Deck 16: Engine Classifications and Types

Question 1

Air-cooled engines are found on lawnmowers, motorcycles, and some older automobiles.

Answer 1

True

Question 2

____________________ is the comparison between the volume of the cylinder and combustion chamber when the piston is at TDC and BDC.

Answer 2

Compression ratio

Question 3

Two-stroke engines have a power stroke during each revolution of the crankshaft.

Answer 3

True

Question 4

Automotive rotary engines have four rotors that rotate inside of a chamber that looks like a modified figure eight.

Question 5

The engine that is MOST-Likely to have two separate cam lobes to operate its intake and exhaust valves in each cylinder is:

A)single overhead cam (SOHC)
B)a pushrod engine
C)dual overhead cam (DOHC)
D)overhead cam (OHC)

Question 6

A head is called a(n) ____________________ when the intake and exhaust manifolds are on opposite sides on an in-line engine.

Question 7

All of the following statements are true EXCEPT:

A)The camshaft on I-head engines is located either in the cylinder head or in the cylinder block.
B)The cam-in-block engine, called a pushrod engine, is the more popular type of valve operating arrangement for inline engines.
C)OHC engines are popular for high-speed operation because they have fewer parts with less total weight than pushrod engines.
D)Belt-driven OHC engines have become commonplace in today's engines.

Question 8

The cylinder that is MOST-Likely to be cast with left and right cylinder banks at a 90-degree angle to each other is:

A)V4
B)V6
C)V8
D)V10

Question 9

While having a discussion about valves, Technician A says that higher compression is possible with the L-head. Technician B says that higher compression is achieved with the I-head because, unlike the L-head, the combustion chamber does not need extra volume to accommodate the valves. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 10

Which is LEAST-Likely part of a rotary engine?

A)rotor
B)poppet valve
C)spark plug
D)crankshaft

Question 11

An in-line engine has all of its cylinders aligned in one row.

Question 12

The combustion chamber shape MOST-Likely to have a squish/quench area that causes movement (turbulence) of the air-fuel mixture and cooling of the gases to prevent abnormal combustion is:

A)hemi
B)wedge
C)pent-roof
D)scalene

Question 13

The combination of two dissimilar metals promotes ____, or the creation of an electrical current.

A)carbon dioxide
B)nitrogen oxide
C)fusion
D)electrolysis

Question 14

Technician A says that some multivalve heads use control valves that cause only one intake valve to open at low rpm and another to open at higher rpm. Technician B says that other multivalve heads use two intake manifold runners per cylinder. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 15

A gasoline engine is called a(n) ____________________ engine, with an ignition system creating the spark.

Question 16

Which of the following statements is LEAST-Likely to be true?

A)A diesel engine can run at idle with a very lean air-fuel mixture and can be about one-third more efficient on fuel.
B)In diesel engines, the amount of air remains the same, and changing the fuel mixture controls speed and power.
C)Diesels are difficult to start in cold weather.
D)Diesels require less frequent oil changes than gasoline engines.

Question 17

The name ____ comes from the stratification, or layering, of different densities of air-fuel mixtures.

A)stratified charge
B)stratified combustion
C)stratified turbulence
D)stratified swirl chamber

Question 18

The cam-in-block engine is called an overhead cam engine, and the cam-in-head design is called a pushrod engine.

Question 19

A(n) ____________________ controls the flow of coolant between the engine and radiator to maintain coolant temperature at a specified level.

Question 20

Any engine with an even number of cylinders has pairs of cylinders called ____________________.

Question 21

What are the advantages of V-type cylinders?

Question 22

What are the advantages and disadvantages of the L-head engine?

Question 23

What are the disadvantages of diesel engines?

Question 24

What is the downside of electrolysis and how can it be prevented?

Question 25

List the three most common combustion chamber designs and describe their shapes.