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Questions and Answers
What is the term used to describe the time period between fuel injection and ignition in a diesel engine?
What is the term used to describe the time period between fuel injection and ignition in a diesel engine?
- Pre-combustion lag (correct)
- Fuel injection duration
- Ignition delay
- Combustion lag
What is the purpose of the piston ring clearance in diesel engines?
What is the purpose of the piston ring clearance in diesel engines?
- To aid in the protection of oil film
- To prevent the ring from buckling and breaking (correct)
- To allow the combustion gases to press the ring down on the set
- To allow the combustion gases to get behind the ring and press it against the cylinder liner
What is the term used to describe the transfer of heat energy through electromagnetic waves?
What is the term used to describe the transfer of heat energy through electromagnetic waves?
- Radiation (correct)
- Combination of conduction and convection
- Conduction
- Convection
Which of the following tasks must be done before starting a diesel engine?
Which of the following tasks must be done before starting a diesel engine?
What is referred to as the 'heart of the engine'?
What is referred to as the 'heart of the engine'?
Which part of the engine transmits to the crankshaft the power developed by the burning of the fuel?
Which part of the engine transmits to the crankshaft the power developed by the burning of the fuel?
What is defined as the distance traveled by the piston from one end of the cylinder to the other end?
What is defined as the distance traveled by the piston from one end of the cylinder to the other end?
What is the term used to describe the rotation of the crankshaft?
What is the term used to describe the rotation of the crankshaft?
What is the function of the part of the engine that helps the starting process?
What is the function of the part of the engine that helps the starting process?
What is the primary purpose of a governor in a diesel engine?
What is the primary purpose of a governor in a diesel engine?
What type of governor maintains the same speed from 'no load' to 'full load' conditions?
What type of governor maintains the same speed from 'no load' to 'full load' conditions?
What is the term for the difference between the pressure at a point being measured and that of a perfect vacuum?
What is the term for the difference between the pressure at a point being measured and that of a perfect vacuum?
At what temperature does water vapor in the atmosphere begin to condense?
At what temperature does water vapor in the atmosphere begin to condense?
What is the primary function of lubricating oil in an engine?
What is the primary function of lubricating oil in an engine?
What is the role of the flywheel in an engine?
What is the role of the flywheel in an engine?
What is the purpose of the crankcase in an engine?
What is the purpose of the crankcase in an engine?
What occurs to the volume of a gas when heated at constant pressure?
What occurs to the volume of a gas when heated at constant pressure?
Which of the following is NOT a mode of heat transfer that requires physical contact?
Which of the following is NOT a mode of heat transfer that requires physical contact?
What is the principle that states that energy cannot be created or destroyed?
What is the principle that states that energy cannot be created or destroyed?
What is the product of the mass of a body and its rate of acceleration?
What is the product of the mass of a body and its rate of acceleration?
What defines the capacity of a physical system to perform work?
What defines the capacity of a physical system to perform work?
Which of the following is an example of a series of the same events repeated regularly?
Which of the following is an example of a series of the same events repeated regularly?
What is the mode of heat transfer that involves the motion of heated fluid?
What is the mode of heat transfer that involves the motion of heated fluid?
What is the law that states that a physical system cannot create energy, but can only convert it from one form to another?
What is the law that states that a physical system cannot create energy, but can only convert it from one form to another?
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Study Notes
Thermodynamics
- When a gas is heated at constant pressure, its volume will increase.
- The principle that states "energy cannot be created nor destroyed" is known as the First Law of Thermodynamics, or the Law of Conservation of Energy.
- Energy is the capacity of a physical system to perform work.
- Radiation is a mode of heat transfer that does not require any physical contact between a warmer and a cooler substance.
Heat Transfer
- Convection is the transfer of heat energy through the motion of heated fluid.
- Conduction is the transfer of heat energy through direct contact between particles or objects.
- Radiation is the transfer of heat energy through electromagnetic waves.
Engine Operation
- A cycle refers to a series of the same events repeated regularly.
- In diesel engine operation, the time period between fuel injection and ignition is usually described as the ignition delay.
- The purpose of the piston ring clearance in diesel engines is to prevent the ring from buckling and breaking.
Diesel Engine Components
- The piston is referred to as the "heart of the engine".
- The part of the engine that transmits to the crankshaft the power developed by the burning of the fuel is the connecting rod.
- The stroke is the distance traveled by the piston from one end of the cylinder to the other end.
- The crankshaft is the part of the engine that strokes kinetic energy that helps the starting process.
Engine Governors
- The governor is the part of the diesel engine that keeps the engine running at desired speed regardless of load.
- Constant-speed governors maintain the same speed from "no load" to "full load" conditions.
Pressure and Temperature
- The difference between the pressure at a point being measured and that of a perfect vacuum is known as the absolute pressure.
- The temperature at which water vapor in the atmosphere begins to condense is called the dew point temperature.
Lubrication
- The function of lubricating oil is to maintain a pressurized fluid film between moving surfaces.
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