Deck 9: Automotive Engine Designs and Diagnosis

Question 1

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

Answer 1

True

Question 2

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

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

Answer 2

B

Question 3

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

Answer 3

True

Question 4

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

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

Question 5

There is no such thing as a W engine configuration.

Question 6

A high engine compression ratio usually requires high octane fuel.

Question 7

Gasoline and diesel engines are classified as external combustion engines.

Question 8

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

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

Question 9

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

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

Question 10

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

Question 11

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 12

What is compression ratio?

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

Question 13

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

Question 14

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

Question 15

Engine torque always increases with engine rpm.

Question 16

Nearly all engines rotate clockwise (as seen from the flywheel end).

Question 17

Which of the following engine problems may be indicated by good results from a compression test and a cylinder leakage test but poor results from a cylinder power balance test?

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

Question 18

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

Question 19

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 20

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

Question 21

The largest part of the engine is the ____________________.

Question 22

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 23

What component of the engine determines the stroke?

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

Question 24

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 25

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 26

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

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

Question 27

Both valves are closed on the _____ strokes.

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

Question 28

The ____________________ controls the movement of the valves.

Question 29

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) worn camshaft lobe
D) all answers are correct

Question 30

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 31

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 32

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

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

Question 33

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 34

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 35

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

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

Question 36

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

Question 37

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 38

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 39

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 40

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 41

Describe an overhead valve engine.

Question 42

Describe a mid-engine transverse engine layout.

Question 43

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

Question 44

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

Question 45

A cylinder leakage test measures the amount of leakage in the cylinder in ____________________.

Question 46

Identify four types of fuel currently used in automotive engines.

Question 47

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

Question 48

A crankshaft changes ____________________ motion to ____________________ motion.

Question 49

Describe the four-stroke cycle.

Question 50

What is detonation?

Question 51

____________________ lobes open and close the engine valves.

Question 52

Name four things that could cause unequal cylinder power balance.

Question 53

Describe the process of combustion.

Question 54

Describe rod bearing noise.

Question 55

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

Question 56

Describe the difference between torque and horsepower.

Question 57

Describe an inline engine.

Question 58

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

Question 59

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

Question 60

The crankshaft rotates ____________________ degrees in one piston stroke.