Exam 1: Engine Operation

The camshaft controls the rate at which the engine breathes.

In a four stroke, four cylinder engine, how many degrees must the crankshaft turn before the next cylinder in the firing order is fired?

Most of today's cars are powered by _____-cycle engines.

An eight-cylinder engine has a 1 8 4 3 6 5 7 2 firing order. Technician A says that cylinder number 3 is cylinder number 1's companion. Technician B says that cylinder number 5 is cylinder number 8's companion. Who is right?

What cylinder arrangement is popular with designers when an engine has more than four cylinders?

Which of the following is NOT an Otto-cycle engine?

How many degrees is a complete cycle on a four stroke engine?

Two technicians are discussing "blowby." Technician A says that "blowby" is gases escaping past the valves. Technician B says that "blowby" is gases escaping past the rings. Which technician is correct?

The gasoline engine is also known as a spark ignition engine.

Two technicians are discussing the power stroke. Technician A says that on a V8 engine, a power stroke occurs every 90 degrees. Technician B says that on an inline six-cylinder engine, the power stroke occurs every 120 degrees. Which technician is correct?

What is a complete engine assembly called?

Technician A says that an in-line six cylinder engine is usually longer and heavier than a V8 engine of the same displacement. Technician B says that there are twice as many teeth on the crankshaft sprocket as there are on the camshaft sprocket. Who is right?​

Technician A says that diesel engines have compression ratios that are about twice as high as those found in gas engines. Technician B says that diesel engines require less maintenance than gasoline engines. Who is right?

Technician A says that most automotive gasoline engines have four strokes per cycle. Technician B says that the crankshaft makes four revolutions during the four-stroke cycle. Which technician is correct?

In four stroke engine operation, gasoline will not burn unless it is mixed with the correct amount of air.

What does OHC mean?

Technician A says that the I-head engine is widely used in automobiles because it can breathe better than earlier engine designs. Technician B says that increased valve lift is possible with an I-head engine. Which technician is correct?

Technician A says that "blowby" consists of gases that leak past the valves. Technician B says that blowby reduces the pressure in the crankcase. Who is right?

What are four other names for a core plug?

How many times in 1 second will a valve open in an engine running at 6000 rpm?