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WorksheetsArbuckle Small Engine Theory Multi-choice (part 2)
Total questions: 40
Worksheet time: 20mins
When does TDC valve overlap occur
At TDC between the exhaust and intake strokes
At BDC between the power and exhaust strokes
At TBC between the compression and power strokes
None of the above
At which stoke should the valves be adjusted?
AT TDC between the exhaust and intake strokes
AT BDC between the power and intake strokes
At TDC between the compression and power strokes
None of the above
The function of the choke is to richen the air fuel mix by
Adding more air fuel to the mix
Reducing the amount of air into the mix
Adding more fuel into the mix
Reducing the fuel into the mix
The function of the main jet air and fuel nozzle is
To lower atmospheric pressure into the carburator
To premix air with fuel in the nozzle to aid atomization
As a fuel enrichment device
Allow fuel into the float bowl
The process of breaking gasoline into tiny droplets and mixing it with air is called
scavenging
compressing
atomizing
transferring
The __ plate is a round movable disk that pivots on a shaft, regulating air and fuel flow inside the carburator
A. Choke
B. Throttle
C. Either A or B
D. Neither A or B
In a venturi __
Air pressure is greatest where velocity is greatest
Air pressure is least where velocity is greatest
Velocity is least where air pressure is greatest
The volume of air entering is slighty greater than the air leaving due to the restriction of flow
Gasoline should
Vaporize easily
Be free from dirt and water
Fast burning
All of the above
High octane gas is
Fast burning
Slow burning
Cheap gas
None of the above
The governor of an engine adjusts the __ to compensate for changing speed or loads
throttle opening
ignition timing
air-fuel ratio
none of the above
Type B fire extinguishers are designed to use on
Flammable liquids
electrical equipment
ordinary combustibles
none of the above
Torque specifications are often given in __
in inch-pounds (in-lb)
in foot-pounds (ft-lb)
for critical parts
all of the above
The purpose of the governor is to
maintain a constant engine RPM with varying loads
maintain idle RPM
choke the engine for startup
seal the valves
The governor controls
high idle mix
low idle mix
high speed mix
oil flow
Blue smoke is coming out of the exhaust. This is most likely caused by
too rich of a fuel mixture
carburetor float improperly set
worn piston rings
plugged cooling fins
too lean of a fuel mixture
Piston ring end gap is measured with a
plastigauge
pressure gauge
plug measure
feeler gauge
card gauge
What tool is used to remove the unworn portion at the top of the cylinder so the piston can be removed
bead plastor
cylinder boring tool
ridge reamer
cylinder honing tool
To properly install a piston assembly into a cylinder block, you should use
A ring expander
WD-40 and oil
a small hammer
A C-clamp
a ring compressor
A crankshaft from a single cylinder has __ bearing surfaces
6
5
4
3
it has journals not bearings
Pre-ignition can be caused by
an overly rich mixture
a hot particle or deposit in the combustion chamber
shutting down a cold engine
over choking
Which piston type would be found in a small gas engine
A
B
C
All of them
Torque is a measurement of
horse power
down force
up force
twisting force
Horse power is a measurement of
work being done
torque being produced
pressure being created
RPMs an engine is run at
Cylinder bore is a measurement of the cylinder's
radius
diameter
depth
circumference
The proper sequence of events in a 4-stroke engine is
compression, exhaust, intake, power
compression, intake, power, exhaust
intake, compression, power, exhaust
intake, compression, exhaust, power
The advantages of overhead valves are that they
improve volumetric efficiency
eliminate combustion chamber hot spots
increase fuel efficiency
improve engine service life
all of the above
The average temperature of the burned gas in the combustion chamber is
2400 degrees F (1315.5 degrees C)
3000 degrees F (1649 degrees C)
6200 degrees F (3227 degrees C)
3600 degrees F ( 1982 degrees C)
a 130302 briggs and stratton model series engine has a displacement of
2 cubic inches
3 cubic inches
13 cubic inches
30 cubic inches
The crankshaft changes
rotary motion into reciprocating motion
reciprocating motion into rotary motion
reciprocating motion into torque motion
rotary motion into torque motion
The telescope gauge is used to measure the
depth of a bore
diameter of a bore
outside diameter of a cylinder part
all of the above
CARB stands for
Community Air Reclamation Board
California Air Resource Board
short for carburetor
Clean Air Resource Board
The exhaust gas produced by a running engine is
hydrogen dioxide
carbon monoxide
carbon dioxide
oxygen monoxide
Which of the following should never be used as a solvent
Gasoline
Kerosene
Varsol
Water
The acronym OSHA stands for
Organizational Safety Honor Association
Occupational Safety and Health Administration
Organization of Shop Health in America
Ocular Safety Handbook Annual
The EPA stand for
Environmental Protection Agency
Emissions Protection Agency
Energy Producing Association
Enterprise protection Agency
Class A fires are classified as
Flammable liquids
Combustible metals
Electrical equipment
Ordinary combustibles
The flash point of a liquid is the
highest temperature at which a liquid gives off sufficient vapors to ignite
The point at which liquid fuel will explode
the temperature at which a liquid will change from matter to anti-matter
lowest temperature at which a liquid gives off sufficient vapors to ignite
If the crankshaft gear has 32 teeth, how many teeth does the camshaft have?
8
16
32
64
A fully charged 12-volt lead acid battery will register __ volts on a mulitmeter
12
12.6
13.8
1.236
A source of electricity
has an excess of electrons and is positively charged
has an excess of electrons and is negatively charged
lacks electrons and is negatively charged
lacks electrons and is positively charged
