Are you looking for a job that will give you a lifetime career? Are you trying to make a professional career in the IC Engine field as a Design Engineer? Are you facing difficulties with IC Engine interview questions 2022? Then this is the right blog to groom your knowledge for interview preparation. We have recorded the most vital and hand-picked IC Engine interview questions and answers. Gain information to become an IC Engine Designer from this up-to-date blog.
The full form of an IC Engine is Internal Combustion Engine. It helps automate mechanical engineering to reduce manual labour engagement and hard work. Belgian inventor Étienne Lenoir is the founder of this engine. He developed the first ic engine named "hippomobile," powered by gas.
Let's have a look at a few fun facts about internal combustion engines before you start your interview preparation:
We have classified IC Engine Interview Questions - 2022 (Updated) into three stages, they are:
Top 10 IC Engine Interview Questions And Answers
The internal combustion engine turns chemical energy into useable mechanical energy by burning fuel. When the spark ignites the fuel-air mixture in the combustion chamber, chemical energy is released. The gas created in this reaction rapidly expands on the power stroke, forcing the piston down the cylinder.
Dugald Clerk invented a two-Stroke engine in 1880, with suction, compression, expansion, and exhaust occurring during the 2-stroke of the piston. Every one of the crank shifts will give one stroke. Animation depicts a two-stroke engine in action, complete with a tuned exhaust pipe.
A 4-stroke engine is an internal combustion engine in which the piston performs four different strokes—intake, compression, power, and exhaust—throughout two crankshaft revolutions and one thermodynamic cycle.
It runs on natural and synthetic gas.
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|Two-stroke engine||Four-stroke engine|
|A two-stroke engine fires once every revolution||A four-stroke engine fires once every two wheels.|
|Two-stroke engines are more straightforward and lighter, but they are less adaptable.||In four-stroke engines, ports replace valves; in two-stroke engines, the piston acts as a valve to control the flow of Gasoline.|
|Two-stroke engines are often utilized in light-duty applications.||In four-stroke engines are employed in heavy-load applications.|
Engine types differ substantially in a variety of ways, and the following are some of the performance indicators:
In gasoline generators, the compressor consumes 70 percent of the output of the gasoline turbine. As a result, the auxiliary intake on IC engines is much lower. In addition, when compared to gas turbines, the combustion temperature of IC engines is substantially higher.
Lubrication oil must be loaded between piston jewels while the piston is at the backside of the stroke for adequate lubrication. This allows for the proper storage and use of a large quantity of lubricating oil.
The boiling point of glycerine is 90°C, enhancing its heat carrying capacity. As a result, the weight of the coolant is lowered, allowing for the use of a smaller radiator.
The top, second, and oil rings are all constant at a 180-degree angle. Place the hoop about 1 inch below the collarbone.
Octane No. - Octane amount is the percentage of iso-octane in a combination of iso-octane and h-heptane expressed in volume. It is the SI engine's score measurement.
Cetane No -The cetane range is defined as the proportion of n-cetane in the aggregate of n-cetane and alpha-methyl naphthalene measured in terms of extent. It is the CI engine's rating scale.
The compression ratio of an internal combustion engine is defined as the ratio of the volume of the cylinder (when the piston is closest to the cylinder head) to the combustion chamber volume (when the piston is farthest out). The higher the ratio, the more the air in the cylinder is compressed. The air in engines is compressed because it produces a tremendous explosion from the air-fuel mixture, resulting in more fuel usage. Automotive engineers use this method to build engines as fuel-efficient as possible.
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A carburetor is a device that mixes air with fuel to supply a spark ignition system in an internal combustion engine. It's only utilized in engines that can ignite with a spark, like a gasoline engine. Some of the components used in the carburetor are a choke, a liquid fuel storage chamber, the main jet, an accelerator pump, an idling jet, and a venture-shaped airflow restriction.
Ans: One of the essential tools for better understanding engine performance and emissions in internal combustion engines is combustion modelling.
Ans: It refers to igniting an air-fuel mixture with a spark from a spark plug. This word refers to petrol engines, not diesel engines, which do not require an external spark to start the combustion process.
The Crankshaft is in charge of the engine's proper operation. It converts the linear motion of the piston into a rotating signal. Because crankshafts are subjected to a high level of cyclic loading, they must have a high fatigue strength and wear resistance to function for an extended period.
The compressor consumes 70% of the gas turbine output in gas turbines. IC engines consume more auxiliary. As a result, the IC engine's combustion temperature is too much higher than the turbine engine.
The SI (spark ignition) engine runs on petrol, whereas the CI (compression ignition) engine runs on diesel. This is because the compression ratios of both fuels are different.
The compression ratio in a SI engine is 8-12:1. The compression ratio in a CI engine is 16-22:1. So, in a SI engine, the compression ratio is insufficient for Gasoline to burn, necessitating the use of a spark plug, whereas, in a CI engine, the compression ratio is so high that the fuel is combusted due to internal heat, eliminating the need for a spark plug. As a result, the SI engine's technology differs from the CI engine's.
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The output power generated in the Crankshaft is called break power. When the fule burns, the engine will generate this indicated power.
The piston generates a power stroke to produce the expected engine output at the actual cycle time. We can define the total work volume per cycle by measuring the adequate pressure.
If you want to test the indicated power in the multi-cylinder engine, you must do a morse test. First, you need to follow the engine dynamometer at a particular speed for both cylinders, and then you have to note down the BHP fall in each noting. You don't need to use an indicator diagram also.
The pre-ignition occurs in the spark plug due to the mixture of air and fuel. At a high temperature, the carbon layers form inside the engine.
It is a chemical reaction due to the gas phase, which sometimes creates light, heat, smoke, and flame. It mainly takes place in the fuel cell. You can be control combustion by reducing the engine's high temperature.
A valve timing diagram is a graphical representation of the opening and closing of the intake and exhaust valves of the engine. The opening and closing of the engine's valves depend upon the piston's movement from TDC to BDC. This relation between piston and valves is controlled by setting a graphical representation between these two, which is known as the valve timing diagram.
The idle stroke constitutes a small gap of a few micrometres between the piezoelectric actuator and the control valve, which must be adjusted during the assembly process. Therefore, the identification approach only relies on analyzing the electric signals of the piezoelectric stack actuator.
Clearance volume or bumping clearance is the space between the top of the piston and the cylinder head of an air compressor. This clearance is an essential aspect of the compressors and should be as less as practically possible to improve the volumetric efficiency of the compressor.
That is because the engine is running too Lean a mixture (lack of fuel). This condition wilt leads to overheating and failure of the engine.
Flywheel has standard functions like providing continuous power when the energy source is discontinuous and delivering power faster. However, the primary part of the Flywheel is to store rotational energy. Therefore, the amount of energy stored in the Flywheel is directly proportional to the square of its rotational speed.
IC engine research work has led to improving the engine's performance, fuel efficiency, development of new advanced combustion engines, and reducing nitrogen oxide emissions. So let's learn more about IC Engine to gain sharp growth in our professional career.
IC engines come with zero-emission. There is so many ic engine latest version. So if we talk about pollution from machines, it has significantly more minor and decreases day by day as new technologies come with the new fuel system. Ic engine designers have a very bright future in this area.
As new models are coming up, there are no chances to become obsolete. Transportation task is going to create more new implementation.
Ignition of the mixture is the minimum required for an ic engine.
We can use Gasoline, diesel, marine fuels, and turbine fuels in ice engines.
We can not use methanol in the ic engine as fuel because this fuel has high octane number and a low octane number. This is because the octane number indicated hit is generated due to the energy.
Fuel is the most critical component in an engine. Alcohol is effective in case of a power race. It heats less than Gasoline. So once the initial power is required, alcohol consumption will increase. At the end of the race, it will give more energy as the total engine weight will be less because some percentage of fuel has already burned out.
It is more potent than alcohol and Gasoline. Methanol's combined octane rating is 119, while the regular gasoline octane rating is 87.
IC Engines run many engines like:
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Madhuri is a Senior Content Creator at MindMajix. She has written about a range of different topics on various technologies, which include, Splunk, Tensorflow, Selenium, and CEH. She spends most of her time researching on technology, and startups. Connect with her via LinkedIn and Twitter .
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