Homework Help is Here – Start Your Trial Now!
Engineering
Mechanical Engineering
.1 Briefly explain how a fixed choke carburettor works Air flows into the top of the _from the air intake system. The bore in the carburettor _(venturi) increasing the air speed (Bernoulli's principle*). The drop in air creates a vacuum around the end of the fuel jet positioned valve opens (increasing engine speed) the - The air pressure around the proportional to the speed of the air flowing through _ A metered amount of fuel will flow out of the fuel jet into the moving into the flow of air. As the volume of air entering the engine also fuel jet continues to . the air. To ensure fuel flows out of the jet, a drilling on top of the float chamber allows atmospheric pressure to be drawn in. During throttle valve operation the low pressure variation across the fuel jet also |varies. Combine this action with the atmospheric pressure in the float chamber will thereby maintain the correct fuel/air mixture ratio to the cylinders depending on throttle openings.

.1 Briefly explain how a fixed choke carburettor works Air flows into the top of the _from the air intake system. The bore in the carburettor _(venturi) increasing the air speed (Bernoulli's principle*). The drop in air creates a vacuum around the end of the fuel jet positioned valve opens (increasing engine speed) the - The air pressure around the proportional to the speed of the air flowing through _ A metered amount of fuel will flow out of the fuel jet into the moving into the flow of air. As the volume of air entering the engine also fuel jet continues to . the air. To ensure fuel flows out of the jet, a drilling on top of the float chamber allows atmospheric pressure to be drawn in. During throttle valve operation the low pressure variation across the fuel jet also |varies. Combine this action with the atmospheric pressure in the float chamber will thereby maintain the correct fuel/air mixture ratio to the cylinders depending on throttle openings.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
See similar textbooks
icon
Related questions
Question

I want answer for these 

Q.1 Briefly explain how a fixed choke carburettor works Air flows into the top of the the carburettor _from the air intake system. The bore in (venturi) increasing the air speed (Bernoulli's principle*). The drop in air into the flow of air. As the volume of air entering the engine also fuel jet continues to the creates a vacuum around the end of the fuel jet positioned valve opens (increasing engine speed) the The air pressure around the proportional to the speed of the air flowing through A metered amount of fuel will flow out of the fuel jet into the moving air. To ensure fuel flows out of the jet, a drilling on top of the float chamber allows atmospheric pressure to be drawn in. During throttle valve operation the low pressure variation across the fuel jet also varies. Combine this action with the atmospheric pressure in the float chamber will thereby maintain the correct fuel/air mixture ratio to the cylinders depending on throttle openings. Q.2 Briefly explain how a variable choke carburettor works moving inside generated by the engine. The movement is proportional to engine speed (more RPM the greater the choke area). Attached to the piston is a jet, located in the body Constant depression or variable choke carburettors feature a a chamber via a tapered of the carburettor. which moves in and out of a fixed openings, the piston rises and falls depending on variations either side of the piston. The action of the tapered needle in the fuel jet allows more or less fuel to into the passing air therefore the fuel/air remains constant for improved economy and performance at all engine During speeds.
Transcribed Image Text:Q.1 Briefly explain how a fixed choke carburettor works Air flows into the top of the the carburettor _from the air intake system. The bore in (venturi) increasing the air speed (Bernoulli's principle*). The drop in air into the flow of air. As the volume of air entering the engine also fuel jet continues to the creates a vacuum around the end of the fuel jet positioned valve opens (increasing engine speed) the The air pressure around the proportional to the speed of the air flowing through A metered amount of fuel will flow out of the fuel jet into the moving air. To ensure fuel flows out of the jet, a drilling on top of the float chamber allows atmospheric pressure to be drawn in. During throttle valve operation the low pressure variation across the fuel jet also varies. Combine this action with the atmospheric pressure in the float chamber will thereby maintain the correct fuel/air mixture ratio to the cylinders depending on throttle openings. Q.2 Briefly explain how a variable choke carburettor works moving inside generated by the engine. The movement is proportional to engine speed (more RPM the greater the choke area). Attached to the piston is a jet, located in the body Constant depression or variable choke carburettors feature a a chamber via a tapered of the carburettor. which moves in and out of a fixed openings, the piston rises and falls depending on variations either side of the piston. The action of the tapered needle in the fuel jet allows more or less fuel to into the passing air therefore the fuel/air remains constant for improved economy and performance at all engine During speeds.
Task 8 - Induction Systems In order for combustion to take place an induction system is required to feed fuel and air into the cylinder of an engine. To improve efficiency and performance spark ignition (SI) engines are now adopting compression ignition (CI) engine technology by injecting fuel directly into the cylinder just before the point of ignition however these engines still require an air induction system. Carburettors: before fuel injection technology had been fully developed carburettors (carbs) were used to create a fuel/air ratio at different engine speeds and loads. A cold start facility was also fitted albeit manually operated. The demand for more performance has meant the fixed choke carb' was no longer suitable. More complex carbs' were developed (twin choke) as well as variable choke (constant depression) carbs which used engine vacuum (during throttle opening) to vary the size of choke according to operating requirements.
Transcribed Image Text:Task 8 - Induction Systems In order for combustion to take place an induction system is required to feed fuel and air into the cylinder of an engine. To improve efficiency and performance spark ignition (SI) engines are now adopting compression ignition (CI) engine technology by injecting fuel directly into the cylinder just before the point of ignition however these engines still require an air induction system. Carburettors: before fuel injection technology had been fully developed carburettors (carbs) were used to create a fuel/air ratio at different engine speeds and loads. A cold start facility was also fitted albeit manually operated. The demand for more performance has meant the fixed choke carb' was no longer suitable. More complex carbs' were developed (twin choke) as well as variable choke (constant depression) carbs which used engine vacuum (during throttle opening) to vary the size of choke according to operating requirements.
Expert Solution
steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Dimensional Analysis
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Elements Of Electromagnetics
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY
SEE MORE TEXTBOOKS