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55 Cards in this Set
- Front
- Back
older cars had heavy frames, but most cars are built today with what is known as a unibody design
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true
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in a spark-ignition engine, gasoline is especially combustible when one part of it is atomized with about 15 parts of air
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true
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liquid gasoline does not burn
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true
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on vintage engines, a fuel injection system mixes fuel and air in response to how much air is flowing through it
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false, carburatours do
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gasoline engines do not have spark plugs or an ignition system, like diesel engines. Instead, they rely on the injection system for ignition timing
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false
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a fire extinguisher is a portable tank that contains water or foam, a chemical, or a gas
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true
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keeping oily materials separated from air prevents them from self-igniting, a process called greaseweep
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false, spontaneous combustion
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cold fuel spray can cause a bulb to shatter and the hot filament can start a very dangerous fuel fire
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true
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a material is considered hazardous if it caused illness, injury, or death or pollutes water, air, or land
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true
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The VIN is required to include 21 digits
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false, 17digits
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vehicles produced since 1962 are equipped with an underhood emission control label
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false, 1972
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comprehensive generic repair manuals include sections for each make of car arranged in alphabetical order by maker
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true
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sometimes an owner's manual contains instructions for maintenance for owners who want to do some of the maintenance themselves
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true
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AllData covers vehicles from the 1962 model year to the present
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false, 1982
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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
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true
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lift pads should face either toward each other or away fromeach other to form a 'V' or an 'A'
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true
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drive-over lifts are more open in the center to allow easier access to the underside of the vehicle
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true
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aerated oil does not provide for sufficient oil pressure and can result in collapsed hydraulic lifters, or even a broken crankshaft
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true
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viscosity, which is measured at 212F (100C), is lower if the oil is thicker
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false, higher if the oil is thicker
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oil normally thins out when heated
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true
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as an engine wears, clearance between its crankshaft and bearings decrease
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false, clearance increases
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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
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true
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a complete brake inspection is usually included in a lube service
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false
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the brake system is required by law to include a parking brake (also called emergency brake) that operates independently of the hydraulic service brakes
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true
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drum brakes should always be adjusted before attempting to adjust the emergency brake
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true
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fluid level is checked with the engine on
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false, engine off
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dirt is the number 1 cause of engine failure
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true
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overinflation results in excessive outer tread wear
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false, center tread wear
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do not lubricate rubber parts with oil; it will rapidly deteriorate a rubber bushing
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true
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worn ball joints or other front suspension parts that cause looseness can result in cupped wear of the tire tread
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true
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the wheels must be suppotred when removing shocks from rear-wheel-drive cars with coil springs
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true
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on front-wheel drive cars, a differential is located between the rear wheels
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false
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a simple reciprocating engine has a cylinder, a piston, a connecting rod, and a crankshaft
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true
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when the air-fuel mixture is measured by volume, there are 100,000 gallons of air for each gallon of gasoline
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false
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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
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false
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the term combustion chamber refers to the small chambers in the cylinder heads that are located just above the pistons
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true
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intake and exhaust valves are made of the same materials
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false
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an in-line engine has all of its cylinders lined up in one row
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true
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air-cooled engines are found on lawnmowers, and some automobiles
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true
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the cam-in-block engine is called an overhead cam engine and the cam-in-head design is called a pushrod engine
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false
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automotive rotary engines have four rotors that rotate inside of a chamber that looks like a modified figure eight
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false
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hybrid electric vehicles (HEVs) overcome some of the shortcomings of EVs by combining the electric motor(s) with one or more sdditional power sources
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true
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an engine's size is determined by the volume of air that its pistons displace in the cylinders
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true
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the comperssion ratio determines how much the air and fuel are compressed on the compressiion stroke
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true
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inertia is the ability to make power,, and is defined as the tendency of force to rotate a body on which it acts
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false
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heat is measured in British thermal units(Btu)
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true
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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
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false
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modern aluminum pistons have high silicon content that causes them to wear out the piston ring
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true
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cylinder bores, core plug holes, and valve guides and stems cannot be oversize
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false
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without dowels, damage, especially to an automatic transmission flexplate, can occur in a short period of time
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true
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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
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false
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The ___ determines how well an engine breathes at a particular engine rpm... a.umbrella b.camshaft c.lifter d.timing belt
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b. camshaft
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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
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B. a high performance camshaft will have high engine vacuum at idle
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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
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C. both A & B
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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
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A) servicing valve guides before seat refinishing will result in an off center valve
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