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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?

Pre-combustion lag (correct)

Fuel injection duration

Ignition delay

Combustion lag

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?

Radiation (correct)

Combination of conduction and convection

Conduction

Convection

Which of the following tasks must be done before starting a diesel engine?

Check the crankcase oil level Signup and view all the answers

What is referred to as the 'heart of the engine'?

Crankcase Signup and view all the answers

Which part of the engine transmits to the crankshaft the power developed by the burning of the fuel?

Connecting rod Signup and view all the answers

What is defined as the distance traveled by the piston from one end of the cylinder to the other end?

Stroke Signup and view all the answers

What is the term used to describe the rotation of the crankshaft?

Revolution Signup and view all the answers

What is the function of the part of the engine that helps the starting process?

To convert kinetic energy into mechanical energy Signup and view all the answers

What is the primary purpose of a governor in a diesel engine?

To maintain a constant speed Signup and view all the answers

What type of governor maintains the same speed from 'no load' to 'full load' conditions?

Constant-speed governor Signup and view all the answers

What is the term for the difference between the pressure at a point being measured and that of a perfect vacuum?

Absolute pressure Signup and view all the answers

At what temperature does water vapor in the atmosphere begin to condense?

Dew point temperature Signup and view all the answers

What is the primary function of lubricating oil in an engine?

To maintain a pressurized fluid film between moving surfaces Signup and view all the answers

What is the role of the flywheel in an engine?

To smooth out the engine's rotation Signup and view all the answers

What is the purpose of the crankcase in an engine?

To house the crankshaft Signup and view all the answers

What occurs to the volume of a gas when heated at constant pressure?

It increases Signup and view all the answers

Which of the following is NOT a mode of heat transfer that requires physical contact?

Radiation Signup and view all the answers

What is the principle that states that energy cannot be created or destroyed?

The first law of thermodynamics Signup and view all the answers

What is the product of the mass of a body and its rate of acceleration?

Momentum Signup and view all the answers

What defines the capacity of a physical system to perform work?

Energy Signup and view all the answers

Which of the following is an example of a series of the same events repeated regularly?

Cycle Signup and view all the answers

What is the mode of heat transfer that involves the motion of heated fluid?

Convection Signup and view all the answers

What is the law that states that a physical system cannot create energy, but can only convert it from one form to another?

The law of conservation of energy Signup and view all the answers

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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