1. What does a moist compression test, take a look at for?
Burned valve could display no change in compression.
A leaking/worn piston could have a few trade in compression.
What most probably is the motive if the compression does not go up throughout a wet
compression test?
A, burnt valve.
B, worn piston ring.
A
What most probably is the purpose if the compression is going up all through a wet compression
check?
A, burnt valve.
B, worn piston ring.
B
2. Blue smoke is coming from the exhaust pipe of a automobile, what maximum probably is the
motive?
A, worn piston ring.
B, horrific head gasket.
A
three. A vacuum guage is hooked up to the consumption manifold of an engine and the engine
is administered at 2000 rpm. During the check, the pointer on the guage fluctuates hastily
among readings of 10 and 20 inches of vacuum. These take a look at consequences point to:
A, a leaking consumption manifold.
B, worn piston rings.
C, worn valve courses.
D, every week or damaged valve spring.
D, a susceptible or damaged valve spring could reason a vacuum guage to vary or leap from
excessive to low readings.
,Four. Engine detonation (knock) may be because of any of the following Except:
A. A lean air/fuel combination
B. Retarded ignition timing
C. Excess carbon inside the the combustion chambers
D. A caught-closed EGR valve
B. Advanced ignition timing will purpose a knock, but retarded timing will no longer.
Five. A automobile with electronic ignition hesitates and stumbles in the course of acceleration.
The trouble is going away while the vacuum increase hose is disconnected and plugged.
Technician A says that a caught vacuum boost mechanism could be the reason. Technician B
says that an intermittent open in the pickup coil leads could be the cause. Who is proper?
A. Technician A simplest
B. Technician B simplest
C. Both A and b
D. Neither A or B
B. If a vacuum enhance mechanism were stuck, the hassle would no longer exchange if the
vacuum hose is hooked up or disconnected. When the vacuum adjustments to the vacuum
develop mechanism and the distributor plate actions, this may circulate the wires to the pick
out-up causing a quick or open which could purpose the choose-up sign to be misplaced
momentarily.
6. Technician A says that spark enhance on and engine may be examined through being
attentive to the manner the engine sounds at better rpms. Technician B says that spark increase
on an engine can be examined with a timing mild that contains an ignition improve meter. Who
is right.
A. Technician A best
B. Technician B most effective
C. Both A and B
D. Nether A or B
B. To correctly measure spark strengthen use a timing mild. The spark improve cannon be
determined by using taking note of the manner the engine sounds.
7. A regular consumer presents his car for carrier. He describes signs of bad pressure capability
and says that the car has been repaired for the equal trouble in the beyond. Which of the
subsequent you need to do first?
A. Join the car to an engine analyzer
B. Test for diagnostic trouble codes.
C. Test the automobile provider history and test for TSBs, provider campaigns and recalls
D. Carry out a cylinder stability check
, C. Checking car provider history would factor you in the right route.
Eight. Two Technicians are listening to a tapping noise coming from the pinnacle cease of a v8
engine. Technician A says the noise may be a valve wanting adjustment. Technician B says the
the noise will be an exhaust leak. Who's is right?
A. Technician A most effective.
B. Technician B best
C. Both A and B
D. Neither A or B
C. A tapping noise that does not leave after engine warm up might be as a result of worn
valvetrain components or excessive valvetrain clearance. A similar kind of noise might be
purpose by way of and exhaust leaks the exhaust manifold/cylinder head junction.
Nine. Technician A says a excessive spike line on an oscilloscope indicates a disconnected or
open plug cord. Technician B says a excessive spike line on an oscilloscope suggests a closed
gap on a spark plug. Who is right?
A. Technician A most effective
B. Technician B best
C. Both A and B
D. Neither A or B
A. If a spark plug gap were closed, the oscilloscope might imply a very low spike line.
10. A automobile can be commenced with extraordinary difficulty, however lacks energy, and
could not idle. Technician A says says that there may be hole or a tear in the duct between the
mass air flow sensor and the throttle frame. Technician B says that a restrained fuel clear out is
the hassle. Who is proper?
A. Technician A most effective
B. Technician B only
C. Both A and B
D. Neither A or B
A. A gas filter would no longer be the purpose of the hassle
11. A car is towed in with a 'crank however might not start' situation. A 'noid' mild take a look at
finds no injector pulses, and Technician A says a automobile wishes a laptop. Technition B
reveals no spark, and says the vehicle needs an ignition module. Who is right?
A. Technician A handiest
B. Technician B simplest
C. Both A and B
D. Neither A or B
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