FREE EETC Four-Stroke Engines Questions and Answers

Question 1

In a two-cylinder, four-stroke engine, how many power strokes will occur in two rotations of the crankshaft?

Accepted Answer

Two

Answer

One

Answer

Three

Answer

Four

Question 2

During the intake stroke in a four-stroke engine, what are the positions of the valves?

Accepted Answer

The intake valve is open and the exhaust valve is closed

Answer

Both intake and exhaust valves are closed

Answer

The intake valve is closed and the exhaust valve is open

Answer

Both intake and exhaust valves are open

Question 3

What is used to ignite the air/fuel mixture inside the cylinder in a four-stroke engine?

Accepted Answer

A spark plug

Answer

Fuel injector

Answer

Glow plug

Answer

Compression stroke

Question 4

What causes pre-ignition in a four-stroke engine?

Accepted Answer

A hot spot in the combustion chamber

Answer

Excessive fuel pressure

Answer

Faulty spark plug

Answer

Low engine temperature

Question 5

What does a four-stroke engine primarily convert into mechanical energy?

Accepted Answer

Chemical energy to mechanical energy

Answer

Electrical energy to thermal energy

Answer

Mechanical energy to chemical energy

Answer

Potential energy to kinetic energy

Question 6

What is the most likely cause of a broken compression ring in a four-stroke engine?

Accepted Answer

Detonation

Answer

Overheating

Answer

Poor lubrication

Answer

Valve timing issues

Question 7

What is the primary cause of the permanent breakdown of oil film strength in a four-stroke engine?

Accepted Answer

Shearing of the oil layers

Answer

Contamination by debris

Answer

Excessive heat exposure

Answer

Chemical degradation

Question 8

Which of the following factors may affect the operating temperature of an air-cooled engine?

Accepted Answer

All of the above

Answer

Engine oil quality/quantity

Answer

Spark plug heat range

Answer

Carburetor jetting

Question 9

How many revolutions of the crankshaft are required to complete one power cycle in a four-stroke engine?

Accepted Answer

Two revolutions

Answer

One revolution

Answer

Three revolutions

Answer

Four revolutions

Question 10

How many camshaft revolutions are equivalent to one revolution of the crankshaft in a four-stroke engine?

Accepted Answer

Half

Answer

One

Answer

Two

Answer

Double