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WorksheetsWeekly Quiz Engine performance 3/25/2022
Total questions: 20
Worksheet time: 10mins
For a 8-cylinder engine,a good vacuum reading should read as a
fluctuating needle between 10 to 14 in. mercury
fluctuating needle between 10 to 14 in of water
Steady needle between 10 to 14 in of water
Steady needle between 10 to 14 in of mercury
A fuel injected engine vehicle that has a high or surging idle most likely has
water in the gas
a clogged air filter
a vacuum leak
a locked up converter clutch
While performing an unrelated repair,a technician observes black smoke from the vehicles exhaust. The technician should recommend.
different gasoline
an oil pressure test
further diagnostics
a muffler replacement
After performing a dry compression test and then a wet compression test,the reading on one engine cylinder reads 85 psi dry and 120 psi wet. This usually indicates
a leaking head gasket
worn valve guides
worn piston rings
burned valves
If the spark plug porcelain is blistered,the spark plug
gap is too narrow
heat range is to cold
heat range is too hot
gap is to wide
Plugs that have a black shiny appearance on the electrodes indicate a/an
improper plug heat range
oil-fouled plug
excessive rich mixture
coolant fouled plug
The vertical axis on the oscilloscope screen represents
omhs
amperage
voltage
time
The purpose of a ignition coil is to
lower the ignition system draw
reduce battery voltage
increase the amperage at the plugs
step up the voltage to fire the plugs
The waste spark ignition system will fire
two plugs at different times
one plug at a time
two plugs at the same time
three plugs at the same time on a V-6 engine
A partially collapsed exhaust pipe will cause a a/an
lean running condition
low power condition
engine to run cooler
engine to have higher compresion
While monitoring fuel pressure,the specification is 35 to 40 psi and the reading is 60 psi. what could be the problem
injectors are not opening
fuel pump outlet check valve is stuck closed
there is a restriction in the fuel return line
the fuel pressure regulator is stuck open
Most fuel pressure regulators increase fuel pressure as
the vacuum decreases
oil pressure increases
the vacuum increases
oil pressure decreases
A partially restricted catalytic converter might cause
a lean condition
low engine power
lower running temperature
higher engine compression
If the EGR valve is stuck slightly open,theengine idle will most likely be
high
unchanged
rough
smooth
A leaky exhaust system could cause
engine overheating
excessive emission
early fuel evaporation
low oil pressure
Three-way catalytic converters contain which three precious metals
rhodium,palladiumand platinum
zinc,platinum and zircon
gold,rhodium and zircon
zinc,rhodium and platinum
The PCV valve
is a separating device
provides a metered air flow for the crankcase venting
can be checked with a hand-held vacuum pump
keeps the manifold cool
Three-way catalytic converters are used to control
CO/HC/NOx
HC/NOx/CO2
HC/CO/CO2
O2/CO/NOx
The catalyst monitor (O2 sensor) is located
in the exhaust manifold
in the crossover pipe
downstream the catalytic converter
upstream the catalytic converter
The exhaust gas recirculation (EGR) system is used to reduce
CO2
NOx
HC
CO
