Question 1

When the air-fuel mixture is measured by volume, there are 100,000 gallons of air for each gallon of gasoline.

Accepted Answer

When the air-fuel mixture is measured by volume, there are approximately 14.7 gallons of air for each gallon of gasoline.

Question 2

The part that will MOST-Likely be used to close the valve after it has been opened by the cam lobe is the:

Accepted Answer

The valve spring provides the necessary force to close the valve after it has been opened by the cam lobe. The valve margin and stem are components of the valve itself and do not directly contribute to closing the valve. The valve port is the opening in the cylinder head through which the valve moves and does not play a role in closing the valve.

Question 3

The front of an engine has all of the following EXCEPT:

Accepted Answer

The front of an engine typically contains the timing cover or front cover, camshaft drive, and crankshaft vibration damper. The valve train is typically located inside the engine, not on the front.

Question 4

While discussing pulleys, Technician A says that some engines use a vibration damper to minimize vibrations in the crankshaft that could cause it to crack or break. Technician B says that some engines do not use a damper. Instead they have a single-piece pulley with threaded holes to attach the drive belt pulley(s). Who is correct?

Accepted Answer

Both technicians are partially correct. Some engines do use a vibration damper to minimize crankshaft vibrations, but others use a single-piece pulley with threaded holes for the drive belt pulley(s). It ultimately depends on the design and specifications of the engine.

Question 5

One mole of air weighs approximately ____________________ ounce(s).

Accepted Answer

The answer of One mole of air weighs approximately ____________________...

Question 6

Which of the following parts is LEAST-Likely to be included in the valve train?

Accepted Answer

The piston is part of the engine's combustion chamber and is not directly related to the operation of the valve train. The valve train components include the camshaft, rocker arms, and pushrods, which work together to open and close the engine's valves.

Question 7

____________________ are machined surfaces that ride inside of cam bearings. On pushrod engines, cam bearings are pressed into bores in the block.

Accepted Answer

The answer of ____________________ are machined surfaces that ride inside...

Question 8

The term combustion chamber refers to the chambers in the cylinder heads that are located just above the pistons.

Accepted Answer

The combustion chamber is located in the cylinder heads, not in the pistons.

Question 9

____________________ are mounted on top of the cylinder head. They take the up-and-down motion of the pushrod and transfer it to the valve.

Accepted Answer

The answer of ____________________ are mounted on top of the...

Question 10

The short block for a pushrod engine includes all of the following EXCEPT:

Accepted Answer

The head gasket is part of the cylinder head, which is not included in the short block.

Question 11

Leakage past the piston rings is called ____.

Accepted Answer

Leakage past the piston rings is called blowby. None of the other options refer to this specific issue.

Question 12

The area of the block where the crankshaft and bearings are located is called the ____.

Accepted Answer

The crankshaft and bearings are located in the crankcase, which is the area of the engine block that encloses the crankshaft and connects it to the cylinder head. The other options are not specific to this area of the engine block.

Question 13

The cam-in-block style, with two valves per cylinder, is called a(n) ____________________.

Accepted Answer

The answer of The cam-in-block style, with two valves per...

Question 14

While discussing manifolds, Technician A says that exhaust manifolds must carry very hot exhaust gases so they are usually made of cast iron. Technician B says that some manifolds are constructed of steel tubing. Who is correct?

Accepted Answer

Both technicians are correct. Exhaust manifolds can be made of cast iron or steel tubing, depending on the specific application and design specifications. While cast iron is a common material for exhaust manifolds because it can handle the high temperatures and corrosive gases, steel tubing can be used for custom or high-performance applications where weight reduction and improved exhaust flow are priorities.

Question 15

A fuel injection system supplies fuel to join with the air that flows through the ____________________ of the manifold.

Accepted Answer

The answer of A fuel injection system supplies fuel to...

Question 16

Most vehicles since the early 1960s have fuel injection systems with computer controls. The computer monitors the oxygen content in the vehicle's exhaust and then adjusts the fuel supply to provide the correct amount of fuel and air for each intake stroke.

Accepted Answer

Most vehicles since the early 1980s, not the 1960s, have fuel injection systems with computer controls. Before that, carburetors were more common for mixing fuel and air.

Question 17

The space where the ends of the piston ring come together when the ring is installed in the cylinder is MOST-Likely referred to as a(n):

Accepted Answer

The space where the ends of the piston ring come together when the ring is installed in the cylinder is called the end gap. Flywheel is a component that is used to store energy, flexplate is used in automatic transmissions to connect the engine to the transmission, and oil gap is not a commonly used term in engine terminology.

Question 18

A simple reciprocating engine has a cylinder, a piston, a connecting rod, and a crankshaft.

Accepted Answer

This is a basic description of a reciprocating engine, which is commonly used in many types of vehicles and machinery.

Question 19

Intake and exhaust valves are made of the same materials.

Accepted Answer

Intake and exhaust valves are not made of the same materials. Intake valves are typically made of materials that can withstand higher temperatures, such as steel, while exhaust valves are often made of materials with better heat dissipation, such as stainless steel or titanium.

Question 20

Which of the following is LEAST-Likely to be included in the engine's four-stroke cycle?

Accepted Answer

There is no such thing as an "inertia stroke" in the four-stroke cycle of an engine. The correct strokes are the intake, compression, power, and exhaust strokes.

Quiz 15: Introduction to the Engine