Engine Fundamentals

Question 1

What is the main principle behind a diesel engine’s operation?

Answer 1

A diesel engine operates on the principle of compression ignition.

Question 2

True or False: Diesel engines use spark plugs to ignite fuel.

Answer 2

False

Question 3

Fill in the blank: Diesel fuel has a higher _________ point than gasoline.

Answer 3

flash

Question 4

What type of cycle do diesel engines typically operate on?

Answer 4

Otto cycle

Question 5

What are the two main types of diesel engines?

Answer 5

Two-stroke and four-stroke

Question 6

Which component is responsible for injecting fuel into the combustion chamber in a diesel engine?

Answer 6

Fuel injector

Question 7

Multiple Choice: What is a common compression ratio range for diesel engines? A) 8:1 to 10:1 B) 14:1 to 25:1 C) 10:1 to 12:1

Answer 7

B) 14:1 to 25:1

Question 8

What is the purpose of the turbocharger in a diesel engine?

Answer 8

To increase the engine’s efficiency and power output.

Question 9

What is the primary advantage of using diesel fuel over gasoline?

Answer 9

Higher energy density and fuel efficiency.

Question 10

True or False: Diesel engines produce more torque than gasoline engines.

Answer 10

True

Question 11

What is the role of the piston in a diesel engine?

Answer 11

To compress the air and convert thermal energy into mechanical energy.

Question 12

Multiple Choice: Which of the following is NOT a component of a diesel engine? A) Crankshaft B) Camshaft C) Ignition coil

Answer 12

C) Ignition coil

Question 13

Fill in the blank: The process of mixing air and fuel in the combustion chamber is known as _________.

Answer 13

atomization

Question 14

What does the term ‘diesel knock’ refer to?

Answer 14

The noise produced by the rapid combustion of fuel in a diesel engine.

Question 15

What is the function of the cooling system in a diesel engine?

Answer 15

To regulate the engine temperature and prevent overheating.

Question 16

True or False: Diesel engines are generally more durable than gasoline engines.

Answer 16

True

Question 17

What is the purpose of the oil pump in a diesel engine?

Answer 17

To circulate oil for lubrication and cooling of engine components.

Question 18

What does ‘fuel economy’ refer to in the context of diesel engines?

Answer 18

The efficiency of the engine in converting fuel into distance traveled.

Question 19

Multiple Choice: Which parameter affects the performance of a diesel engine the most? A) Fuel type B) Compression ratio C) Oil viscosity

Answer 19

B) Compression ratio

Question 20

What is the typical service interval for a diesel engine oil change?

Answer 20

Every 5,000 to 10,000 miles, depending on usage.

Question 21

Fill in the blank: The ________ system helps to reduce emissions in diesel engines.

Answer 21

exhaust after-treatment

Question 22

What is the role of the intercooler in a turbocharged diesel engine?

Answer 22

To cool the compressed air before it enters the combustion chamber.

Question 23

True or False: Diesel engines can run on biodiesel.

Answer 23

True

Question 24

What is the significance of the ‘smoke point’ in diesel fuel?

Answer 24

It indicates the temperature at which the fuel begins to produce visible smoke.

Question 25

What does the acronym ‘NOx’ stand for in relation to diesel emissions?

Answer 25

Nitrogen oxides

Question 26

Multiple Choice: Which of the following factors can affect diesel engine performance? A) Altitude B) Temperature C) Both A and B

Answer 26

C) Both A and B