PRIN. OF INTERNAL COMBUSTION ENGINES - OD1619 LESSON 1/PE 1
PRACTICAL EXERCISE 1
Read the scenario and respond to the requirements that follow the scenario.
SSG Fredrick has been attending an Army NCO development course for four weeks.
This week the subject has been internal combustion engines, which he understands
completely. One of his classmates, SSG Olson, is not very sure about this subject
and is nervous about the exam which is coming up in two days.
SSG Olson asks SSG Fredrick if he would mind helping him study for the exam. SSG
Fredrick agrees to help and decides that the best way to prepare SSG Olson for the
exam is to give him a pretest.
Below is a list of questions that SSG Fredrick feels will give SSG Olson a general
understanding of internal combustion engines.
a. If the engine is going to operate, the fuel and air mixture must be fed into
b. What component opens and closes the intake and exhaust valves in a timed
c. How many revolutions does the crankshaft rotate when the piston moves from top
dead center to bottom dead center?
What are the four strokes of operation in a piston engine?
e. What system ignites the fuel and air mixture in the combustion chamber at the
precise moment needed to make the engine run?
f. What type of engine is used almost exclusively in very small equipment because
it is lightweight and able to run at very high speeds due to the absence of a
mechanical valve train?