Exercises for Unit 1

1. An engine is a device that converts what type of energy into kinetic energy?

A. Reciprocating
B. Physical
C. Heat
D. Kinetic

2. (True or False) In a four-stroke-cycle gasoline engine, a cycle occurs during four revolutions of the crankshaft.

A. True
B. False

3. A one-cylinder engine consists of how many basic parts?

A. 6
B. 4
C. 3
D. 1

4. For a vehicle to move, reciprocating motion must be changed to what type of motion?

A. Back and forth
B. Rotary
C. Angular
D. Linear

5. The movement of a piston from top to bottom or from bottom to top is known as _____.

.A. top dead center
B. bottom dead center
C. timing
D. stroke

6. What is the definition of top dead center?

A. The position of the piston just before its motion changes from up to down.
B. The position of the piston at the instant its motion changes from up to down.
C. The position of the piston just after its motion changes from up to down.
D. The position of the piston at the instant its motion changes from down to up.

7. How many times will the crankshaft rotate on one complete cycle of a two-stroke engine?

A. 4
B. 3
C. 2
D. 1

8. What is the reaction that occurs when the fuel and air mixture is ignited in the engine cylinder?

A. Combustion
B. Explosion
C. Detonation
D. Convulsion

9. The connecting rod transmits the reciprocating motion of the cylinder to the ______.

.A. camshaft
B. crankshaft
C. connecting shaft
D. rod shaft

10. The Most common method to classify an engine is by the _____.

A. cooling method used
B. fuel burned
C. number of cylinders
D. arrangement of cylinders

11. During the intake stroke in a four-stroke gasoline engine, what condition causes the fuel and air mixture to enter the combustion chamber?

A. Compression
B. Vacuum
C. Combustion
D. Expansion

12. In a horizontal-opposed engine, the cylinders are arranged at what number of degrees from each other?

A. 270
B. 180
C. 90
D. 45

13. In a four-stroke diesel engine, where do air and fuel mix?

A. Combustion chamber
B. Injection chamber
C. Catalytic converter
D. Intake manifold

14. A direct injection fuel system operates up to how many psi?

A. 30,000
B. 20,000
C. 3,000
D. 2,000

15. Which type of fuel injection is most common on diesel engines?

A. Indirect
B. Direct
C. Swirl
D. Direct combustion

16. Which is the only fuel injection system that was designed to be electronically controlled?

A. Pressure-time injection
B. Common rail injection
C. Unit injector
D. Distributor pump

17. A diesel engine has greater torque than a gasoline engine because of the power developed from the _____.

A. high-compression ratio
B. high-heat transfer
C. low-compression ratio
D. low-heat transfer

18. Gasoline uses what rating system to determine its combustion ability?

A. Cetane
B. Ratio
C. Octane
D. Fathom

19. Diesel fuel uses what rating system to determine its combustion ability?

A. Cetane
B. Ratio
C. Octane
D. Fathom

20. (True or False) A single gallon of Diesel fuel contains more heat than a single gallon of gasoline.

A. True
B. False

21. (True or False) Diesel fuel contains wax.

A. True
B. False

22. (True or False) The water pump draws coolant from the bottom of the radiator.

A. True
B. False

23. (True or False) The cooling system warms up the engine to its normal operating temperature.

A. True
B. False

24. On a cold engine, what restricts the circulation of coolant?

A. Shutter
B. Overflow tank
C. Water jacket
D. Thermostat

25. The _____ is mounted in series with the lower radiator hose and is used to supply extra room for coolant.

A. overflow tank
B. reservoir tank
C. expansion tank
D. extortion tank

26. The cooling action on air-cooled engines is based on what principle?

A. Incoming airflow is cooler than the engine metal.
B. Incoming airflow is cooler than the coolant.
C. Incoming airflow is easier to control than coolant.
D. Incoming airflow is easier to control than engine heat.

27. When does the radiator vacuum valve open?

A. When the pressure in the cooling system raises above the outside air pressure.
B. When the pressure in the cooling system drops below the outside air pressure.
C. When the pressure in the cooling system exceeds its maximum limit.
D. When the pressure in the cooling system drops below the normal pressure.

28. Which radiator system part provides more cooling area and aids in directing airflow when the vehicle is not moving?

A. Fan
B. Fins
C. Baffles
D. Shroud

29. How is piston displacement calculated?

A. Add bore and stroke
B. Divide stroke by bore
C. Multiply stroke by bore
D. Divide bore by stroke

30. Turbo-charged and supercharged engines need a lower _____.

A. compression aspect
B. intake ratio
C. compression ratio
D. intake aspect

31. What are the two possible locations of a camshaft in an engine?

A. Block and crankcase
B. Block and head
C. Head and intake
D. Block and intake

32. As the engine speeds up, the timing needs to _____.

A. be retarded
B. be advanced
C. remain steady
D. be rotated