumetric capacity. How is it calculated? The formula for VE is 19. The volumetric efficiency ____ when carried out in stages. a) decreases. b) increases. c) remains constant. d) none of the mentioned. 20. The first stage of compression is done in ____ cylinder and next stage in ____ cylinder. a) both in high pressure cylinder. b) both in low pressure cylinder. c) high pressure, low pressure. d) low.

250+ TOP MCQs on Efficiency of Kaplan Turbine and Answer

91. A turbine has a mechanical efficiency of 93%, volumetric efficiency of 95% and total efficiency of 82%. If the effective head is 40 m, find the total head. A. 48.72 m. B. 40.72 m. C. 36.22 m. D. 34.72 Volumetric efficiency of a well designed engine may be in the range [A]. 75 to 90 percent [B]. 50 to 75 percent [C]. 40 to 50 percent [D]. Below 40 percen Mechanical Engineering multiple choice questions and answers on Mechanical Engineering MCQ questions on Mechanical Engineering questions. Page a) volumetric efficiency is maximum b) flow through machine is maximum c) both of the mentioned d) none of the mentioned Answer: c Explanation: We can get this from volumetric efficiency equation. 23. For a given pressure ratio, volumetric efficiency is zero when maximum clearance is a) 1 / ((p2/p1)^(1/n) +1) b) 1 / ((p2/p1)^(1/n) -1 a. Thermal efficiency will be increased b. Volumetric efficiency will be increased c. Air standard efficiency will be decreased d. Air standard efficiency will be increased Ans: d. 37. In 'V' type engines the included angle between two banks of cylinders is a. 450 b. 600 c. 1300 d. 900 Ans: d. 38

How to calculate the volumetric efficiency of an internal

Volumetric efficiency is low for a given pressure ratio: multistage Compressor Volumetric efficiency is high for a given pressure ratio: 7. Single stage compression System required more power for same power output. Multistage Compression System required low power for same power output. 8. In single stage Compressor Lubrication Liquid oil is. In this video I try to explain about Volumetric efficiency. if you will face any problem regarding this topic feel free to ask in the comment box and if yo.. The volumetric efficiency of an internal combustion engine indicates the efficiency with which it can move the charge in and out of the cylinders. Specifically, the volumetric efficiency is the ratio (or percentage) of the volume of air which the cylinder/s collect during the suction stroke compared to the volume of the cylinder/s under the.

Automobile Engineering MCQ Objective Question and

Volumetric efficiency is defined as the ratio of actual flow rate of air into the intake system to rate at which the volume is displaced by the system. ηv= (m ̇a/Ρa )/(V dispaced x N/2) Ρa= Inlet density is taken atmospheric air density. N= Number of cylinder in use Volumetric efficiency • The volumetric efficiency is probably one of the most variable efficiencies governing the performance of engines. It is a measure of the effectiveness of an engine and exhaust system as air pumping devices. The volumetric efficiency is effected by a great many variables The overall efficiency of the engine is given by the brake thermal efficiency, . i.e. where ̇ is the mass of fuel consumed per unit time, and is the lower calorific value of the fuel. ۲ 25.The clearance volume of the air compressor is kept minimum because. it allows maximum compression to be achieved: it greatly affects volumetric efficiency

Improving Volumetric Efficiency. Complex interactions between the air in the cylinder, movement of the valves and piston, and the air in the intake manifold affect volumetric efficiency. To improve an engine's efficiency, some engine designs use two intake valves instead of one, which increases the amount of air and fuel that flows through them Mechanical Engineering Mcqs for Preparation of Job Test and interview, freshers, Students, competitive exams etc. Multiple choice questions here are on topics such as Machine Design, Theory of Machines, Hydraulic Machines etc. C. to attain high volumetric efficiency MCQs: The clearance volume of the air compressor is kept minimum because? - (A) it allows maximum compression to be achieved - (B) it greatly affects volumetric efficiency www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET Regardless of whether you have a normally aspirated or turbocharged engine improving the engines Volumetric Efficiency will provide improved power. When an engine is throttled back to a low cruise power setting, engines are starving for air and any improvement in the cylinders Volumetric Efficiency will greatly affect aircraft performance

Driveability Corner Volumetric Efficiency (VE) MOTOR

In both vacuum leaks or fuel delivery issues, volumetric efficiency isn't affected because the engine can still inhale air and exhale exhaust. Air Metering Issue. A couple examples of air metering issues can be a faulty mass airflow sensor or faults with the air tubes between the mass airflow sensor and the throttle plate Volumetric efficiency relates to the output flow per revolution of the pump's input shaft. It measures the pump's ability to minimize leaks between high- and low-pressure regions. Mechanical efficiency relates to the motor's output torque and is an indicator of the fluid's ability to prevent friction

Question is ⇒ The clearance volume of the air compressor is kept minimum because, Options are ⇒ (A) it allows maximum compression to be achieved, (B) it greatly affects volumetric efficiency, (C) it results in minimum work, (D) it permits isothermal compression, (E) none of the above., Leave your comments or Download question paper Volumetric efficiency is defined as a ratio of a gaseous substance entering a cylinder to the volumetric displacement of a piston. Inside a compressor, there are cylinders into which fuel, air, coolant, or another gaseous substance is injected

300+ TOP I.C. ENGINES Objective Questions Answers MCQ

  1. g play a great role in this deter
  2. g and exhaust systems to fill an engine's cylinders with air, it's particularly useful to understand the concept when diagnosing exhaust restriction. Obviously, as exhaust ¬restriction increases, volumetric.
  3. g into combustion chamber. If the temperature is high then the.
  4. Working of 4-Stroke Diesel Engine| What is the working of 2-Stroke Diesel Engine? Advantages and Disadvantages of four and Two stroke Engine. Note- At the End of article we will provide some MCQ. What is IC Engine: In internal combustion engine the combustion of fuel takes place inside the engine cylinder is known as IC Read mor
  5. ute, RPM) are not affected by the suction vapor.

Simply put, the volumetric efficiency is the ratio of air going into the engine to the ratio of air that the cylinder geometry can accommodate at standard pressure. A volumetric efficiency of 90%, therefore, means that only enough air to fill 5.58L is actually going into the engine but that 5.58L is being spread out over the full 6.2L. There are two obvious methods: The Turbocharger and the Supercharger. They run on resp. the exhaust gas flow and the crank shaft to compress air and force it into the engine. Though they rob power from the engine to do so. There are other (better).. Compressors, Gas Turbines & Jet Engines Mcqs Set 1 with answers and explanation for placement tests, other tests etc. These solved multiple choice questions are extremely useful for the preparation for exams, campus placement of all freshers including Engineering, MBA and MCA students, Computer and IT Engineers etc A diesel engine has a brake thermal efficiency of 30 %. If the calorific value of fuel is 42000KJ/Kg. Find its Brake specific fuel consumption. (CLO-3) (L4) Explain the following engine parameters (i) Brake specific fuel consumption (ii) Volumetric efficiency. (CLO-3) (L2) Draw the Heat balance sheet of IC engines. (CLO-3) (L3

Automobile Engineering Quiz Automobile Engineering

This represents 100% volumetric efficiency. An internal combustion engine has to operate under a wide range of rpm, load and atmospheric conditions, and therefore achieves a wide range of VE—generally less than 100%. A number of factors affect volumetric efficiency a) Mechanical efficiency. b) Overall efficiency. c) Indicated thermal efficiency. d) Volumetric efficiency . Q16. A compressed air may be used. a) In gas turbine plants. b) For operating pneumatic drills. c) In starting and supercharging of I.C engines. d) All of the above . Q17. The ratio of recharge pressure to the inlet pressure of air is.

Volumetric efficiency - Wikipedi

a) Manometric efficiency. b) Mechanical efficiency. c) Overall efficiency. d) Volumetric efficiency . Q10. Multi stage centrifugal pumps are used to. a) Give high discharge. b) Produce high heads. c) Pump viscous fluids. d) All of these . Q11. Which of the following statement is correct ? a) The centrifugal pump is suitable for large discharge. Compressor's Volumetric Efficiency. The goal is to keep the Volumetric Efficiency as high as possible. With a higher VE, a compressor produces more lbs/min or lbs/hour of refrigerant flow Systems operating conditions, evaporating and condensing pressures, directly affects compressor pumping ability VE Ratio of Condenser pressure to evaporator. 11. The ideal efficiency of a simple gas turbine depends upon (a) temperature ratio (b) pressure ratio (c) volume ratio (d) mass ratio. 12. The device which delivers the heat from low temperature to high temperature in a cyclic process is known as (a) heat engine (b) heat pump (c) compressor (d) condenser. 13

How to create a volumetric efficiency calculator - YouTube

213. An air-conditioning system is used to maintain a house at 75°F when the temperature outside is 95°F. The house is gaining the heat through the walls and windows at a rate of 1250 Btu/min, and the heat generation rate within the house from people, lights, and appliances amounts to 350 Btu/min. Determine the minimum power input required for this air-conditioning system I think the sensitivity of the regulator would be adversely affected if it is used with a mixer that is either way to small or way to large. Fuel flow requirements calculations Engine air flow requirement calculation: CFM = Cubic Inches x RPM x Volumetric Efficiency (VE) ÷ 345 The volumetric efficiency of any engine is heavily dependent on the timing of IVC at any given speed. The amount of fresh charge trapped in the cylinder is largely dictated by IVC and this will significantly affect engine performance and economy. For maximum torque, the intake valve should close at the point where the greatest mas

Intercooled Vs

Compressors, Gas Turbines And Jet Engines MCQ Questions

37. The volumetric efficiency of a compressor is --- proportional to its clearance factor? a. Directly b. Inversely c. Equally d. Unequally 38. The volumetric efficiency of a compressor depends upon which factor? a. Valve pressure b. Clearance Factor c. Heat gain of the cylinder d. All of these 39. The refrigerant supplied to Lesser the volumetric efficiency less is the capacity of the compressor. The volumetric efficiency of the compressor also depends on the compressor ratio. If the difference between the suction and the discharge pressure is higher, the refrigerant will remain trapped inside the clearance volume for longer time and prevent the opening of the. This test comprises of 50 questions on Hydraulics and Pneumatics. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. Questions on Fluid Power in Machine Tools, Hydraulic Elements in Design of Circuits, Accumulators and Intensifiers, Fluid Power in Machine Tools, Accumulators and Intensifiers, Hydraulic Elements in Design of Circuits. Overall efficiency = 11.4 0.792 79.2€% 14.4 Example 1.11 A hydraulic motor has a volumetric efficiency of 90% and operates at a speed of 1750 RPM and a pressure of 69 bar. If the actual flow rate consumed by the motor is 0.0047 m3/s and the actual torque delivered by the motor is 147 Nm, find the overall efficiency of the motor How to measure volumetric efficiency of engine As seen in volumetric flow rate, the volumetric efficiency is defined this way: Where: The theoretical volumetric flow rate (Qth) is more or less chosen arbitrarily, based on atmospheric air density. Because air is compressible, a volume does not limit the quantity of air that can be pushed in.

Internal Combustion Engines (I

8. The volumetric efficiency is affected by a) the exhaust gas in the clearance volume b) the design of intake and exhaust valve c) valve timing d) all of the mentioned. 9. In petrol engine the actual pressure developed compared to the predicted maximum pressure is a) 90% b) 70% c) 50% d) 25%. 10 VOLUMETRIC EFFICIENCY Volumetric efficiency (VE) is the percentage of stroke that fills with gas at suction pressure and suction temperature. In equation form (referring to Figure 1): Some notes about VE: VE represents the capacity. VE is NOT suction valve open time. The suction valves do not have to be open for the full VE

Speed-Wiz engine efficiency calculation

Compressor Efficiency and More by Khiem Dinh Compressor efficiency is a term thrown around whenever people mention forced induction, but what does it really mean? How does it affect an engine's performance? And what role does air temperature play in all of this? The cool thing about thermodynamics is that we can explain effects with equations Volumetric Efficiency The density of fresh charge As the fresh charge arrives in the hot cylinder, heat is transferred to it from The hot chamber walls The hot residual gases Temperature rise reduces the density , which decrease the mass of fresh charge admitted and a reduction in volumetric efficiency The volumetric efficiency increased b Understanding volumetric efficiency and its relationship to torque is important. By one definition, we can say that v.e. is the ratio of an engine's actual air capacity to its ideal air capacity.

The more fuel/air charge drawn into the cylinder, the higher the volumetric efficiency. The higher the volumetric efficiency, the higher the torque. The biggest factor affecting the volumetric efficiency is the valve timing, specifically the valve overlap angle and the intake valve closing angle. Volumetric efficiency can also be improved by. what affects volumetric efficiency? Complex interactions between the air in the cylinder, movement of the valves and piston, and the air in the intake manifold affect volumetric efficiency. To improve an engine's efficiency, some engine designs use two intake valves instead of one, which increases the amount of air and fuel that flows through them Comparison of volumetric efficiency with variable intake manifold without variable intake manifold improvement in volumetric efficiency 0,8 1000 2000 3000 0,7 0,9 1,0 4000 Torque position of VR6 variable intake manifold The torque position shows air channelling in low engine speed range. The change-over barrel has closed the power pipes The variation of volumetric efficiency with power output with intake boost pressure is shown in Fig: 5. With theincrease of boost pressure more air is available for the combustion which further increases the combustion efficiency. Athigher boost pressures excess air doesn't improve the combustion efficiency [5]. Fig.5. Comparison of. Volumetric Efficiency The relationship between the effective air delivery and the geometric volume is the volumetric efficiency. Volumetric efficiency is affected in the rotor stator unit by the air leakage from the area under pressure towards the intake. It is important that these leakages are kept to an absolute minimum, as the energy.

Volumetric Efficiency of Reciprocating Compressor- RAC

Thermodynamics MCQ Quiz & Online Test: Below is a few thermodynamics MCQ test that checks your basic knowledge of Thermodynamics. This Thermodynamics Test contains around 20 questions of multiple choice with 4 options. You have to select the right answer to a question How to improve volumetric efficiency Volumetric efficiency is a ratio expressed in terms of percentages. It is a comparison of the volume of fuel/air charge (corrected for temperature and pressure) inducted into the cylinders to the total piston displacement of the engine. Various factors cause departure from a 100 percent volumetric efficiency The volumetric efficiency is expressed as a percentage from 0 to 100 percent, depending on the system in question. Volume efficiency is defined as the ratio of the actual volume of the refrigerant gas pumped by the compressor to the volume displaced by the compressor pistons. A high volumetric efficiency means that more of the piston's cylinder.

Engine Volumetric Efficiency - an overview ScienceDirect

Video: What are the effects of volumetric efficiency on

reciprocating compressorAEM Performance Electronics - What is Volumetric

Affect of propeller diameter on propeller RPM. b. Types of gear reduction (1) Advantages of spur gear system (2) Advantages of. bevel planetary gear' Identifying Factors Affecting Volumetric Efficiency. a. Affect of intake manifold on volumetric. efficiency. b. Explain the term normal aspirating engine 0. Affects of supercharging on. There are 3 efficiencies we are interested in maximizing for a torque/hp monster: volumetric efficiency, mechanical efficiency, and thermal efficiency. Volumetric efficiency refers to how well your engine breathes. An engine has 100% volumetric efficiency if the cylinders are 100% filled with air/fuel at atmospheric pressure And mechanical-hydraulic efficiency during retraction is: 1 - (500/5000) = 1 - 0.1 = 0.90 = 90% Overall efficiency is simply the product of volumetric and mechanical/hydraulic efficiency. In a modern hydraulic cylinder, where volumetric efficiency approaches 100%, overall efficiency equals mechanical/hydraulic efficiency: 0.95 x 1 = 0.95 = 95%

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