Deck 9: Automotive Engine Designs and Diagnosis

Question 1

The volume of the combustion chamber when the piston is at BDC divided by the volume of the chamber when the piston is at TDC is called _____.

A)displacement
B)compression ratio
C)volumetric efficiency
D)mechanical efficiency

Answer 1

B

Question 2

Which engine problem may be indicated by good results from a compression test and a cylinder leakage test coupled with poor results from a cylinder power balance test?

A)incorrect valve timing
B)collapsed lifter
C)burnt intake valve
D)worn piston rings

Answer 2

B

Question 3

Some diesel engines operate on the two-stroke cycle principle.

Answer 3

True

Question 4

What is compression ratio?

A)the diameter of the cylinder
B)the cylinder arrangement
C)the ratio of the air to fuel mixture
D)None of the answers is correct.

Question 5

All transverse engine layouts are associated with front-wheel drive.

Question 6

Which one of the following is NOT a stroke of the four-stroke cycle?

A)intake
B)compression
C)ignition
D)exhaust

Question 7

As seen from the flywheel end, nearly all engines rotate clockwise.

Question 8

Oversquare engines are capable of running at higher speeds and can have larger valves than undersquare engines.

Question 9

The stroke of an engine is _____ that of a crankshaft throw.

A)half
B)twice
C)four times
D)equal to

Question 10

The component connected to the crankshaft that stores some of the engine's power is the _____.

A)flywheel
B)connecting rod
C)piston
D)main bearing

Question 11

On a 4-cylinder engine that has a firing order of 1342, if number 1 cylinder is on the exhaust stroke, what stroke is number 3 cylinder on?

A)intake
B)compression
C)power
D)exhaust

Question 12

Lack of combustion is always caused by a fault in the ignition system.

Question 13

There is no such thing as a W engine configuration.

Question 14

The camshaft can be located either in the cylinder block or in the cylinder head.

Question 15

A high engine compression ratio usually requires high octane fuel.

Question 16

The stratified charge engine combines the features of both the gasoline and diesel engines.

Question 17

Gasoline and diesel engines are classified as external combustion engines.

Question 18

The flywheel stores some of the power produced by the engine during the power stroke to keep the pistons in motion during the exhaust, intake, and compression strokes.

Question 19

Engine torque always increases with engine rpm.

Question 20

To complete a four-stroke cycle in one cylinder, the crankshaft must rotate _____ degrees.

A)180
B)360
C)540
D)720

Question 21

How many degrees of crankshaft rotation does it take to complete one complete engine cycle in a 4-stroke engine?

A)90
B)180
C)360
D)720

Question 22

What type of ICE engine listed below is commonly found in a hybrid vehicle?

A)two-stroke
B)rotary
C)diesel
D)Atkinson

Question 23

The reciprocating movement of the piston is converted into rotary motion by the _____.

A)crankshaft and connecting rod
B)intermediate shaft
C)flywheel
D)camshaft

Question 24

A four-stroke cycle engine requires at least _____ valves at the top of each cylinder.

A)one
B)two
C)three
D)four

Question 25

Which V-type engine valve train design may use four camshafts?

A)OHC
B)DOHC
C)OHV
D)DOHV

Question 26

Diesel engines are being discussed. Technician A says diesel engines have a distributor-type injection pump. Technician B says diesel engines have a common fuel rail and the injectors are controlled by the computer. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 27

Engine oil pressure testing is being discussed. Technician A says that oil pressure should be tested with the engine cold. Technician B says oil with viscosity that is too high may cause lower than specified pressure. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 28

Technician A says the engine displacement can be found on the engine ID tag. Technician B says the date the engine was assembled can be found in the casting numbers on the cylinder block. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 29

Two technicians are discussing diesel engines. Technician A says all diesel engines are fuel injected. Technician B says glow plugs help ignite the fuel when the engine is cold. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 30

A wet compression test is performed on an engine after a dry compression test revealed low compression on one cylinder. If the compression on the low cylinder rises, it indicates _____.

A)leaking valves
B)worn rings
C)a worn camshaft lobe
D)a cracked piston

Question 31

The ____________________ controls the movement of the valves.

Question 32

Technician A says weak valve springs can be detected with a vacuum test. Technician B says a restricted exhaust can be detected with a vacuum test. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 33

Technician A says engine displacement is commonly measured in cubic millimeters. Technician B says it is commonly measured in cubic inches. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 34

Front engine, longitudinal layout is being discussed. Technician A says this layout is used in rear-wheel drive vehicles. Technician B says this layout is used in some front-wheel drive vehicles. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 35

In what type of engine is the intake valve held open longer than normal during the compression stroke?

A)Wankel
B)Atkinson cycle
C)two-stroke
D)diesel

Question 36

The largest part of the engine is the ____________________.

Question 37

What component of the engine determines the stroke?

A)the cylinder block
B)the pistons
C)the connecting rods
D)the crankshaft

Question 38

Both valves are closed on the _____ strokes.

A)power and exhaust
B)intake and exhaust
C)intake and compression
D)compression and power

Question 39

Two technicians are discussing compression testing on a hybrid vehicle equipped with an Atkinson cycle engine. Technician A says the compression reading of an Atkinson cycle engine is normally higher than a conventional engine. Technician B says a scan tool may be needed to perform the compression test. Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 40

How can cam timing be checked?

A)using a lab scope
B)checking the timing marks
C)both A and B
D)neither A nor B

Question 41

A crankshaft changes ____________________ motion to ____________________ motion.

Question 42

____________________ plugs are used to warm the combustion chamber of a cold diesel engine.

Question 43

A cylinder leakage test measures the amount of leakage in the cylinder as a(n)____________________.

Question 44

Describe an inline engine.

Question 45

Identify four types of fuel currently used in automotive engines.

Question 46

What is detonation?

Question 47

The crankshaft rotates ____________________ degrees in one piston stroke.

Question 48

A(n)____________________ vehicle is one that uses an electric motor and a gasoline engine to move the vehicle.

Question 49

Identify safety concerns when listening for engine noises with a stethoscope.

Question 50

The rotary engine is also known as a(n)____________________ engine.

Question 51

A(n)____________________ mounted engine sits sideways in the engine compartment.

Question 52

____________________ lobes open and close the engine valves.

Question 53

____________________ is the amount of power that an engine produces when tested on a dynamometer at a specific speed at full throttle.

Question 54

Describe the four-stroke cycle.

Question 55

Describe the difference between torque and horsepower.

Question 56

Describe an overhead valve engine.

Question 57

Describe a mid-engine transverse engine layout.

Question 58

Describe rod bearing noise.

Question 59

A ____________________ test is used to detect if all the cylinders are producing the same amount of power

Question 60

Describe the process of combustion.

Question 61

Name four things that could cause unequal cylinder power balance.

Question 62

What is the problem with incorrect valve timing?