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WorksheetsAnh Văn Chuyên Ngành
Total questions: 58
Worksheet time: 29mins
An engine is a machine for converting energy into motion or ……………… work.
chemical
mechanical
hydraulic
pneumatic
The two basic types of piston engines are the …………………….
rotary and reciprocating
pushrod and reciprocating
gasoline and spark-ignition
spark-ignition and compression-ignition
The differences between the spark-ignition engine and the compression-ignition are: ……………………
the type of fuel used
the way the fuel gets into the cylinder
the way the fuel is ignited
All of the above
Rudolf Diesel, a German engineer, ………………. the diesel engine.
did
make
invented
discovered
All the following are true about diesel engines EXCEPT ………………
no throttle valve
high compression ratio
spark plugs make starting easier
speed and power controlled by quantity of fuel injected
In the diesel or compression-ignition engine, the fuel mixes air ……………. it enters the engine cylinder.
before
after
during
by
The only ……………. engine now used in automobiles is the Wankel engine.
rotary
Sterling
piston
hybrid
The two fuel systems used with spark-ignition engines are: ………………
carbureted and diesel
fuel injection and diesel
port and throttle body
fuel injected and carbureted
Unlike steam engines and turbines, internal-combustion engines develop no torque when starting, and therefore provision must be made for turning the ……………. so that the cycle of operation can begin.
camshaft
crankshaft
driveshaft
gearshaft
Automobile engines are normally started by means of an electric motor or …………. that is geared to the crankshaft with a clutch that automatically disengages the motor after the engine has started.
generator
starter
supercharger
shock absorber
The piston engine produces power by the …………….
rotation of the crankshaft
combustion pressure pushing on pistons
valve action
up-and-down movement of pistons
To change reciprocating motion to rotary, the engine has ……………
a crankshaft and a camshaft
piston and connecting rods
camshafts and connecting rods
connecting rods and a crankshaft
In all engines some means of igniting the fuel in the cylinder is provided, and …………. the heat of combustion, all engines are equipped with some type of cooling system.
although
where
since
because of
The three basic cylinder arrangements for automotive engines are ………….
flat, radial, V
in a row, in-line, opposed
in-line, V, opposed
V, double line, opposed
An engine with the camshaft in the block operates the valve through …………….
valve lifters
pushrods
rocker arms
All of above
As the piston moves up the cylinder, the air-fuel mixture is compressed and the …………….
temperature increases
pressure increases
air-fuel mixture gets hot
All of above
At the moment of explosion, the temperature within the cylinder is extremely high. Cylinders are therefore provided with …………., through which water is rapidly circulated.
guards
coats
jackets
sumps
During combustion of gasoline in the engine ……….
hydrogen unites with oxygen to form water
oxygen unites with carbon to form carbon dioxide
some carbon unites with oxygen to form carbon monoxide
All of above
During the …………. stroke, the high pressure created by the burning mixture forces the piston downward.
intake
compression
power
exhaust
The two kinds of piston rings are ………...
pressure and sealing
oil-scraper and blowby
snap and sealing
compression and oil control
The ignition system performs all the following jobs EXCEPT ……….
controls the compression pressure
produces the spark that jumps the spark-plug gap
ignites the compressed air-fuel mixture
delivers the spark at the proper time
Piston rings installed upside down may cause ……………
excess oil consumption
broken piston lands
rapid cylinder-wall wear
overheating
There are two basic types of internal combustion engines: …………….
piston and reciprocating
reciprocating and rotary
reciprocating and pushrod
rotary and spark-ignition
A piston stroke is a piston movement from …………
BDC to TDC
TDC to BDC
both A and B
neither A nor B
The correct order in which the four piston strokes occur in the engine is ……………
intake, compression, power, exhaust
intake, power, compression, exhaust
compression, power, intake, exhaust
exhaust, compression, intake, power
Most devices on the car are powered by …………….
the engine
electricity
electronics
vacuum
The volume that the piston displaces as it moves from BDC to TDC is the ……….
compression stroke
compression rate
volumetric efficiency
piston displacement
The primary purpose of the ………… is to prove inertia to keep the crankshaft rotating during the three no-power-producing strokes of the piston.
flywheel
steering wheel
piston
cylinder
From the clutch the power flows through the …………. in one of several speeds and is delivered into the rear-axle drive gears.
flywheel
springs
transmission
stabilizers
Flexible coupling, called universal joints, allows the rear axle housing and the wheels to move up and down while the transmission remains …………….
stationary
moving
rotary
reciprocating
The drive shaft is used on front-engine, rear wheel drive vehicles to couple the transmission output shaft to the …………… input shaft.
clutch
suspension
wheel
differential
The primary purpose of the ………… system is to isolate the car body from the vertical motion of the wheel as they travel over the rough road surface.
steering
transmission
suspension
ignition
Similar to the …………., the shock absorbers also produce a force that acts to support the weight of the car.
gears
springs
rings
rods
The shock absorber consists of a cylinder and piston assembly. The cylinder is filled with viscous ………
oil
gasoline
diesel
water
Most of the …………. energy of the car is dissipated by the brakes during deceleration and stopping.
electrical
chemical
kinetic
lighting
The braking force that decelerates the car results from …………. between the disk and the pads.
corrosion
friction
wear
erosion
The braking force that decelerates the car results from …………. between the disk and the pads.
corrosion
friction
wear
erosion
Steering functions by rotating the plane of the ……….wheels in the desired direction of the turn.
rear
back
front
none is correct
One of the purposes of the …………. is to allow each drive wheel to turn at a different speed.
transmission
brakes
drive train
differential
All have the property that the deflection of the spring is known ………….the spring rate.
as
than
so
such
Under the normal driving conditions, the brakes ………. in contact with the disk, and the disk is free to rotate.
cannot
do not
are not
can not
All the following provide different gear ratios EXCEPT
manual transmission
automatic transaxle
manual transaxle
clutch
In an electronic control system, the devices that provide information are ………
sensors
outputs
actuators
control units
Which of these statements about a closed container is correct?
temperature increases with increasing pressure
pressure increases with increasing temperature
both A and B
neither A nor B
The firing order is the ……….
order in which the cylinders are numbered
sequence in which the cylinders deliver their power strokes
direction in which the crankshaft rotates
sequence in which the connecting rods attach along the crankshaft
The camshaft is driven by sprockets and chain or toothed belt or by
the distributor shaft
an oil-pump gear
timing gears
a timing belt
Valve overlap is the number of degrees of crankshaft rotation during which
both intake and exhaust valves are closed
both intake and exhaust valves are open
the valves are moving from fully closed to the timing point
the valves float
The two fuel systems used with spark-ignition engines are
carbureted and diesel
fuel injection and diesel
port and throttle body
fuel injected and carbureted
The two locations for the fuel injectors are
in the cylinder and on the intake manifold
in the throttle body and in the intake ports
on the two sides of the air horn
in the intake manifold and in the exhaust manifold
All the following are true about diesel engines EXCEPT
no throttle valve
high compression ratio
speed and power controlled by quantity of fuel injected
spark plugs make starting easier
The device that provides spark advance by pushing the breaker cam ahead as engine speed increases is the
vacuum advance mechanism
throttle body
primary resistance
centrifugal advance mechanism
In the electronic ignition system, the primary circuit is opened and closed by……..
a solenoid
contact points
a mechanism switch
an electronic switch
When the gear ratio through the transmission is 1: 1, the transmission is in
overdrive
direct drive
underdrive
neutral
In a rear-wheel-drive vehicle, when the rear wheels move up and down
the drive line changes length
the angle of drive changes
both A and B
neither A nor B
The purpose of the glow plug is to
control engine idle speed
provide sparks to ignite the compressed air-fuel mixture
warm the fuel
add heat to the precombustion chamber
In electronic ignition systems, the ………… are replaced by a switch.
differential
breaker points
distributor
piston
A …….. having a number of lobes equal to the number of cylinders is mounted on the distributor shaft.
spark plug
cam
ring
spring
The cylinder head forms the upper end of the combustion chamber. The lower end is formed by the ……….
Piston
Compression ring
Spark plug
Valve
