Automotive Test Questions (Engines)

Front 1

older cars had heavy frames, but most cars are built today with what is known as a unibody design

Back 1

true

Front 2

in a spark-ignition engine, gasoline is especially combustible when one part of it is atomized with about 15 parts of air

Back 2

true

Front 3

liquid gasoline does not burn

Back 3

true

Front 4

on vintage engines, a fuel injection system mixes fuel and air in response to how much air is flowing through it

Back 4

false, carburatours do

Front 5

gasoline engines do not have spark plugs or an ignition system, like diesel engines. Instead, they rely on the injection system for ignition timing

Back 5

false

Front 6

a fire extinguisher is a portable tank that contains water or foam, a chemical, or a gas

Back 6

true

Front 7

keeping oily materials separated from air prevents them from self-igniting, a process called greaseweep

Back 7

false, spontaneous combustion

Front 8

cold fuel spray can cause a bulb to shatter and the hot filament can start a very dangerous fuel fire

Back 8

true

Front 9

a material is considered hazardous if it caused illness, injury, or death or pollutes water, air, or land

Back 9

true

Front 10

The VIN is required to include 21 digits

Back 10

false, 17digits

Front 11

vehicles produced since 1962 are equipped with an underhood emission control label

Back 11

false, 1972

Front 12

comprehensive generic repair manuals include sections for each make of car arranged in alphabetical order by maker

Back 12

true

Front 13

sometimes an owner's manual contains instructions for maintenance for owners who want to do some of the maintenance themselves

Back 13

true

Front 14

AllData covers vehicles from the 1962 model year to the present

Back 14

false, 1982

Front 15

an advantage to frame-contact, axle engaging, or pad lifts is that the wheels hang free, which makes it easier to perform tire, brake, and suspension work

Back 15

true

Front 16

lift pads should face either toward each other or away fromeach other to form a 'V' or an 'A'

Back 16

true

Front 17

drive-over lifts are more open in the center to allow easier access to the underside of the vehicle

Back 17

true

Front 18

aerated oil does not provide for sufficient oil pressure and can result in collapsed hydraulic lifters, or even a broken crankshaft

Back 18

true

Front 19

viscosity, which is measured at 212F (100C), is lower if the oil is thicker

Back 19

false, higher if the oil is thicker

Front 20

oil normally thins out when heated

Back 20

true

Front 21

as an engine wears, clearance between its crankshaft and bearings decrease

Back 21

false, clearance increases

Front 22

SA an SB graded oils are good only for very light-duty applications and are obsolete for automotive engines, although they are sometimes found on market shelves

Back 22

true

Front 23

a complete brake inspection is usually included in a lube service

Back 23

false

Front 24

the brake system is required by law to include a parking brake (also called emergency brake) that operates independently of the hydraulic service brakes

Back 24

true

Front 25

drum brakes should always be adjusted before attempting to adjust the emergency brake

Back 25

true

Front 26

fluid level is checked with the engine on

Back 26

false, engine off

Front 27

dirt is the number 1 cause of engine failure

Back 27

true

Front 28

overinflation results in excessive outer tread wear

Back 28

false, center tread wear

Front 29

do not lubricate rubber parts with oil; it will rapidly deteriorate a rubber bushing

Back 29

true

Front 30

worn ball joints or other front suspension parts that cause looseness can result in cupped wear of the tire tread

Back 30

true

Front 31

the wheels must be suppotred when removing shocks from rear-wheel-drive cars with coil springs

Back 31

true

Front 32

on front-wheel drive cars, a differential is located between the rear wheels

Back 32

false

Front 33

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

Back 33

true

Front 34

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

Back 34

false

Front 35

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

Back 35

false

Front 36

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

Back 36

true

Front 37

intake and exhaust valves are made of the same materials

Back 37

false

Front 38

an in-line engine has all of its cylinders lined up in one row

Back 38

true

Front 39

air-cooled engines are found on lawnmowers, and some automobiles

Back 39

true

Front 40

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

Back 40

false

Front 41

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

Back 41

false

Front 42

hybrid electric vehicles (HEVs) overcome some of the shortcomings of EVs by combining the electric motor(s) with one or more sdditional power sources

Back 42

true

Front 43

an engine's size is determined by the volume of air that its pistons displace in the cylinders

Back 43

true

Front 44

the comperssion ratio determines how much the air and fuel are compressed on the compressiion stroke

Back 44

true

Front 45

inertia is the ability to make power,, and is defined as the tendency of force to rotate a body on which it acts

Back 45

false

Front 46

heat is measured in British thermal units(Btu)

Back 46

true

Front 47

engine dynamometers are used in emission control testing programs because testing of oxides of nitrogen can only be done when the engine is under load

Back 47

false

Front 48

modern aluminum pistons have high silicon content that causes them to wear out the piston ring

Back 48

true

Front 49

cylinder bores, core plug holes, and valve guides and stems cannot be oversize

Back 49

false

Front 50

without dowels, damage, especially to an automatic transmission flexplate, can occur in a short period of time

Back 50

true

Front 51

crasshatching that is too steep (less than 60 degrees) will allow oil to run down the cylinder wall; too flat (more than 20 degrees) causes too thick an oil film

Back 51

false

Front 52

The ___ determines how well an engine breathes at a particular engine rpm... a.umbrella b.camshaft c.lifter d.timing belt

Back 52

b. camshaft

Front 53

All of the following statements are true except: a)solid cams have a clearance ramp at the beginning and end of each lobe b)a high performance camshaft will have high engine vacuum at idle c)advanced cam timing improves low and mid-range torque d)retarded cam timing improves high rpm power

Back 53

B. a high performance camshaft will have high engine vacuum at idle

Front 54

While discussing bearing undersizes, tech A says that undersized bearings are used when a crankshaft is reground. Tech B says that they are used on some new engines tgo compensate for errors in production. Who is right? a)A only b) B only c) both A & B d) neither A nor B

Back 54

C. both A & B

Front 55

which of the following statements is least likely true? a)servicing valve guides before seat refinishing will result in an off center valve seat that must be reground or cut b)exhaust seats are wider than intake seats because valve cooling is critical c)a valve that is off center will leak, causing a rough idle when cold d)valve guides must be refinished before attempting to refinish valve seats

Back 55

A) servicing valve guides before seat refinishing will result in an off center valve