100+ câu trắc nghiệm Cơ điện tử ô tô có đáp án - Phần 1
25 câu hỏi
As engine rpm increases, the ignition timing must:
Secondary winding Technician A says the battery provides electricity by releasing free electron
Primary winding
Electronic control module (ECM)
Ignition control module
As engine rpm increases, the ignition timing must:
Retard.
Advance
Remain the same
Remain the same and then retard
Which of the following components generates a timing signal for the ignition system?
ECU
Crankshaft position sensor
Rotor
Ignition coil
All of the following components are part of a Distributorless Ignition System (DIS) EXCEPT:
Spark plug
Crankshaft position sensor
Rotor
Ignition coil pack
The HEAT RANGE of a spark plug can be determined by:
Its part number
The number of electrodes
Its length
Its diameter
Which of the following components multiplies battery voltage to create a spark?
Ignition pickup
Ignition wires
Ignition module
Ignition coil
Which of the following can cause changes in Ignition Timing?
Engine RPM
Engine Temperature
Engine Load
Any of the above
If the Crankshaft Position Sensor is not producing a signal, what will happen?
Ignition timing will be RETARDED
The engine computer will substitute a timing signal
There will be no ignition timing
Ignition timing will be ADVANCED
An eight cylinder engine running at 3000 rpm requires sparks per SECOND.
200
300
400
100
In an alternator, alternating current is converted to direct current by the:
Stator
Rectifier
Brushes
Regulator
CDI stands for:
Coil Dual Ignition
Current Direct Ignition
Capacitor Discharged Ignition
Capacitor Direct Ignition
A battery that is overcharged can be due to:
loose alternator drive belt
high speed driving
high resistance in the field circuit
defective regulator
Why is a thermistor used in an alternator regulator?
To control minimum current
To control maximum current
To control maximum voltage
To compensate for temperature change
What does EMF stand for?
Electromagnetic force
Electromotive force
Electronic magnetic force
Electromated force
Most vehicles today use the type of ignition system.
Coil-on-plug
Distributor
Breakerless
Waste spark
The type of ignition system in which two cylinders share one coil is called a:
Coil-on plug ignition system
Distributor ignition system
Waste spark ignition system
None of the above
In an alternator, which component controls the output?
Diode
Cut-out relay
Current regulator
Voltage regulator
The basic purpose of the overrunning clutch in the starter drive is to:
disengage the armature when the engine starts
assist the solenoid during cranking.
keep the hold-in winding energized during cranking
pull the starter pinion gear out of mesh
A solenoid uses two coils. Their windings are called:
push-in and hold-out
push-in and pull-out.
pull-in and hold-in
pull-in and push-out
The distributor serves the following purposes in the ignition system
It increase voltage
both a and b
It distributes high tension current to spark plug at correct time
None of the above
In Magneto Ignition system
No battery is required
used in high speed engines
All of the above
Engine starting is rather difficult
The following is known as ‘Breakerless Ignition system’
Magneto Ignition system
Electronic Ignition system
Battery coil ignition system
Capacitive discharge Ignition system
The discharged lead acid battery has on its plates
Lead peroxide (PbO₂)
Spongy lead (Pb)
Sulphuric acid (H₂SO₄)
Lead sulphate (PbSO₄)
The main task of a battery in automobiles is to
Supply electricity to the vehicle's electrical system at all times while the engine is running
Act as a reservoir or stabilizer of electricity
Supply electricity to the alternator
Supply a large amount of power to turn the starter motor when the engine is cranking
During charging the specific gravity of the electrolyte of a lead acid battery
Remains the same
Becomes zero
Decreases
Increases
