Each hole is called a “cylinder bore”. Automobile Engineering MCQ Practice Test - Set 01 MCQ Automobile Edit Practice Test: Question Set - 01. The subsequent combustion rapidly expands and pushes the piston down the length of the cylinder bore, away from the cylinder head, and with a lot of pressure. This high-speed rotation requires more surface area to prevent the rod and crank from being damaged by friction. This sandwiched piece is called the head gasket. It also analyzes reviews to verify trustworthiness. (5) Answer: Option D The big end of the rod spins smoothly on the journal of the crank on a pressurized oil film that coats a soft metal sleeve bearing. (or throttle body) air cleaner intake manifold intake ports cylinders, Air Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It is in this combustion chamber that the spark plug creates an electrical arc which ignites the air/fuel mixture. Most cars as we know them are powered by what is called a 4-stroke engine. Practice Test: Question Set - 16 1. For now, we just need to know that the cylinder head, or head for short, just sits on top of the block and covers each of the cylinders that have pistons in them. The surface area where the connecting rod pivots around the wrist pin is called the wrist pin journal. Over time, he has had success engaging students through the use of intense questioning and discussion. We will cover these in greater detail in the ENGINE 101 PART 2 section. For now, what you need to know is that the 4-stroke cycle explains how a mixture of gasoline and air can be ignited, combusted and smoothly converted into useable power to hurl you down the quarter mile, around a track or just take you to work. Certifying organizations As stated on their Web site, the National Institute for Automotive … Eng. During the 4-stroke process, the intake valves open to allow the air/fuel mixture into the combustion chamber then closes as the piston rises to compress the mixture. That power produced in one cylinder is multiplied because the combustion events are repeated in each of the cylinders. After the mixture is ignited and burns, the piston is pushed down into its bore. The rings act as a seal that keep the cylinder pressure from the combusted air and fuel mixture between the head and top of the cylinder, ensuring the pressure pushes the piston down instead of pushing past it. cleaner carburettor (or throttle body) intake manifold intake ports cylinders, Departmental Interview Questions Practice Tests, Objective Mechanical Engineering & Technical Interview E-book, Civil Engineering MCQ with Interview Questions and Answers, Objective Electrical Engineering with Interview Questions and Answers, SSC JE Previous Years Solved Papers (FREE), Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07, Strength of Materials Objective Questions with Answers - Set 10, Industrial Engineering Objective Type Questions with Answers - Set 05, Estimating and Costing Objective Questions and Answers - Set 01, I.C Engines Multiple Choice Questions with Answers - Set 02, Structural Analysis Objective Type Questions and Answers - Set 01, Automobile Engineering Objective Questions with Answers - Set 16, Hydraulics and Fluid Mechanics MCQ - Set 01. Prime members enjoy FREE Delivery and exclusive access to music, movies, TV shows, original audio series, and Kindle books. Some camshaft lobes push directly on the valves to open them, but most street-driven car engines work indirectly through a rocker arm. Practice Test: Question Set - 01 1. (1) Answer: Option D The aluminum blocks use a steel-alloy cylinder liner or specially-coated bores so that they have a harder surface and will provide an extended service life. (7) Answer: Option D Visible within each chamber are the tip of the spark plug and the flat parts of the valves. On some engines the wrist pin is fed from oil scraped by rings from the cylinder walls through a passage from the oil ring groove called a pin oiler. A 4-stroke refers to the four strokes in the power cycle; the intake stroke, the compression stroke, the power stroke and the exhaust stroke. It is a good reference for reviewing material. Most modern engines have a dual overhead cam (DOHC) valvetrain which means that the intake and exhaust valves have their own camshafts. If you’re looking under the hood, it’s the big piece of metal that’s found in the center of the engine bay that seems to have a whole bunch of other metal, wires and tubes attached to it. (15) Answer: Option D. Practice Test: Question Set - 07 1. Fundamentals of Automotive Technology: Principles and Practice. Practice Test: Question Set - 03 1. This is a great textbook that matches the curriculum that has been used at the school I attend. The connecting rod is coupled to the piston by a tube called a wrist pin.
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