Small Engines Test bank A Flashcards by Samantha Roberts

What is the correct order of the strokes in a 4-stroke cycle engine?
a. intake, exhaust, compression and power
b. compression, power, exhaust and intake
c. intake, compression, power and exhaust
d. intake, power, compression and exhaust

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On the __________ stroke of an engine, the piston is going down, one valve is open and the other valve is
closed and air and fuel are being drawn into the cylinder.
a. intake
b. exhaust
c. power
d. compression

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On the __________ stroke of an engine, the piston is going up, one valve is open and the other valve is closed
and the fumes are leaving the cylinder.
a. intake
b. exhaust
c. power
d. compression

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On which two strokes are both valves closed?
a. intake and exhaust
b. compression and power
c. intake and compression
d. power and exhaust

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The intake valve is cooled by:
a. incoming air/fuel mixture
b. air circulation
c. radiator
d. oil

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The exhaust valve is difficult to cool because of:
a. the spark plug being placed directly above
it
b. incoming fuel mixture
c. hot water surrounding it
d. high temperature exhaust gases

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The exhaust valve is made of:
a. a very special steel
b. copper
c. brass
d. carbide

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A single cylinder Briggs and Stratton engine has:
a. 1 valve
b. 4 valves
c. 2 valves
d. 3 valves

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Valves have a direct effect on:
a. compression
b. displacement
c. compression ratio
d. horsepower

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If the intake valve fails in a one-cylinder engine, the engine will:
a. run poorly
b. stop
c. idle high
d. back fire

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What is the most common angle on a valve face?
a. 30 degrees
b. 60 degrees
c. 50 degrees
d. 45 degrees

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If a valve has a 45 degree face, then the seat would be:
a. 45 degrees
b. 46 degrees
c. 90 degrees
d. it doesn’t matter

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If a valve has a 30 degree face, then the seat would be:
a. 30 degrees
b. 31 degrees
c. 60 degrees
d. it doesn’t matter

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The valves open and close in a one-cylinder engine in as little as:
a. 1/50 of a second
b. 1/10 of a second
c. 1/2 of a second
d. 1 second

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Valve tappet clearance is measured by using a:
a. rule
b. micrometer
c. feeler gauge
d. caliper

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When checking the valve tappet clearance, the piston should be at the top of the __________ stroke and then a 1/4” down from there.
a. intake
b. compression
c. power
d. exhaust

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On L-head engines if the valve tappet clearance is too small, the proper clearance is obtained by:
a. grinding on the valve face.
b. grinding on the valve head.
c. grinding on the end of the valve stem.
d. grinding on the end of the tappet.

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On L-head engines if the valve tappet clearance is too big, the proper clearance can be obtained by:
a. refacing the valve
b. recutting the seat
c. lapping the valve
d. any of the above

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On overhead valve engines the valve clearance is corrected by:
a. clearance does not have to be checked
b. using a wrench and turning the adjusting
nut.
c. grinding on the end of the valve stem
d. grinding on the end of the tappet

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When checking the valve clearance on OHV engines, the clearance is checked between the valve stem and the
__________.
a. tappet
b. lifter
c. rocker arm
d. push rod

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Too little valve clearance can cause:
a. valve burning
b. a dished valve
c. a rich fuel mixture
d. a higher compression ratio

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Which of the following is not a part of a valve:
a. head
b. margin
c. face
d. tail

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Which of the following is a part of a valve?
a. lobe
b. stem
c. leg
d. tail

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The valve with the biggest size head is the:
a. intake valve
b. exhaust valve
c. compression valve
d. they are all the same size

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Valve springs must be replaced if they:
a. are bent
b. are not square
c. do not meet tension specifications
d. all of the above

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The camshaft opens and closes the:
a. intake valve
b. exhuast valve
c. intake and exhaust valves
d. reed valves

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The thickness of the margin on a new Briggs & Stratton valve is:
a. 1/64”
b. 1/32”
c. 1/16”
d. 1/8”

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Briggs & Stratton recommends that valves be replaced when the margin measures less than __________.
a. 3/64”
b. 1/16”
c. 1/32”
d. 1/64”

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Which of the following is not a type of valve failure?
a. necked
b. dished
c. burned
d. swollen

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Why are the valves more important in a one-cylinder engine than a multi-cylinder engine?
a. They are not more important in a onecylinder engine.
b. If the valves fail in a multi-cylinder engine
you only lose a portion of the power, but if
they fail in a one-cylinder engine you lose
all power.
c. The one-cylinder engines cost more.
d. The one-cylinder engines are more
powerful.

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What causes valves to stick?
a. gum accumulation
b. old oil
c. wrong viscosity of oil
d. air filter clogged

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__________ is a process where the valve face is rubbed against the valve seat using an abrasive compound in
order to produce a particular type surface.
a. honing
b. boring
c. seating
d. lapping

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Valve overlap is when both valves are:
a. closed
b. open
c. both a and b
d. neither a nor b

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A machined hole in the block through which the valve stem passes in order to align the valve and assure
accurate raising and lowering in relation to the seat is called the
a. valve tunnel
b. valve passage
c. valve guide
d. valve insert

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A ____________ must be used on each valve to hold it firmly against the seat.
a. grinding compound
b. valve spring
c. valve tappet
d. valve push rod

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Valves should be cleaned with a power wire brush and then:
a. cleaned with soap and water
b. cleaned with gasoline
c. honed
d. inspected for defects

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The difference in the angle between the valve seat and the valve face is called a/an:
a. tri-angle fit
b. angle fit
c. interference fit
d. compression fit

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Which of the following is not a part of the valve system?
a. keeper
b. retainer
c. spring
d. ring

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What is another name for a valve tappet?
a. valve lifter
b. valve lobe
c. valve shaft
d. valve pin

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What pushes against the valve tappets to make them move?
a. cam gear
b. cam lobes
c. crankshaft
d. connecting rod

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Valves that are used in a 4-stroke cycle engine to open and close the port openings are called:
a. head valves
b. reed valves
c. port valves
d. poppet valves

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The valve __________ consists of all of the components that work together to transform the rotation of the
crankshaft into the opening and closing of the valves.
a. parts
b. alignment
c. assembly
d. train

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What are the 3 main types of valve train configurations used in small gasoline engines?
a. straight valve, overhead valve, overhead
cam
b. L-head, poppet valve, reed valve
c. L-head, overhead valve, overhead cam
d. stem valve, overhead valve, reed valve

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The L-head engine is also known as the ____________ arrangement.
a. valve-in-block
b. straight
c. overhead
d. valve and spring

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In the ____________ arrangement, the camshaft is located in the crankcase and the valves are located in the
cylinder block, directly above the camshaft lobes.
a. overhead valve
b. overhead cam
c. straight valve
d. L-head

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In the ____________ arrangement, the camshaft is installed in the crankcase and the valves are installed in the cylinder head.
a. overhead valve
b. overhead cam
c. straight valve
d. L-head

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In the ____________ arrangement, both the camshaft and valve assemblies are installed in the cylinder head.
a. overhead valve
b. overhead cam
c. straight valve
d. L-head

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When referring to a type of engine, OHV stands for:
a. overhead vertical
b. overhead valve
c. outside horizontal valve
d. overhead voltage

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When referring to a type of engine, OHC stands for:
a. overhead cam
b. overhead crankshaft
c. outside horizontal cam
d. overhead carburetor

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In an overhead valve configuration, ____________transfer motion from the valve lifters to one end of the
rocker arms.
a. tappets
b. pushrods
c. valve stems
d. valve levers

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In an overhead valve configuration, where are the rocker arms installed?
a. in the block
b. to the crankshaft
c. in the cylinder head
d. in the crankcase

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The rocker arms operate like:
a. gears
b. springs
c. lifters
d. levers

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When one end of the rocker arm is pushed up, the other end pushes down on the ____________.
a. camshaft
b. crankshaft
c. valve stem
d. valve head

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In an overhead cam design, the camshaft may be positioned directly over the valves or they may be offset. If
the camshaft is offset, ____________ are added to the design to transfer motion from the camshaft to the
valves.
a. pushrods
b. lifters
c. rocker arms
d. springs

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The camshaft in an overhead cam design is usually driven by either a ________ or ________.
a. chain or gear
b. chain or belt
c. belt or gear
d. gear or shaft

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The overhead valve design as comapared to the L-head design can increase fuel efficiency by as much as
________.
a. 5%
b. 10%
c. 25%
d. 50%

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Which part of the engine must be removed before the push rods can be removed?
a. rocker arms
b. valves
c. valve springs
d. piston

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If the push rods are bent they must be:
a. sanded
b. measured with a micrometer
c. straightened
d. replaced

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Which of the following types of engines have valves and springs that are capable of being removed with your
hands without the use of tools?
a. straight valve engines
b. 2-cycle engines
c. L-head engines
d. OHV engines

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Which of the following statements is true?
a. Most valve face angles are 60 degrees
b. To adjust the tappet clearance on OHV
engines, the valve stem must be ground.
c. Valve guides can be replaced.
d. If valves are warped they can still be used.

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The basic purpose of a carburetor is to:
a. eqaulize atmospheric pressure
b. clean the air entering the engine
c. regulate the amount of fuel entering the engine
d. regulate the mixture of air and fuel

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The ideal air to fuel ratio by weight for a small engine is:
a. 10:1
b. 15:1
c. 20:1
d. 25:1

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A flexible piece in the carburetor that pulsates when a vacuum is created in the engine and draws fuel into a
chamber of the carburetor is called a:
a. venturi
b. diaphragm
c. spring
d. float

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Which part of the carburetor controls engine speed?
a. throttle
b. venturi
c. choke
d. float

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Gum deposits which clog the carburetor and other fuel system parts are caused by:
a. overheating
b. stale gasoline
c. inadequate operating speeds
d. stalling

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If black smoke is coming from the exhaust when the engine is operating at 3000 rpm’s, the most probable
cause is:
a. a lean air-fuel mixture
b. an improperly installed breather
c. improper set ignition points
d. a rich high speed air-fuel mixture

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The air-fuel mixture entering a two-stroke cycle engine initially enters the engine through the:
a. intake valve
b. carburetor
c. reed valve
d. intake port

The term which does not represent a type of carburetor found on small gasoline engines is the:
a. nozzle feed
b. float feed
c. suction feed
d. diaphragm

The purpose of the venturi on a carburetor is to:
a. mix the correct amount of fuel and air
b. increase air speed/increase pressure
c. decrease air speed/increase pressure
d. increase air speed/decrease pressure

According to Bernoulli’s scientific principle, as air speed __________, it’s pressure __________.
a. increases, decreases
b. increases, increases
c. decreases, is reduced
d. decreases, decreases

The air-fuel mixture is forced into the intake manifold by ____________.
a. increased pressure
b. throttle acceleration
c. atmospheric pressure
d. emulsion tubes

Which of the following is not a basic type of carburetor?
a. natural draft or side draft
b. updraft
c. downdraft
d. angled draft

The purpose of the carburetor float is to:
a. increase pressure
b. keep a tight seal in the carburetor
c. maintain a constant level of fuel in the
float bowl.
d. decrease pressure in the venturi

The needle valve in the carburetor float bowl has a needle point that can be of which two types?
a. neoprene or stainless steel
b. neoprene or brass
c. plastic or brass
d. plastic or stainless steel

The carburetor float can be made of which two types?
a. neoprene or stainless steel
b. neoprene or brass
c. plastic or brass
d. plastic or stainless steel

A round disc mounted on a shaft located at the intake end of the carburetor is called a:
a. throttle
b. filter
c. choke
d. venturi

A round disc mounted on a shaft in a carburetor that is located beyond the main fuel nozzle is called a/an:
a. throttle
b. adjusting needle
c. choke
d. venturi

Which part of the carburetor is responsible for regulating the amount of air-fuel mixture entering the
combustion chamber?
a. float
b. venturi
c. choke
d. throttle

When the choke on a carburetor is closed it provides:
a. a lean air-fuel mixture
b. a rich air-fuel mixture
c. more air flow
d. a smoother running engine

The purpose of a choke on a carburetor is:
a. to provide more air for the engine.
b. to make it run at higher rpm’s.
c. to increase the life of the engine.
d. to make it easier to crank a cold engine.

Carburetors that are nonadjustable are equipped with a _____ jet.
a. narrow
b. fixed
c. wide
d. closed

On carburetors that have adjustments, the initial carburetor adjustment of the needle valve adjusting screw
should be:
a. closed and not adjusted again
b. open all the way
c. open 1 1/2 turns
d. it doesn’t matter

The __________ is a hand-operated plunger, which, when depressed, forces additional fuel through the main
nozzle prior to starting a cold engine.
a. diaphragm
b. welch plug
c. breather
d. primer

When the load on the engine increases, the __________ automatically opens the throttle valve to allow more
air-fuel mixture to enter the engine.
a. carburetor
b. breather
c. choke
d. governor

The purpose of a small engine’s governor is to prevent:
a. variations of low idle speeds.
b. increasing power output under load
c. overspeeding and underspeeding
d. overloading and flooding

Most governors on Briggs & Stratton engines are of two types:
a. mechanical and flyweight type
b. mechanical and centrifugal type
c. air vane and pneumatic
d. mechanical and pneumatic

Which type governor works off of centrifugal force?
a. mechanical
b. air vane
c. pneumatic
d. diaphragm

Which type governor works off of flyweights?
a. mechanical
b. air vane
c. pneumatic
d. diaphragm

Which type governor has a movable air vane that moves based upon the air pressure around the spinning
flywheel?
a. mechanical
b. flyweight type
c. pneumatic
d. diaphragm

The part of the engine that connects the air vane governor to the throttle shaft lever is called the:
a. linkage
b. coil
c. tappet
d. throttle body

The __________ in a governor system on an engine is designed to pull the throttle valve to wide open
position.
a. shaft
b. spring
c. flyweights
d. gears

On lawn mowers, the __________ is a factor on how the governor should be adjusted.
a. type of gas used
b. compression ratio
c. type of carburetor
d. length of blade

The engine speeds up and the governor responds, the engine speed drops and the governor stops functioning.
The engine speeds up again and the governor responds again. When this action is repeated over and over, it
is known as:
a. working properly
b. hunting
c. governing
d. weighting

The recommended cleaning interval for a single element air cleaner for small engines is every:
a. 25 hours of operation
b. 50 hours of operation
c. 100 hours of operation
d. week

A foam air cleaner should be cleaned using:
a. kerosene
b. liquid detergent and water
c. gasoline
d. either a or b

A dual element filter has a ________ type filter as the pre-cleaner.
a. neoprene
b. foam
c. paper
d. cartridge

Single element ________ filters should be oiled to help catch dust particles better.
a. neoprene
b. foam
c. paper
d. cartridge

Paper air filter cartridges should be cleaned by:
a. washing in liquid detergent and water
b. washing in kerosene
c. tapping lightly on a hard surface
d. using compressed air

When installing a paper air filter cartridge, the paper side of the element should face __________ the engine.
a. away from
b. toward
c. inside
d. it doesn’t matter

The primary purpose of the ignition system is to:
a. provide a spark at the spark plug.
b. make the flywheel turn faster.
c. get a better flow of fuel to the cylinder.
d. make it easier to crank in cold weather.

Most small engines use the __________ system to supply ignition spark.
a. fuel
b. conductor
c. power
d. magneto

Which of the following is a basic part of the magneto system?
a. governor
b. carburetor
c. permanent magnets
d. tappets

Which of the following is a basic part of the magneto system?
a. clutch assembly
b. high tension coil
c. needle valve adjusting screw
d. camshaft

Which of the following is not a basic part of the magneto system?
a. mechanical governor
b. spark plug
c. high tension spark plug wire
d. condensor

The “stop switch” grounds the:
a. battery
b. carburetor switch
c. ignition system, stopping the engine
d. none of the above

An instrument for measuring only the voltage in an electrical circuit is called a:
a. voltmeter
b. volt charger
c. magneto tester
d. multimeter

Which of the following is a measure of the resistance to electron flow?
a. power
b. ohms
c. voltage
d. ampere

Which of the following is a measure of the number of electrons flowng past any given point in a specific
length of time? In other words, it is the rate of electron flow.
a. power
b. ohms
c. voltage
d. ampere

Which of the following is a measure of electrical pressure?
a. power
b. ohms
c. voltage
d. ampere

Substances that have electrons which can move freely from atom to atom are said to be good:
a. insulators
b. nonconductors
c. conductors
d. none of the above

An atom consists of:
a. neutrons, electrons and protons
b. neutrons, bata-trons and protons
c. neutrons, electrons, and alpha-trons
d. nerotrons, electrons and protons

The part of the magneto ignition system which converts low voltage into high voltage is the:
a. coil
b. condenser
c. breaker points
d. spark plug

The ignition coil used in a magneto system operates like a:
a. spark plug
b. rectifier
c. transformer
d. diode

The coil steps up the __________ and decreases the __________.
a. amperage, voltage
b. voltage, amperage
c. voltage, wattage
d. output, input

What happens when a coil of wire is passed through a magnetic field?
a. nothing
b. produces static electricity
c. produces current flow
d. produces a spark

Secondary voltage in a small engine ignition system can be as high as:
a. 10,000 volts
b. 20,000 volts
c. 30,000 volts
d. 60,000 volts

The primary winding in the ignition coil has:
a. many turns of heavy wire
b. few turns of heavy wire
c. many turns of fine wire
d. few turns of fine wire

The secondary winding in the ignition coil has:
a. many turns of heavy wire
b. few turns of heavy wire
c. many turns of fine wire
d. few turns of fine wire

Spark plug deposits can be caused by:
a. improper carburetor adjustments
b. incorrect gas and oil mixture in 2 stroke
cycle engines
c. both a and b
d. neither a nor b

The condition of the __________ determines the amount of voltage needed that the ignition system must
produce.
a. crankshaft
b. piston rings
c. carburetor
d. spark plug

The proper spark plug gap for most small engines is:
a. .02”
b. .03”
c. .04”
d. it doesn’t matter

When measuring the spark plug gap, a __________ should be used.
a. flat feeler gauge
b. wire or round feeler gauge
c. vernier caliper
d. micrometer

A four-cycle engine runs at 3600 rpm’s. The number of sparks per minute required at the spark plug would
be:
a. 900
b. 1800
c. 3600
d. 7200

A two-cycle engine runs at 3600 rpm’s. The number of sparks per minute required at the spark plug would
be:
a. 900
b. 1800
c. 3600
d. 7200

Which of the following is true about spark plugs?
a. They come in different types and sizes
b. It doesn’t matter which type you use.
c. They are all 2 1/2 inches long.
d. None of these are true.

Which of the following is a part of a spark plug?
a. tappet
b. primary windings
c. electrode
d. core

Which of the following is a part of a spark plug?
a. terminal nut
b. secondary windings
c. metal needle
d. high tension lead connector

Which of the following is a part of a spark plug?
a. magneto
b. lobes
c. armature
d. ribs

The spark plug insulator is usually a __________ material.
a. plastic
b. fiberglass
c. ceramic
d. brass

Caused by moisture or dirt, __________ is the tendency for current to travel down the outside of the spark
plug instead of traveling through the center.
a. outside spark
b. flashover
c. flashback
d. flashdown

What are the two types of high tension lead connections?
a. round type and square type
b. long type and short type
c. wide type and narrow type
d. exposed clip type and boot type

Spark plug ________ is determined by the thickness of the cylinder head.
a. reach
b. thickness
c. material
d. voltage

The ____________ is the hottest part of the spark plug.
a. center electrode
b. tip of the insulator
c. threaded end
d. outside shell

Spark plugs are manufactured in various heat ranges from __________ to__________.
a. 100 degrees to 200 degrees
b. 200 degrees to 400 degrees
c. 400 degrees to 1,000 degrees
d. hot to cold

Spark plug heat transfer is controlled by the length of the __________.
a. insulator nose
b. center electrode
c. high tension lead
d. coil wire

The operating temperature of spark plugs can be studied with a special spark plug having a ____________
installed in it.
a. thermometer
b. voltmeter
c. spark tester
d. thermocouple

Spark plugs can have different types of electrode configurations. They are:
a. inside gap, surface gap, clipped gap and
automotive gap
b. retracted gap, outside gap, clipped gap and
automotive gap
c. retracted gap, surface gap, clipped gap and
automotive gap
d. retracted gap, surface gap, clipped gap and
straight gap

On engines that have breaker points, opening the breaker points in the ignition system:
a. reverses the micro farads in the primary
circuit.
b. builds up the magnetic field.
c. controls the engine speed.
d. stops the flow of current in the primary
circuit.

On engines that have breaker points, the storage capacity of the condenser is measured in:
a. ohms
b. volts
c. amps
d. microfarads

The proper breaker point gap is:
a. .02”
b. .03”
c. .04”
d. it doesn’t matter

The breaker point assembly is an electrical ___________.
a. meter
b. switch
c. sensor
d. diode

The spark plug fires only at the instant the breaker points ________.
a. open
b. close
c. turn
d. flash

Which type of ignition system replaced the breaker points igniton system:
a. spark plug ignition system
b. solid state ignition system
c. mechanical ignition system
d. power ignition system

One of the advantages of a solid state ingnition system over the breaker point system is:
a. The engine can be used at any angle.
b. The coil can be turned in any direction.
c. Any type spark plug can be used.
d. There are no moving parts.

Which of the following is not an advantage of a solid state ignition system over the breaker point system?
a. increased spark plug life
b. can use any type of gas
c. higher spark output
d. improved idling

Which of the following is not an advantage of a solid state ignition system over the breaker point system?
a. less maintenance
b. easier starting
c. increased carburetor life
d. provides smoother power under load

What closes the breaker points?
a. cam lobes
b. linkage
c. crankshaft
d. a spring

The space between the flywheel and the armature is known as the __________.
a. flywheel gap
b. coil gap
c. air gap
d. ignition space

Some small engine applications use a:
a. battery ignition system
b. capacitor discharge ignition system
c. electronic ignition system
d. all of the above

A typical 12 volt battery will have _____ cells
a. 24
b. 12
c. 6
d. 4

Oil viscosity is a measure of:
a. the ability to flow quickly
b. the detergents
c. the resistance to flow
d. the type of service

Which of the following grades of oil is the thickest?
a. SAE 5W-20
b. SAE 5W-30
c. SAE 10W-30
d. SAE 10W-40

Most small engine manufacturers recommend __________ for temperatures above 40 degrees.
a. SAE 20
b. SAE 30
c. SAE 5W-20
d. SAE 5W-30

Most small engine manufacturers recommend __________ for temperatures below 40 degrees.
a. SAE 0W-40
b. SAE 5W-40
c. SAE 10W-40
d. SAE 5W-30

SAE stands for:
a. Service Automotive Engines
b. Service American Engines
c. Society of American Engineers
d. Society of Automotive Engineers

API stands for:
a. American Part Institute
b. Automotive Part Institute
c. American Petroleum Institute
d. Automotive Petroleum Institute

The “W” in 10W-30 stands for:
a. winter
b. weight
c. way
d. weather

The API classification system for oils is divided into which two categories?
a. “C” and “S” categories
b. “C” and “K” categories
c. “C1” and “C2” categories
d. “S1” and “S2” categories

The API rating certifies that engine oil meets:
a. a certain temperature.
b. a certain weight.
c. a certain viscosity grade.
d. certain quality and performance standards.

An oil container will have certain types of information printed on the label by the manufacturer. Which of
the following will not be found on the label by the manuafacturer.
a. price
b. brand name
c. SAE viscosity grade
d. API rating

API ratings do not apply to which type of engine?
a. 4 stroke cycle engines
b. 2 stroke cycle engines
c. automobiles
d. diesel engines

Higher viscosity oils are recommended for __________ temperatures.
a. lower
b. higher
c. average
d. any

Multi-viscosity oils should be used in:
a. 2 stroke cycle engines
b. some 4 stroke cycle small engines
c. automobiles
d. both b and c

When changing engine oil:
a. run the engine to warm the oil.
b. stop the engine and disconnect the spark
plug.
c. both a and b
d. b only

Oil consumption is greater in a:
a. 2 stroke cycle engine
b. 4 stroke cycle engine
c. it’s the same in both
d. there is no way to tell

Which of the following is not a function of lubricating a small engine?
a. Oil prevents corrosion and cleans an engine.
b. Oil reduces heat by reducing friction.
c. Oil helps seal piston rings to help prevent blow-by.
d. Oil produces friction which decreases power output.

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Small Engines Test bank A Flashcards

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