CO Evaluation

1. What is the first stroke of a diesel engine's four-stroke cycle?

• a) Exhaust stroke

• b) Compression stroke

• c) Intake stroke

• d) Power stroke

2. During which stroke is air drawn into the cylinder in a four-stroke diesel engine?

• a) Exhaust stroke

• b) Compression stroke

• c) Intake stroke

• d) Power stroke

3. In the compression stroke of a four-stroke diesel engine, what is the position of the intake valve?

• a) Open

• b) Closed

• c) Half-open

• d) Not relevant during this stroke

4. In which stroke does fuel injection occur in a diesel engine?

• a) Exhaust stroke

• b) Compression stroke

• c) Intake stroke

• d) Power stroke

5. What is the position of exhaust valve during exhaust stroke?

• a) Open

   

• b) Closed

   

• c) Half-open

   

• d) Not relevant during this stroke

   

6. What is the primary function of the power stroke in a diesel engine?

• a) To compress the air-fuel mixture

• b) To exhaust the burnt gases

• c) To produce power by combustion

• d) To draw in air

7. What happens to the piston during the compression stroke?

• a) It moves downward

• b) It remains stationary

• c) It moves upward to compress the air

• d) It moves up and down rapidly

8. In a four-stroke diesel engine, how many revolutions of the crankshaft does it take to complete one full cycle?

• a) One

• b) Two

• c) Four

• d) Three

9. What is the purpose of the intake valve during the intake stroke in a diesel engine?

• a) To release exhaust gases

• b) To allow air to enter the cylinder

• c) To compress the air-fuel mixture

• d) To inject fuel into the cylinder

10. Which stroke in the diesel engine four-stroke cycle has the highest temperature?

• a) Exhaust stroke

• b) Power stroke

• c) Compression stroke

• d) Intake stroke